Improved Temperature Stability Research Articles

NaNbO3 modified BiScO3-BaTiO3 dielectrics for high-temperature energy storage applications

Among the lead-free compositions identified as potential capacitor materials, BiScO3-BaTiO3 (BS-BT) relaxor dielectrics exhibit good energy storage performance. In this research, 0.4BS-0.6BT is considered as the parent composition, with NaNbO3 (NN) addition intended to substitute the A and B site cations. The NN modified BS-BT ceramics exhibit excellent temperature stability in terms of their dielectric properties, with the room-temperature dielectric constant on the order of 500–1 000 and variation less than 10% up to 400 °C. In addition, NN has a high band-gap energy leading to increased breakdown strength and energy storage properties in modified compositions. The highest breakdown strength was achieved for 0.4BS-0.55BT-0.05NN, being on the order of 430 kV/cm, and a high energy density of 4.6 J/cm3 with high energy efficiency of 90% was simultaneously achieved. Of particular importance is that the variation of the energy density was below 5% due to the temperature-insensitive dielectric constant, while ∼90% energy efficiency was retained over the temperature range of 25–160 °C. The improved temperature stability with NN addition makes this composition promising for high temperature capacitor and dielectric energy storage applications.

High energy storage and thermal stability under low electric field in Bi0.5Na0.5TiO3-modified BaTiO3-Bi(Zn0.25Ta0.5)O3 ceramics

Dielectric energy storage capacitors have been comprehensively investigated for application in advanced electronic systems. Compared to other types of ceramic capacitors, BaTiO3-BiMeO3 lead-free composite relaxor ferroelectric ceramics (where Me represents trivalent or trivalent composite ion) are excellent dielectric energy storage candidates in pulsed power fields. However, the properties of most existing BT-based energy storage ceramics are not satisfactory in some practical aspects, and feasible guidance on efficient composting material systems with large recoverable energy storage density (Wrec) for ultralow electric fields is lacking. Herein, for the first time, lead-free relaxor ferroelectric (1-x)[0.9BaTiO3-0.1Bi(Zn0.25Ta0.5)O3]-xBi0.5Na0.5TiO3 ceramics with x = 0, 0.1, 0.2, 0.3, and 0.4 were synthesized via composite strategy using the traditional solid-state process. The used strategy combined the complementary advantages of both BT-BZT and BNT to greatly increase the saturation polarization (Ps) and shift the stable temperature range of permittivity to high-temperature region, achieving higher energy storage density and improved temperature stability. Optimum energy storage performances with a high Wrec of 4.18 J/cm3 and comparatively high η of 84.01% were simultaneously achieved in the relatively low electric field of 230 kV/cm. Moreover, the ceramic obtained at x = 0.3 showed excellent temperature stability with the change rate of Wrec < 5% and η < 6% throughout a broad temperature range (20 °C ∼ 170 °C). This ceramic (x = 0.3) simultaneously possesses superior pulse performance, exhibiting the t0.9 of 232 ns and Wdis of 2.51 J/cm3. Overall, the employed composite strategy design is effective for obtaining energy storage capacitors with excellent performance for future advanced pulsed power devices.

Immobilization of maltogenic amylase in alginate-chitosan beads for improved enzyme retention and stability

Maltogenic amylase (Mag1) is a potent enzyme that hydrolyzes the glycosidic bond of polysaccharides to produce malto-oligosaccharides (MOS). However, the Mag1 enzyme has poor stability and reusability, leading to inefficient MOS production. Enzyme immobilization is a promising method to solve the enzyme stability problem. Entrapment and encapsulation technique was used in this study to immobilize Mag1 because of high biocompatibility and prevention of enzyme degradation, hence lesser loss of enzymatic activity. Chitosan was used as a coating membrane on the alginate matrix, preventing enzyme leaching from the beads. Mag1 entrapped in alginate-chitosan beads showed better performance compared to alginate beads in terms of thermostability, reusability and enzyme retention. Alginate-chitosan beads showed improvement of temperature stability of approximately 35%, 30% and 20% at a respective temperature of 30 °C, 40 °C and 50 °C. Reusability analysis showed immobilized Mag1 can be used up to at least eight cycles with retained activity of 80% and 70% from its initial activity for alginate-chitosan and alginate beads respectively. Enzyme leakage percentage in alginate-chitosan was 7-21%, while that in alginate was 12-35%. The overall findings envisage the promising application of alginate-chitosan beads immobilized Mag1 as a biocatalyst for MOS synthesis.

Optical Properties and Optimization of LaB6 Thin Films for Photothermal Applications

AbstractThe growth of highly crystalline LaB6 films with an excellent optical response and low loss is reported, which will be useful for high‐performance photothermal device applications when combined with their inherent refractory properties. Optimum growth parameters for realizing uniaxial and coherent LaB6 thin films, exhibiting an excellent plasmonic response for near‐ to mid‐infrared device applications, are established. Numerical electromagnetic simulations of the epitaxial LaB6 nanostructures revealed that the electromagnetic field at the LaB6 surface can be as high as that of the Au nanostructures. Furthermore, the LaB6 nanostructures show resonance in the visible (red) to mid‐infrared region comparable to those of Au with the added advantage of improved temperature stability that can withstand harsh photothermal device operations.

(Cu1/3Nb2/3)4+ ionic substituting effects, low-temperature sintering behaviors, and improved temperature stability of Ba3Nb4Ti4O21 microwave dielectric ceramics

In this study, (Cu1/3Nb2/3)4+ complex cation and BaO–ZnO–B2O3 glass frit were adopted to solve the high sintering temperature and poor temperature stability of Ba3Nb4Ti4O21 ceramics. It is shown that pure Ba3Nb4Ti4O21 phase was formed when Ti site was partially replaced by (Cu1/3Nb2/3)4+ cation. The increasing number of dopants decreases the dielectric polarizability, correspondingly, the dielectric constant and temperature coefficient of the resonance frequency values are reduced consistently. The variation of the Q × f value is determined by internal ionic packing fraction and external sintering densification. The (Cu1/3Nb2/3)4+ cation effectively decreases the suitable sintering temperature from 1200 to 1050 °C while greatly improving the temperature stability. BaO–ZnO–B2O3 glass was used to further improve the low-temperature sintering characteristics of Ba3Nb4Ti4O21 ceramics. It is proven that the addition of glass frits effectively decreases the temperature to 925 °C with combinational excellent microwave dielectric properties: εr ∼55.6, Q × f ∼5700 GHz, τf ∼3 ppm/°C, making the Ba3Nb4Ti4O21 ceramics promising in the applications of low-temperature cofired ceramic technology.

Enhanced temperature stability of dielectric tunable performance of (1-x)Ba(Zr0.36Ti0.64)O3–x(Ba0.82Ca0.18)TiO3 ceramics by compositional tailored diffuse phase transition

In the broad application of tunable devices, the temperature stability of the dielectric tunable performance of ceramics should be considered. In this work, (1- x )Ba(Zr 0.36 Ti 0.64 )O 3 – x (Ba 0.82 Ca 0.18 )TiO 3 (BZ 0.36 T– x BC 0.18 T) ceramics, where x = 0.3–0.7, were prepared by the solid-state high-temperature method. The combined effects of Ca 2+ and Zr 4+ ions on the microstructure of BZ 0.36 T– x BC 0.18 T ceramics were observed. The crystal structure was analyzed through X-ray diffraction, showing a pure perovskite ABO 3 -type structure, indicating the formation of a BCZT solid solution. High dielectric tunability ( n r > 85% at < 10 kV/cm) under a low DC bias field is achieved in BZ 0.36 T–0.5BC 0.18 T and BZ 0.36 T–0.6BC 0.18 T, especially the maximum value of n r ∼87.51% at 7.68 kV/cm obtained for BZ 0.36 T–0.6BC 0.18 T. High tunability under a low DC bias field may be related to not only the extrinsic contribution (dipole reorientation, domain-wall motion) but also the intrinsic contribution (lattice phonon or anharmonic interactions of B-site ions). The maximum FOM value of ∼847 is achieved in BZ 0.36 T–0.5BC 0.18 T, which is related to the high n r ∼74.57% and lower tan δ ∼8.8 × 10 −4 at 400 V, demonstrating its excellent performance for tunable device applications. Furthermore, the FOM – T curve of BZ 0.36 T–0.3BC 0.18 T ceramics in the range of 126–269 is flatter than other compositions in the temperature range of −20°C-100 °C, showing an improved dielectric tunable performance with better temperature stability. The improved temperature stability of BZ 0.36 T–0.3BC 0.18 T may contribute to the enhancement of the diffuse phase transition (DPT) degree, which results in a flattened phase transition region. These results suggest that BZ 0.36 T–0.3BC 0.18 T is competitive candidate for temperature-stable tunable device applications, and the compositional tailored DPT can be expected to be a feasible means to improve the temperature stability of dielectric tunable performance.

Correlating the microstructure and magnetic properties of MnZn power ferrites via Co2O3 and MoO3 co-doping for MHz applications

MnZn power ferrites for MHz and wide temperature applications were prepared by ceramic process and effects of Co2O3 and MoO3 co-doping on the microstructure and magnetic properties have been investigated, and MnZn power ferrite with ultra-high cut-off frequency of 14.2 MHz has been prepared. It has been revealed that the grain size of the MnZn ferrite can be homogenize via the co-doping of Co2O3 and MoO3, giving rise to enhanced electrical resistivity, compensated magnetocrystalline anisotropy and reduced domain wall displacement. Effective reduction of the power loss with improved temperature stability and cut-off frequency have been achieved by synergistic function of Co2O3 and MoO3 via liquid-phase sintering increasing the possibility of Co2+ cation entering into the spinel lattice.

Improvement of temperature-stability and piezoelectric performance of Pb(In0.5Nb0.5)O3–PbTiO3 crystals via Nd doping

High-performance relaxor-PbTiO3 ferroelectric crystals have been widely applied in transduces, sensors and so on. The ferroelectric phase transition temperature restricts their application in automobile, deep oil-well detection and aerospace which requires high thermal stability. Decreasing the effects of ferroelectric phase transition is a promising strategy for improving the thermal stability. Here, the design strategy is structural regulation via rare earth doping tetragonal Pb(In1/2Nb1/2)O3–PbTiO3 (PIN-PT) crystals. The d33, k33 and TC of [001]c-oriented Nd-PIN-PT crystals are 750 pC/N, 87%, 250 °C. Compared with the d33 of tetragonal 0.61PIN-0.39 PT crystals (540 pC/N) and tetragonal 0.35PIN-0.26 Pb(Mg1/3Nb2/3)O3 (PMN)-0.39 PT crystals (530 pC/N), the d33 of Nd-PINT crystals enhance by 39% and 41%. In addition, Nd-PIN-PT crystals have Qm of 110, which is larger than rhombohedral relaxor-PbTiO3 ferroelectric crystals (~50). Although the d33 of Nd-PIN-PT crystals is lower than that of rhombohedral relaxor-PT ferroelectric crystals, the d33 and k33 are stable up to 250 °C, which is higher than tetragonal PIN-PMN-PT crystals (210 °C). The high thermal stability of piezoelectric properties is related to the high thermal stability of domain after poling. This work provides a design strategy for high thermal stability ferroelectric crystals.

Tuning the Covalency of A-O Bonds to Improve the Performance of KNN-Based Ceramics with Multiphase Coexistence.

Although a room-temperature multiphase coexistence (MPC) strategy improves the piezoelectric coefficient (d33) of potassium sodium niobate ((K,Na)NbO3, KNN) ceramics, it still suffers from the dependencies on composition and temperature, making it remain challenging to further improve d33 and temperature stability of strain for an already-built MPC. Here, we proposed a new route to resolve this issue, that is, tuning the covalency of A-O bonds in an already-built MPC. We chose 0.96(Na0.60K0.40)(Nb0.955Sb0.045)O3-0.04(Bi0.5Na0.5)ZrO3 ceramics as an already-built MPC and replaced (Bi0.5Na0.5)2+ with Ba2+ to tune the covalency of A-O bonds. Thus, we synthesized 0.96(Na0.60K0.40)(Nb0.955Sb0.045)O3-0.04(Bi0.5Na0.5)1-xBaxZrO3 ceramics. We not only improved d33 values from 450 pC/N (at x = 0) to 500-505 pC/N (at x = 0.05-0.10) but also obtained the enhanced temperature stability for strain at x = 0.10, outperforming that of samples with x = 0 and other KNN-based ceramics. The increased d33 is attributed to the well-preserved MPC and the repaired long-range ordering, and the improved temperature stability of strain is due to shifting the MPC to a slightly higher temperature than room temperature. Therefore, the new route is useful to further improve the performance of an already-built MPC, benefiting to the future design of MPC and the practical application of KNN-based ceramics.

Wireless Passive Intracranial Pressure Sensor Based on Vacuum Packaging

This paper presents a wireless passive pressure sensor based on a pressure-sensitive capacitor specifically designed to monitor intracranial pressure (ICP) in patients with traumatic brain injuries. It is crucial that temperature will affect the accuracy of pressure detection. To improve temperature stability, the capacitor is composed of an SOI wafer as the sensing element and a glass cap for vacuum packaging. To realize reliable vacuum packaging, it is vital to transfer the electrical signal out of the vacuum cavity. The experimental results show that the proposed sensor demonstrated averaged pressure sensitivity and averaged temperature sensitivity of 0.5803 Hz/kPa and 0.024 Hz/°C. Additionally, the in-vivo test in the animal show that the proposed sensor has the similar detection effect with the commercial wired sensor, and naturally has the advantage of reducing the risk of infection, which further validated the feasibility and effectiveness of the wireless passive ICP monitoring system.

Relaxor behavior of potassium sodium niobate ceramics by domain evolution

Relaxor behavior is proved to be responsible for high piezoelectricity in piezoelectric materials due to the promoted polarization rotation, and an ultrahigh piezoelectricity can be also induced in potassium sodium niobate [(K,Na)NbO3, KNN]-based ceramics by dielectric relaxation at the multiphase coexistence region. However, it is still absent of the association study between domain evolution and relaxor behavior created by nanoscale multiphase coexistence. Herein, the frequency-dependent domain response, dwell-time dependence of domain radius and voltage-dependent domain switching are characterized in KNN-based ceramics with relaxor R–T phase boundary. These novel domain evolutions further illustrate the contribution of relaxor behavior on high piezoelectricity, yielding to easy polarization rotation based on low energy barrier of polar nanoregions merging into long-range ordering states. And an improved temperature stability is observed at 30−60 °C for relaxor R–T due to the unusual domain evolution. This study affords a new perspective in the mechanism of high-performance lead-free piezoelectrics.

Single Residue Substitution at N-Terminal Affects Temperature Stability and Activity of L2 Lipase.

Rational design is widely employed in protein engineering to tailor wild-type enzymes for industrial applications. The typical target region for mutation is a functional region like the catalytic site to improve stability and activity. However, few have explored the role of other regions which, in principle, have no evident functionality such as the N-terminal region. In this study, stability prediction software was used to identify the critical point in the non-functional N-terminal region of L2 lipase and the effects of the substitution towards temperature stability and activity were determined. The results showed 3 mutant lipases: A8V, A8P and A8E with 29% better thermostability, 4 h increase in half-life and 6.6 °C higher thermal denaturation point, respectively. A8V showed 1.6-fold enhancement in activity compared to wild-type. To conclude, the improvement in temperature stability upon substitution showed that the N-terminal region plays a role in temperature stability and activity of L2 lipase.

Composition gradient (1-x)Ba(Zr0.2Ti0.8)O3-x(Ba0.7Ca0.3)TiO3 film with improved dielectric, piezoelectric and ferroelectric temperature stability

Lead-free (1-x)Ba(Ti0.8Zr0.2)O3-x(Ba0.7Ca0.3)TiO3 (BZT-BCT) possesses comparable piezoelectric constant with lead zirconate titanate (PZT), but its poor temperature electric performances stability and low Curie temperature limit its application. Here we designed composition graded BZT-BCT films with improved temperature stability of piezoelectric, ferroelectric, and dielectric performances over a wide temperature range, and the d33 reaches 21 pm/V with hysteresis loop even at 180 °C, which is far above the Curie temperature of BZT-BCT ceramic and BZT-0.5BCT film. The excellent temperature stability is ascribed to the lattice distortion and strain gradient in the grains caused by ions diffusion, and could suppress phase transition. This work could bring forward a feasible design for dielectric/piezoelectric/ferroelectric devices operating in harsh temperature environment.

Preparation of SiO2 grafted polyimidazole solid electrolyte for lithium-ion batteries

Solid electrolytes have emerged as a promising alternative to liquid electrolytes for application in solvent-free lithium rechargeable batteries. Composite polymer electrolytes based on polymer and nanoparticle exhibit acceptable ion conductivity due to the interaction between nanofillers and polymer. However, the application of composite polymer electrolytes is hindered by the agglomeration of nanofillers at high concentration. Herein, in this study, the polymer electrolytes with branched polyimidazole were synthesized by radical polymerization based on functionalized SiO2 nanoparticles and imidazole monomers. Different from the reported methods of blending ceramic particles with polymers, we introduce an in situ synthesis of branched polymer electrolyte based on functionalized SiO2 nanoparticles. The stronger chemical interactions between SiO2 nanospheres and polymer chains could significantly suppress the aggregation of the nanoparticles and improve temperature stability. Among all of the electrolyte films, SiO2-MOBIm6-BF4 shows the best ion conductivity of 5.96 × 10−5 S cm−1 at 25 °C and the value reaches to 9.54 × 10−4 S cm−1 at 95 °C. This is mainly due to the long methylene chain increasing the flexibility of the chain segment and the molecular mobility, which is benefit to lithium-ion transportation. The electrochemical stabilization window can reach 4.85 V at room temperature, and the LiFePO4/SiO2-MOBIm6-BF4/Li battery was assembled with the electrolyte based on SiO2-MOBIm6-BF4. The first discharge capacity can reach 158.3 mAh g−1, and the batteries show good cycle performance.

Improved temperature stability of a fiber Sagnac-like detection system for atomic magnetometers.

A novel fiber Sagnac-like detection system has unique competitive advantages for detecting atomic spin precession in atomic magnetometers. Unfortunately, its operating stability is severely limited by temperature fluctuations. In this paper, we describe a new approach to improve the temperature stability by using the ratio signal as the output instead of the conventional fundamental component. This method can effectively counteract the temperature-caused fluctuations in both light intensity and scale factor of photodetector. For a temperature range from 20°C to 40°C, a relative fluctuation of the ratio output signal of 0.97% was achieved, which was 17.4 times better than the fundamental component output. Moreover, no additional equipment and complex compensation algorithms are required during this process. It is a generic method that can also be applied to improve the stability of other detection schemes used in atomic magnetometers.

Influences of rare earth site engineering on piezoelectric and electromechanical response of (Ba0.85Ca0.15) (Zr0.1Ti0.9)O3 lead-free ceramics

The significant deterioration of temperature and fatigue stability are often observed in (Ba0.85Ca0.15) (Zr0.1Ti0.9)O3 (BCZT) ceramics, which will cause great resistance in practical applications. We have demonstrated that introducing various rare earth elements (e.g., Dy, Er, Eu, Ho, Pr and Sm) into BCZT ceramics can effectively solve above obstacle. The effects of the doped rare earth element types on the crystal phase, microstructure and resulting properties have been comparatively investigated. The rare earth ions (e.g., Dy, Eu, Ho, Pr and Sm) substituting at the A site are beneficial to acquire the enhanced piezoelectric properties (475–521pC/N) and electromechanical response (505–546 pm/V) for BCZT ceramics, while Er doping generates degraded electrical properties. More importantly, significantly improved temperature stability of piezoelectric properties was achieved in Eu-and Ho-doped BCZT ceramics, featured by less than 8% and 2% variation in the temperature range 20–70 °C. Moreover, excellent fatigue endurance and good frequency dependence were also realized in rare earth element-modified BCZT ceramics, which originated from the decreased defect density due to the reduction of oxygen vacancies. This work will provide a promising way to improve the temperature and fatigue stability of BCZT material without affecting the piezoelectric properties through doping various rare earth elements.

Improvement of Temperature Stability, Dielectric Properties and Nonlinear Current-Electric Field Characteristic of CaCu3Ti4.2−xSnxO12 Ceramics

The dielectric properties and the nonlinear current density–electric field (J–E) relationship of CaCu3Ti4.2−xSnxO12 (x = 0.00, 0.05 and 0.10) ceramics at various sintering temperatures are presented. Excellent dielectric properties with a very low tanδ ∼ 0.008–0.020, a giant e′ ∼ 6495–16,975, and stability of Δe′ of < ± 15% over the temperature range of −60 to 210°C are obtained in a CaCu3Ti4.15Sn0.05O12 ceramic sintered at 1080°C and CaCu3Ti4.10Sn0.10O12 ceramics sintered at both 1080°C and 1100°C. Additionally, all ceramics exhibited a nonlinear J–E relationship. A maximal nonlinear coefficient (α) of ∼ 1044.4 is obtained in the CaCu3Ti4.15Sn0.05O12 sintered at 1080°C. X-ray diffraction and field emission scanning electron microscopy techniques were used for structural and microstructural evaluation of all ceramics. Elemental mapping with energy dispersive X-ray spectroscopy confirmed the presence of Sn4+ dopant at the main CaCu3Ti4O12 site and in minor TiO2 phases of all Sn4+ doped CaCu3Ti4.2O12 ceramics. This mixed phase plays an important role to increase grain boundary resistance (Rgb) and significantly improves the thermal stability of dielectric properties, as well as the nonlinear J-E relationship.

High-performance potassium sodium niobate piezoceramics for ultrasonic transducer

Ultrasonic transducers can be used as medical diagnostic imaging and nondestructive testing. This work presents phase structure engineered high-performance potassium sodium niobate [(K,Na)NbO3, KNN]-based ceramics and its potential application on ultrasonic transducer. A connection among structural engineering, electrical properties, and prototype device designing was established in lead-free KNN-based ceramics. Structural elucidation through atomic resolution polarization mapping by Z-contrast imaging indicates that the nanoscale balanced multiple phase coexistence (R-O-T) is the origin of both enhanced piezoelectricity and improved temperature stability: high d33 of 500 pC/N and improved in-situ temperature stability of d33 (less than 24% variation for d33 from 25 to 100 °C), together with the improvement of electromechanical coupling coefficient (kp~0.5 and kt~0.55). Based on the high-performance ceramics, a 1–3 composite ultrasonic transducer with a center frequency of 5 MHz is produced, and a bandwidth of 81% at −6 dB is substantially higher than that of PZT-based transducers at the same center frequency. We believe the novel way to improve electrical properties through structural engineering could open a new road to promote the practical application of KNN-based ceramics.

Preparation and characterization of the Sr2+-doped γ-Ce2S3@c-SiO2 red pigments exhibiting improved temperature and acid stability

Crystal SiO2-coated Sr2+-doped red γ-Ce2S3 (Sr2+-doped γ-Ce2S3@c-SiO2) pigments were successfully synthesized via the Stöber method using Sr2+-doped CeO2 and amorphous SiO2 (a-SiO2) sol as the precursors. Further, the effects of the Ce3+/Si4+ mole ratio x, sulfurization temperature, and calcination temperature on the color performance, acid corrosion resistance, and temperature stability of the Sr2+-doped γ-Ce2S3@c-SiO2 pigments were systematically investigated. The results reveal that Sr2+-doped γ-Ce2S3@c-SiO2 exhibiting improved acid corrosion resistance and color performance (L* = 38.22, a* = 28.97, and b* = 25.49) can be obtained when x = 0.4. The γ-Ce2S3 pigments can be effectively protected from oxidation at high temperatures by applying a transparent crystal SiO2 (c-SiO2) coating layer on the pigment surface. The oxidation temperature of the Sr2+-doped γ-Ce2S3 increased from 479 °C to 883 °C by applying c-SiO2 encapsulation, demonstrating considerable application potential in the ceramic pigment industry.

Low-loss and temperature-stable (1−x)Li2TiO3–xLi3Mg2NbO6 microwave dielectric ceramics

Low-loss (1−x)Li2TiO3–xLi3Mg2NbO6 (LT-LMN, 0.02 ≤ x ≤ 0.08) microwave dielectric ceramics (MDCs) with rock salt structures were fabricated via a traditional solid-state reaction route. Li3Mg2NbO6 was used as a Li2TiO3 compensator to improve temperature stability. Scanning electron microscope observations and X-ray diffraction analyses were used to investigate the microstructures and crystalline structures of the ceramics, respectively. We demonstrated a correlation between macroscopic “dark hole” phenomena and the microwave dielectric properties (MDPs) of LT-LMN ceramics by analysing the valence states of Ti ions and the content of oxygen vacancies using X-ray photoelectron spectra. We continuously added Li3Mg2NbO6 to pure Li2TiO3 to form MDCs, and found that at x = 0.04, (1−x)Li2TiO3–xLi3Mg2NbO6 ceramics achieved a near-zero resonance-frequency temperature coefficient (τf). 0.96Li2TiO3–0.04Li3Mg2NbO6 ceramics sintered at 1250 °C had excellent MDP values: appropriate permittivity (ϵr) = 19.12, high quality factors (Q × ƒ) = 70814 GHz (at 6.105 GHz), and τf = 2.6 ppm/°C. This indicates that LT-LMN ceramics are promising materials for high-selectivity microwave ceramic dielectric substrates.