Entire Temperature Range Research Articles

Dynamic Viscoelastic Behavior of Maize Kernel: Application of Frequency-Temperature Superposition.

Maize kernels were treated using two varieties of drying methodologies, namely combined hot air- and vacuum-drying (HAVD) and natural drying (ND). We performed frequency sweep tests, modified Cole-Cole (MCC) analysis, and frequency-temperature superposition (FTS) on these kernels. The kernels' elastic and viscous properties for ND were higher than those for HAVD. The heterogeneous nature of maize kernel may account for the curvature in MCC plot for the kernel treated by HAVD 75 °C and the failure of FTS. MCC analysis was more sensitive than FTS. The kernel treated by HAVD 75 °C demonstrated thermorheologically simple behavior across the entire temperature range (30-45 °C) in both MCC analysis and FTS. The frequency scale for the kernel treated using HAVD 75 °C was broadened by up to 70,000 Hz. The relaxation processes in the kernel treated by HAVD 75 °C were determined to be mainly associated with subunits of molecules or molecular strands. The data herein could be utilized for maize storage and processing.

Critical enhancement of the spin Hall effect by spin fluctuations

The spin Hall (SH) effect, the conversion of the electric current to the spin current along the transverse direction, relies on the relativistic spin-orbit coupling (SOC). Here, we develop a microscopic theory on the mechanisms of the SH effect in magnetic metals, where itinerant electrons are coupled with localized magnetic moments via the Hund exchange interaction and the SOC. Both antiferromagnetic metals and ferromagnetic metals are considered. It is shown that the SH conductivity can be significantly enhanced by the spin fluctuation when approaching the magnetic transition temperature of both cases. For antiferromagnetic metals, the pure SH effect appears in the entire temperature range, while for ferromagnetic metals, the pure SH effect is expected to be replaced by the anomalous Hall effect below the transition temperature. We discuss possible experimental realizations and the effect of the quantum criticality when the antiferromagnetic transition temperature is tuned to zero temperature.

Towards achieving an ideal convergence of light and heavy electron conduction bands in SnTe: Insights into copper doping

In recent years, tin telluride has garnered significant attention in the field of thermoelectrics, offering a promising avenue for sustainable ecofriendly conversion of waste heat into electricity. The unique electronic structure of this material makes it a compelling candidate for exploring innovative strategies to enhance its transport properties by employing substitutional doping. Among myriad elements doped, copper has been considered an intriguing candidate due to its ability to lower the thermal conductivity. However, its impact on the electronic structure has not been thoroughly explored till date. Herein, we investigate a nuanced aspect of copper doping, specifically focusing on its impact on tuning the electronic structure of SnTe. Significantly, our findings reveal a novel dimension to copper doping, showcasing its potential to enhance n-type performance in SnTe through the near-perfect convergence of its conduction bands - a feature not observed when doped in GeTe. We also shed the light on improvement of the p-type performance by means of valence band convergence and increased band gap. Furthermore, we reveal that copper doping allows the contribution of low-lying bands in SnTe to participate in transport, ensuring a higher Seebeck coefficient across the entire temperature range. Overall, this work provides a panoramic view of role of copper in improving the Seebeck co-efficient of SnTe making it a potential lead-free material for several thermoelectric applications.

Pivotal temperature is not for everyone: Evidence for temperature-dependentsex determination in three gecko species.

The prevalence of environmental sex determination (ESD) in squamate reptiles is often overestimated in the literature. This is surprising because we have reliable data demonstrating ESD in only a few species. The documentation of ESD in three species of geckos presented here has significantly increased our knowledge, given that satisfactory evidence for ESD existed in only eight other gecko species. For the first time, we document the occurrence of ESD in the family Sphaerodactylidae. Our finding of unexpected variability in the shapes of reaction norms among geckos highlights that traditional descriptions using parameters such as pivotal temperature, that is, temperature producing a 50:50 sex ratio, are unsatisfactory. For example, the gecko Pachydactylus tigrinus lacks any pivotal temperature and its sex ratios are strongly female-biased across the entire range of viable temperatures. We argue for the effective capture of the relationship between temperature and sex ratio using specific nonlinear models rather than using classical simplistic descriptions and classifications of reaction norms.

A systematic first-principles investigation of the structural, electronic, optical, thermodynamic and transport properties of lead-free pyrochlore oxides Q2Sb2O7 (Q= Be, Ca, Sr) for low-Cost energy applications

A systematic study has been performed on structural, optical and thermophysical properties of newly designed pyrochlore oxides Q2Sb2O7 (Q = Be, Ca, Sr) employing FP-LAPW based first-principles calculations. The GGA approach was used to treat exchange and correlation potentials. The investigated E-V plots reveals that Sr2Sb2O7 is the most stable structure compared to Be2Sb2O7/Ca2Sb2O7. A direct energy bandgap of 0.29 eV is evident from band structure plot of Be2Sb2O7, however, Ca2Sb2O7/Sr2Sb2O7 possess indirect energy bandgaps of magnitude 1.47/1.467 eV. The studied materials show maximum absorption of incoming photons in near UV region as shown in ε2(ω) plots, however, considerable absorption in visible region is also present. Ca2Sb2O7/Sr2Sb2O7 are effective optical material with a n(ω) value between 1.0 and 2.0. Optical properties of pyrochlore oxides reveal that these materials are potential candidates for shielding materials in upper UV region. A photon reflection of up to 60% is evident from the R(ω) in UV region, however, in IR and visible regions, the reflectance is negligible. Based on calculated values of Seebeck coefficient (S), we can state that Be2Sb2O7 is n-type semiconductor whereas Ca2Sb2O7/Sr2Sb2O7 are p-type semiconductors. The most effective thermoelectric material among Q2Sb2O7 (Q = Be, Ca, Sr) is Ca2Sb2O7 as its ZT value is highest (∼1.05) in the entire temperature range. Thermodynamic properties of Q2Sb2O7 (Q = Be, Ca, Sr) are also evaluated to check dynamical stability and appropriateness of these materials in thermal applications. The investigated outcomes show that these pyrochlore oxides are potential candidates for thermoelectric and optoelectronic device applications.

Design of ultra-efficient and automatically temperature-variable cycle (TVC) Sieverts apparatus for testing sorption properties of hydrogen storage materials

The evaluation of hydrogen sorption properties in materials is crucial for their widespread applications. However, existing volumetric apparatuses often suffer from low accuracy and efficiency due to inadequate calibration techniques, temperature gradients, and limited automation. To address these limitations, a Temperature-Variable Cycle (TVC) Sieverts apparatus has been developed. Besides conventional tests, the device is capable of efficiently performing TVC tests, such as TVC Pressure-Composition-Temperature (PCT) isotherm and kinetics, through the integration of RS485 serial communication and automatic dosing techniques. The instrument's component selection and configuration were described in detail. Furthermore, novel methods for volume calibration and anti-thermal gradient were presented, where a continuous function was proposed to overcome temperature gradients across the entire range of test temperatures. Finally, a series of tests were conducted using La0.5Ce0.5Ni4Co alloy and Mg material as benchmark materials to validate the setup and methods. The accuracy of volumes and the feasibility of the methods were confirmed through null PCT tests and data comparisons of PCT with kinetic of La0.5Ce0.5Ni4Co alloy, respectively. By employing these methods, the accuracy of null tests is improved by nearly tenfold. The efficiency and robustness of the unit were demonstrated through Temperature-Programmed Desorption/Absorption (TPD/TPA), TVC PCT, and TVC kinetics tests on MgH2 powder. The results produced by the TVC system align well with the reliable data in literature.

A coupled electromagnetic and heat transfer model for casket designing for efficient microwave heating: An insight from theoretical analysis, Multiphysics simulation, and experimental investigations

Microwave heating is extensively used in several industries due to its advantageous capabilities such as volumetric heating, reduced processing time and less energy consumption as compared to conventional heating. Refractory casket insulation is primarily used in microwave heating systems for the purposes of insulation and effective microwave transmission. This investigation aims to provide knowledge and insights for selecting suitable high-temperature refractory insulating casket materials, particularly focusing on three different types: dense alumina, dense alumina-silica, and porous alumina-silica casket. The investigation involves evaluating the microwave transmission efficiency (PTC) and insulation resistance capability of the three casket materials concerning their dielectric and thermophysical properties at varying temperatures. Among three casket materials, porous alumina-silica casket showed a significantly lower values of dielectric constant (1.50 to 1.68), loss tangent (0.000086–0.00318) and thermal conductivity (0.26 W/m·K to 0.50 W/m·K) over the entire temperature range. Consequently, the porous alumina-silica casket exhibited superior insulation and PTC (0.9997 to 0.9876) during microwave heating. The heating phenomenon of each casket material has been established. The COMSOL Multiphysics model was used to analyze the microwave heating behavior of SiC susceptor with varying casket composition and geometry under similar parameters for the first time. A higher heating rate was observed by COMSOL simulation for the porous alumina-silica (58.8 °C/ min) casket than dense alumina-silica (22.31 °C/ min) and dense alumina (9.63 °C/min) casket during microwave heating of SiC susceptor at 1200 W, 1500 s. The COMSOL simulation data were corroborated with experimental results. The study serves a general guideline to select an appropriate casket material for any microwave processing.

All-Perovskite Multicomponent Nanocrystal Superlattices.

Nanocrystal superlattices (NC SLs) have long been sought as promising metamaterials, with nanoscale-engineered properties arising from collective and synergistic effects among the constituent building blocks. Lead halide perovskite (LHP) NCs come across as outstanding candidates for SL design, as they demonstrate collective light emission, known as superfluorescence, in single- and multicomponent SLs. Thus far, LHP NCs have only been assembled in single-component SLs or coassembled with dielectric NC building blocks acting solely as spacers between luminescent NCs. Here, we report the formation of multicomponent LHP NC-only SLs, i.e., using only CsPbBr3 NCs of different sizes as building blocks. The structural diversity of the obtained SLs encompasses the ABO6, ABO3, and NaCl structure types, all of which contain orientationally and positionally locked NCs. For the selected model system, the ABO6-type SL, we observed efficient NC coupling and Förster-like energy transfer from strongly confined 5.3 nm CsPbBr3 NCs to weakly confined 17.6 nm CsPbBr3 NCs, along with characteristic superfluorescence features at cryogenic temperatures. Spatiotemporal exciton dynamics measurements reveal that binary SLs exhibit enhanced exciton diffusivity compared to single-component NC assemblies across the entire temperature range (from 5 to 298 K). The observed coherent and incoherent NC coupling and controllable excitonic transport within the solid NC SLs hold promise for applications in quantum optoelectronic devices.

An investigation into the thermal rectification in one-dimensional asymmetric systems

The thermal rectification phenomenon in a one-dimensional asymmetric system of two thin films with different temperature-dependent thermal conductivities is studied. Based on the traditional thermal diffusion equation, the optimization condition for maximizing the thermal rectification ratio is re-examined; a new sufficient condition is found that the interface temperatures in the forward and reverse heat transfer directions should be equal, regardless of how the thermal conductivities depend on temperature. In other words, the thermal rectification ratio is maximized when the temperature dependence of the thermal conductivity over the entire operating temperature range is fully exploited. This sufficient condition can be used to find out the optimal geometric parameters of nanostructures which determine the effective thermal conductivity. An illustration of an asymmetric system composed of monolayer graphene sheet (GS) and graphene nanomesh (GNM) is presented. This study is beneficial to the development of thermal devices such as thermal resistors, thermal diodes, and thermal logic circuits.

Excellent low-temperature toughness of 1 GPa grade microlaminated 5Mn steel containing retained austenite

The development of high-strength steels with excellent low-temperature toughness continues to present significant challenges. Delamination toughening and retained austenite (RA) toughening are effective methods for improving the low-temperature toughness of steels. In the present study, medium manganese steel with a microlaminated microstructure containing blocky RA is prepared by intercritical rolling (IR). A comparative steel with a microstructure containing annealed martensite and film-like and blocky RA is generated by hot rolling and intercritical annealing (HRIA). The different microstructure morphologies lead to different fracture characteristics. The IR steel plate exhibited a delaminated fracture that changes the crack propagation path, inducing large-scale and severe plastic deformation in the area below the delaminated crack in the entire temperature range (RT ∼ −196 °C). The Charpy impact V-notch absorbed energy (CVN) is as high as 450 ± 7 J at −60 °C. Moreover, the fracture behavior of the HRIA steel was similar to that of steels with equiaxed microstructures; ductile fracture takes place (above −40 °C) first, followed by brittle fracture, and the CVN is only 150 ± 83 J at −60 °C. The RA contents of the IR and HRIA steels at RT are 25.8% and 22.3%, respectively. Upon impact at −60 °C, the RA content becomes 0 and 4% in the IR and HRIA steels, respectively. Finally, a toughening mechanism is established for IR steel from the perspectives of crack propagation and microstructure evolution.

Mechanical Properties of Thermally Annealed Cu/Ni and Cu/Al Multilayer Thin Films: Solid Solution vs. Intermetallic Strengthening

In this study, Cu/Ni and Cu/Al multilayers, with individual layer thickness varying from 25 nm to 200 nm, and co-sputtered Cu-Ni and Cu-Al single layer films were deposited at room temperature via magnetron sputtering and further annealed from 100 °C to 300 °C. The mechanical and microstructural properties of the as-deposited and annealed samples were characterized by nanoindentation, x-ray diffraction, and scanning electron microscopy. Both multilayer systems exhibit an increase in hardness with increasing annealing temperature. However, the Cu/Ni system shows a gradual and moderate hardness increase (up to 30%) from room temperature to 300 °C, while the Cu/Al system displays a sharp hardness surge (~150%) between 125 °C and 200 °C. The co-sputtered Cu-Ni and Cu-Al samples consistently demonstrate higher hardness than their multilayered counterparts, albeit with distinctly different temperature dependence—the hardness of Cu-Ni increases with annealing temperature while Cu-Al maintains a constant high hardness throughout the entire temperature range. The distinct thermal strengthening mechanisms observed in the two metallic multilayer systems can be ascribed to the formation of solid solutions in Cu/Ni and the precipitation of intermetallic phases in Cu/Al. This study highlights the unique advantage of intermetallic strengthening in metallic multilayer systems.

An approach for designing leakage compensated voltage reference circuit

ABSTRACT In this paper, the design of CMOS-based and recyclic folded cascode (RFC)-based voltage reference circuits is presented. Further inherent leakage compensation technique using diode connected MOSFET is introduced, which results in the compensation of high-temperature leakage current and a reduction in consumed power. Moreover, current mirror-induced mismatch and supply dependency reduces. Furthermore, temperature range and power supply rejection ratio (PSRR) improves. Later, comparison between the two configurations, i.e. with and without leakage compensation, has been presented. The minimum value of the achieved temperature coefficient on applying leakage compensation is 4.2 ppm/ºC for the proposed RFC op-amp-based voltage reference circuit with improved temperature range by 40°C. The obtained value of PSRR is −88.2 dB at 10 Hz, −66.8 dB for 1 KHz and −61.6 dB for 1 MHz frequency, with the line sensitivity of 0.031%/V and the variation of 1.69 mV for an entire operating temperature range. All the simulation results are obtained at 0.7 V supply voltage in 180 nm SCL technology.

First principles investigation on optoelectronic and thermoelectric response of nitrides cadmium novel zintl compounds AB2C2 (A=Mg, Ca, Sr, Ba; B = Cd and C= N)

Novel materials for high efficiency advance devices are critical to investigate. Zintl compounds are widely explored in the recent years because of their direct narrow band gaps, higher optical conductivity and figure of merit required for optimal-optoelectronic and thermoelectric response respectively. Thus, in the current study, the structural, electronic, optical and thermoelectric properties of nitrides cadmium novel Zintl compounds AB2C2 (A=Mg, Ca, Sr, Ba; B=Cd and C= N) having trigonal structure are studied by full potential linearized augmented plane wave method based on density functional and Boltzmann transport theory. The main objective of this project is to provide novel thermo electrical data on Cd-based Zintl compounds, such as nitride cadmium-based compounds. To get the desire results, the exchange correlations with generalized gradient approximation were used to obtain the ground state structure parameters in these compounds. The computed lattice parameters and c/a -ratio increase from the top to down while the bulk-modulus B(GPa) decreases from top to bottom. The modified versions of the Beck-Johnson potential (TB-mBJ) predict that CaCd2N2, SrCd2N2, BaCd2N2 and MgCd2N2 compounds are semiconductors with narrow band gap of 0.18 eV, 0.21 eV, 0.84 eV and 0.07 eV respectively. Based on the optical properties a deep analysis of dielectric constant, refractive index, reflectivity and optical conductivity were carried. Across the entire temperature range, all the compounds exhibit a positive Seebeck coefficient, indicating P-type conduction. The direct energy band gap nature of these compounds with high conductivity in the visible region shows their suitability for optical applications. Also, the figure of merit of these compounds is close to unity which also speaks about the high efficiency for thermoelectric applications.

Crystal structure and thermoelectric properties of bulk polycrystalline (SbxBi1-x)2Se3 alloys

Samples of (SbxBi1-x)2Se3 compounds were synthesized from pure elements via simple melting in evacuated quartz tubes. Internal crystal structure, distribution of constituent elements and surface morphology were examined by X-ray diffraction analysis, energy dispersive x-ray spectroscopy and scanning electron microscope, respectively. Over a temperature range of 300–480 K, electrical and thermoelectrical properties were investigated. The electrical conductivity showed semi-metallic behavior against temperature increasing till a certain point, thereafter, exhibited semiconducting trend. A significant increase was observed due to Sb-doping. Seebeck coefficient exhibited notable increase as temperature increases, reaching its maximum. However, a serious decrease was observed with further temperature increasing. The most Sb-doped compound (Sb0.1Bi0.9)2Se3 showed a maximum power factor of 13.29 μW cm−1 K−2 at 373 K. Temperature dependence of the thermoelectric figure of merit ZT was studied, showing that the values increase with temperature increasing and then decrease. For the pristine Bi2Se3 compound, at room temperature, ZT increased from 0.014 to 0.68 at 363 K and then decreased again to 0.13 at 473 K. Doping with Sb at x = 0.1 resulted in remarkable increase in the ZT values over the entire temperature range. The improvement in electrical conductivity and the power factor are responsible for the greatly enhanced ZT throughout the whole temperature range. The maximum ZT was found at 0.87 for (Sb0.1Bi0.9)2Se3 at 373 K.

The Influence of Graphite Filler on the Viscoelastic and Mechanical Characteristics of PC/ABS Hybrid Composite for Automotive Applications

This work aims to enhance the viscoelastic and mechanical properties of the neat Polycarbonate/Acrylonitrile Butadiene Styrene (PC/ABS) blend by incorporating graphite filler. Thermoplastic composites were prepared with PC/ABS as the matrix and graphite powder as fillers of 3, 6, and 9 wt% by injection molding. The influence of graphite particulate on the mechanical properties of PC/ABS/graphite composite was studied through tensile strength, tensile modulus, percentage elongation, impact strength, flexural strength, and modulus. The results show a 20% improvement in the tensile and flexural modulus of the PC/ABS/graphite composite compared to the neat PC/ABS blend. However, the tensile strength and percentage elongation were reduced by 11.64% and 29.63%, respectively. The storage modulus with 9 wt% of graphite in the PC/ABS blend has the highest modulus over the entire temperature range compared to the neat PC/ABS blend. The addition of graphite filler to the PC/ABS blend increased the tensile, flexural, and storage modulus, even though some mechanical attributes were compromised. The viscoelastic, mechanical, and thermal properties were enhanced by adding graphite as a filler to help plastic product designers design plastic products for automobile applications.

Damping materials based on plasticized polybutyl methacrylate, polymethyl methacrylate and polyvinyl acetate

The purpose of the presented work is to investigate by DMA method the influence of the composition of filled and unfilled plasticized compositions based on polyvinyl acetate (PVA), polybutyl methacrylate (PBMA) and polymethyl methacrylate (PMMA) on their damping characteristics. It was found that when plasticizer is introduced into the polymer, the value of the mechanical loss coefficient first increases, reaches its maximum, and begins to decrease with further increase in the plasticizer content. The maximum effect is observed at a plasticizer/polymer volume ratio of 0.2-0.4. Two other dissipative characteristics, the temperature interval of effective damping and the integral coefficient of mechanical losses, are changing similarly. It is established that the additives of chlorinated paraffins in compositions based on PVA and PBMA can significantly improve their vibration absorbing characteristics. Introduction of mica filler into the composition of plasticized compositions based on PVA and PBMA does not lead to the appearаnсe of additional relaxation mechanisms. With increasing of the content of mica, the elastic modulus of compositions increases in the entire temperature range (especially significantly for compositions with a high content of plasticizer), the coefficient of mechanical losses slightly decreases, and the temperature practically does not change at which the maximum damping is observed.

Features of calculating the temperature field in an annular porous layer under infinite heating

To date, easily recoverable oil reserves have already been extracted, so deposits with residual oil reserves or places with weak permeability are of great interest. It is known that oil becomes more viscous when the temperature decreases, which creates difficulties in its production. Therefore, to reduce the viscosity, it is necessary to heat the oil to the temperature at which it is possible to realize its production. The study proposes a mathematical model for calculating the temperature field in an annular porous layer under infinite heating in a downhole reactor for continuous heating of the bottom-hole zone of a formation containing high-viscosity oil and natural bitumen (HVO and NB).PURPOSE. To construct a heating solution for an infinitely long annular layer in a downhole reactor. To obtain a temperature profile in the cross section of the annular layer and a picture of the temperature field.METHODS. The equations of the mathematical model are based on the laws of conservation of energy and mass, their study and evaluation are carried out using analytical methods of the theory of differential equations, methods of similarity theory and dimensions, as well as numerical methods for solving boundary value problems. results. In the course of the study, the dependences of the distance at which the set air temperature in the reactor is reached at different values of mass air flow, linear heat flux density and the heat capacity of the mixture were obtained. conclusion. The conducted studies have allowed us to obtain a mathematical model for calculating the temperature field in an annular porous layer under infinite heating in an downhole reactor. The results obtained showed that with an increase in the mass flow rate and the heat capacity of the medium, the distance at which the set air temperature in the reactor is reached increases by 1.6 and 1.5 times, respectively, over the entire temperature range, and with an increase in the linear density of the heat flux, this distance decreases by 0.6 times.

Use of Pressure in Rotational Molding to Reduce Cycle Times: Comparison of the Thermomechanical Behavior of Rotomolded Reed/Polyethylene Composites

Rotational molding advantages include the production of a hollow part with no welding lines, either of small or big sizes, with no internal stresses and good surface details. However, the process is limited by the long cycle times, and its related high energy consumption. Different strategies can be followed to reduce such energy use. This work assesses the use of pressure inside the molds during the densification and cooling stages, finding reductions in overall cycle time of approximately 20%, because of the reduction in the heating time required but also to the increased cooling rate. The influence of such an approach on the production of composites with reed fibers has also been assessed, finding a similar trend towards cycle time reductions. The rotomolded samples’ thermomechanical and rheological behavior were determined, finding that viscosity was not affected due to the incorporation of air during the moldings; besides, the homogeneity of the composites increased due to the mold pressurization. The parts obtained show good aesthetics and good thermomechanical behavior along the entire temperature range studied, and particularly for 10% composites; higher fiber ratios should be prepared via melt compounding. Therefore, the mold pressurization allows us to reduce both oven and cooling times, which can be translated into an increase in productivity and a decrease in energy consumption, which are undeniably related to the increase in the products’ sustainability and cost.

Role of sintering temperature in modulating the charge transport of BiCuSeO thermoelectric system: correlations to the microstructure

The influence of sintering temperature on the thermoelectric (TE) transport of BiCuSeO is reported in the present work, with an aim to optimize the processing conditions for higher TE transport. BiCuSeO samples were synthesized at four different sintering temperatures, viz., 673 K, 773 K, 873 K, and 973 K. A non-degenerate type of conductivity is observed in all the samples at high temperatures, witnessing the thermal activation of the carriers. The Fermi level was positioned below the valence band maximum, thereby exhibiting a p-type degenerate transport in the entire range of temperature. It was observed that the variations of weighted mobility and power factor were found to have identical trends. The highest power factor was noticed at 554 K with a value of 129 μWm−1 K−2 for the sample sintered at 673 K.

Tunable sub-terahertz resonance absorption in high-coercivity magnetodielectric ceramics.

Recently, giant coercivities (20-42 kOe) and sub-terahertz natural ferromagnetic resonance (NFMR) at 100-300 GHz were observed for single-domain M-type hexaferrite particles with high aluminum substitution. Herein, we fabricated dense ceramics of Sr0.67Ca0.33Fe8Al4O19 and, for the first time, investigated their magnetostatic and magnetodynamic properties in the temperature range of 5-300 K. It was shown that dense ceramics maintain their high magnetic hardness (a coercivity of 10-20 kOe) and NFMR frequencies of 140-200 GHz durably in the entire temperature range. Magnetizing the initially non-magnetized ceramics leads to a considerable decrease in the resonance absorption and to almost complete vanishing of the resonance line at 5 kOe. At the same time, an efficient linear frequency tuning by the external magnetic field was observed for the remanent sample. These findings open new horizons for developing industrial terahertz electronics based on dielectric ferrimagnets.