Doped Ceramics Research Articles

Enhanced Pyroelectric Performances in Textured Na0.5Bi4.5Ti4O15 Ceramics for Infrared Detection.

The pyroelectric effect is extensively used in infrared imaging, detection systems, military equipment, and smart furniture, which require pyroelectric materials to simultaneously possess a high pyroelectric coefficient (p) and a high Curie temperature (Tc) for circuit integration. However, the Tc of commercial lead zirconate titanate (PZT) is limited to 230 °C, imposing an insurmountable challenge in the integration. Here, we investigated the pyroelectricity in Na0.5Bi4.5Ti4O15 (NBT) with a high Curie temperature (∼660 °C), meeting the temperature requirements for integration. Textured NBT ceramics with a high degree of orientation (80%) were fabricated by using tape-casting, resulting in a p of 122 μC m-2 K-1, a 144% improvement over randomly oriented NBT ceramics. This method was also applied to doped NBT ceramics (NBTM-5Nb), achieving an impressive p of 252 μC m-2 K-1, representing a 400% improvement compared to randomly oriented NBT ceramics. Meanwhile, the textured NBTM-5Nb ceramics exhibit excellent figures of merit with Fi = 1.05 × 10-10 m V-1, Fv = 0.09 m2 C-1, Fd = 4.9 × 10-5 Pa-1/2, comparable to the performance of PZT. Furthermore, the textured ceramics exhibit excellent thermal stability, with no performance degradation after annealing at 300 °C, rendering them suitable for circuit integration.

Assessing the shielding capability of NiO-infused BPSCCO ceramics against low-energy X-rays

This research examines the improvement of radiation shielding capabilities in Bismuth Strontium Calcium Copper Oxide (BSCCO) superconductors via NiO doping. With the increasing need for advanced shielding materials in high-risk areas, exploring effective and nonhazardous alternatives is becoming increasingly important. The purpose of the study was to investigate the radiation-shielding characteristics of BPSCCO superconducting ceramics and the effects of NiO additives on their shielding properties. Comparisons of linear attenuation coefficient (LAC), mass attenuation coefficient (MAC), half-value layer (HVL), tenth-value layer (TVL), mean free path (MFP), as well as fully simulated values for transmission factor (TF), neutron removal cross section (ΣR), electrical conductivity (Ceff), alpha and proton stopping powers, and radiation protection efficiency (RPE) using NIST XCOM, Phy-X, NIST Pstar and NIST Astar for all ceramic samples. The results indicate that optimal NiO doping notably enhances the radiation shielding capabilities of BSCCO ceramics, highlighting their significant potential for use in the medical, aerospace, and nuclear industries. This research provides a fundamental understanding of the potential of doped superconductor ceramics for radiation protection, promoting further research into these materials and the creation of safer, more efficient shielding solutions.

Defect engineering design and electrical breakdown model improve dielectric properties and reliability of rare-earth doped BaTiO3-based ceramics

The incorporation of rare-earth elements into BaTiO3-based multilayer ceramic capacitors (MLCCs) plays a pivotal role in enhancing the dielectric constant and reliability. In this study, The BaTiO3-based ceramics doped with La and Dy were prepared separately and their dielectric properties and reliability were thoroughly compared. The La-doped sample exhibited a significantly enhanced dielectric constant, which can be attributed to the short-range migration of liberated oxygen vacancies () facilitated by the incorporation of defects -. However, the presence of free in the La-doped sample led to a significant reduction in insulation resistivity during the initial application of the electric field. Microstructural analysis of the failure points resulted in the proposal of an electrical breakdown model, which elucidates the superior breakdown strength observed in the La-doped sample. This study provides novel insights for the development of MLCCs with high dielectric constants and high reliability.

Enhanced low‐field energy storage performance in Nd3+‐doped (Bi0.40K0.2Na0.2Sr0.2)TiO3 high‐entropy ceramics

AbstractThe burgeoning requirement for compact electronic devices has intensified research into lead‐free dielectric ceramics that offer superior recoverable energy storage density and efficiency at low electric fields. In this study, we report the synthesis of Nd3+‐doped (Bi0.4K0.2Na0.2Sr0.2)TiO3 perovskite ceramics via the solid‐state reaction technique. The synthesized ceramics adopted a tetragonal crystal structure. As the concentration of Nd3+ ions increased, both the maximum dielectric constant (εm) and its corresponding temperature (Tm) decrease. The incorporation of Nd3+ ions perturbed the long‐range ferroelectric order, leading to diminished maximum polarization (Pm) and remanent polarization (Pr). The ceramics achieved optimal properties with 12 mol% Nd3+ doping, showcasing a significant recoverable energy storage density of 1.50 J/cm3 at a low electric field of 140 kV/cm, along with an exceptional storage efficiency of 94.6%. This research not only highlights a promising candidate for dielectric materials in low electric field applications but also introduces an innovative approach to enhance energy storage performance.

La3+ doped CaCu3Ti4O12 ceramics: Investigation of its microstructural and dielectric properties against varying sintering durations

This article reports the relationship between microstructure and dielectric properties of the title material were prepared through combination of solid-state and sol–gel methods and then sintered by varying durations. XRD indicates Im-3 space group with a body centred cubic structure, and Rietveld refinement analysis showed good fits for all samples, with R-factors below 10 % and GoF less than 2. The XPS analysis revealed the existence of Ca 2p, La 3d, Cu 2p, Ti 2p, O 1s, and C 1s retained their correct oxidation states. SEM results show grain sizes of 1.10 (±0.25) μm, 1.24 (±0.10) μm, and 1.75 (±0.31) μm for 8, 12, and 16 h of sintering, respectively. EDS analysis confirms the presence of Ca, Cu, Ti, La, and O, indicating the purity of the ceramics. As the sintering duration increases, grain enlargement consistently leads to higher εr values with very low tanδ. At a low frequency of 50 Hz, εr increases with sintering duration, reaching values of 5.65 × 103, 5.90 × 103 and 9.94 × 103. Meanwhile, tanδ remains significantly low (<0.1) at 1 kHz. The Nyquist plots demonstrate deviation from Debye type relaxation with NTCR behaviour. The frequency-dependent AC conductivity follows Jonscher’s power law, with activation energy values of 0.44 eV, 0.46 eV, and 0.49 eV for ceramics sintered for 8, 12, and 16 h, respectively.

Effect of SiO2-Li2O3-CuO additive on piezoelectric properties of PMS-PZT ceramics at low sintering temperature

Lead zirconate titanate (PZT) based piezoelectric ceramics are applied in ultrasonic transducers and multilayer actuators fields universally. Excellent piezoelectric properties of PZT-based ceramics of low sintering temperature are crucial for the applications of high-power motors and multilayer piezo-actuators due to the reduction of cost and energy consumption. In this paper, a ternary solid-solution ceramic system 0.05Pb(Mn1/3Sb2/3)O3-0.47PbZrO3-0.48PbTiO3 (PMS-PZT) was studied. A new complex additive composed of SiO2-Li2O3-CuO was doped into the PMS-PZT ceramics. The doping of CuO and Li2O3 was discovered to be able to lower the sintering temperature and remain electric properties efficiently, while the doping of SiO2 can decrease the grain size and increase the density. All ceramic samples were fabricated by solid-phase reaction method and sintered in the low temperature range from 800 °C to 1000 °C. The phase structure, morphology of natural surface and electrical properties of ceramics doped by 0.5 wt% additive were characterized. The 0.5 wt% additive doped PMS-PZT ceramics exhibit remarkable comprehensive piezoelectric properties sintered at 900 °C (d33 = 343 pC/N, Qm = 1016, Tc = 328 °C, tanδ = 0.4 % (at 25 °C), εr = 1344, d33* = 490 pm/V). The sintering temperature 900 °C is significantly below the melting point of Ag (961.9 °C) and Cu (1083.4 °C), so the more cost-effective Cu internal electrodes and Ag rich Ag/Pd electrodes can be used to substitute the expensive Pd rich Ag/Pd internal electrodes in the production of devices composed of multilayer ceramic. The research of this work provides an important candidate additive for the applications of high-performance transducers and multilayer actuators with low cost.

Reestablishment of dielectric and nonlinear properties for Bi3+ doped CaCu3Ti4O12 ceramics prepared by reduction-reoxidation method

Multilayer ceramics with base metal internal electrodes should be prepared through reduction sintering to avoid the oxidation of the electrodes, followed by a reoxidation process. In this study, Ca1-xBixCu3Ti4-x/4O12 + 0.03 BN ceramics were fabricated using the reduction-reoxidation method and the reestablishment of dielectric and nonlinear characteristics was investigated. It was observed that the dielectric and nonlinear properties depended crucially on the grain size and the second phases at the grain boundaries. The reoxidation behavior was remarkably improved when grain growth was suppressed and second phases were introduced. Optimal electrical properties were obtained for samples with x = 0.1 sintered at 1050 °C and reoxidized at 800 °C. The dielectric loss decreased to a value of about 0.14, while the permittivity remained a relatively large value of about 9.9 × 103 at 103 Hz. Additionally, the nonlinear coefficient and breakdown field were improved to a value of 2.2 and 981.8 V/cm, respectively. This study illustrates an efficient approach to enhance the reestablished dielectric and nonlinear properties for Bi3+ doped CaCu3Ti4O12-based ceramics fabricated through the reduction-reoxidation method.

Modeling thermoelectric performance of doped BiCuSeO oxychalcogenide ceramics using genetically hybridized support vector regression computational method

Oxychalcogenide BiCuSeO thermoelectric material has demonstrated significant potentials in addressing energy crisis through thermal to electrical energy conversion. Low toxicity, reduced cost of input materials and good stability when operated at high temperatures are unique features that promote the candidature of BiCuSeO ceramics. However, the thermoelectric figure of merit (FM) which influences the conversion (energy) efficiency of BiCuSeO material is characterized with small value due to low carrier mobility and concentration. Incorporation of various kind of dopants at different sites, vacancies and defects creation are among the experimental approaches of enhancing thermoelectric performance (usually, figure of merit). In order to circumvent laborious experimental procedures and to strengthen material design for sustainable applications, the maximum value of thermoelectric figure of merit of doped BiCuSeO ceramics is modeled in this work through genetic evolutionary algorithm hybridized support vector regression (HSVR) using ionic radii and dopant concentrations-based descriptors. FM-HSVR-G model developed with Gaussian kernel performs better than FM-HSVR-P that employs polynomial transformation kernel using different performance assessment parameters such as root mean square error (RMSE), correlation coefficient (CC) and mean absolute error (MAE). When validated on the testing samples of BiCuSeO ceramics, FM-HSVR-G model shows 45.40 % (for CC parameter), 16.87 % (for MAE parameter) and 14.00 % (for RMSE parameter) performance improvement over FM-HSVR-P model. Comparison of the present models with the existing machine learning (ML) model indicates that FM-HSVR-P and FM-HSVR-G model outperform ML (2022) model with enhancement of 22.05% and 72.04 %, respectively using metric based on RMSE. Ability of some elemental dopants to strengthen the thermoelectric performance of pristine BiCuSeO ceramic was investigated using the model developed while the obtained behavior agrees well with the experimental trends. The characteristic precision and accuracy of the developed models would definitely strengthen thermoelectric performance of BiCuSeO based compounds and further facilitate BiCuSeO ceramic material design for controlling energy crisis and other sustainable applications.

Effect of sintering temperature and doping content on phase evolution and microstructure of doped UO2 ceramics

ZrO2-doped UO2 ceramics have been considered as a promising high performance nuclear fuel in LWR due to its desirable properties. ZrO2-doped UO2 ceramic fuel samples with different contents of ZrO2 (20 wt%, 25 wt% and 30 wt% ZrO2, equivalent to 35.4 mol%, 42.3 mol% and 48.4 mol%, respectively) were prepared by pressureless sintering at various temperatures (1550 ℃, 1650 ℃ and 1750℃, respectively) for 4 h in a hydrogen reducing environment. Phase evolution and microstructure of as-sintered ZrO2-doped UO2 ceramic samples were investigated by X-ray diffractometer (XRD), scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS), respectively. Results show that there exists coexistence of uranium-rich U1-xZrxO2 phase with face-centered cubic (FCC) structure and zirconium-rich Zr1-yUyO2 phase with tetragonal structure in the 20 wt% ZrO2-doped UO2 ceramic sample when the sintering temperature is lower than 1650 ℃, while the UO2 and ZrO2 will form a single U1-xZrxO2 solid solution after sintering at 1750℃ for 4 h with the ZrO2-doped UO2 ceramic samples containing 25 or 30 wt% ZrO2, respectively. The significant differences of phase structure and ionic radius between ZrO2 and UO2 and the high atomic diffusion barrier are the main reasons that it is difficult to form a single solid solution for UO2-ZrO2 ceramic samples sintered at low temperature.

Superior ionic conductivity of Zr–doped LiTa2PO8 ceramics

The recently discovered LiTa2PO8 ceramic material holds promise as a solid electrolyte for all–solid–state batteries. In this study, comprehensive characterization techniques, including XRD, MAS NMR, Raman spectroscopy, TMA, SEM/EDX, IS, DC potentiostatic polarization and Archimedes principle, were employed to investigate the influence of varying concentrations of Zr dopant on the electrical, microstructural, and structural properties of doped LTPO ceramics. Remarkably, the highest total ionic conductivity was observed for the LTPO–0.05Zr ceramic, reaching 0.92 mS/cm at 30 °C. Moreover, the grain conductivity values remained consistently around 1.6 mS/cm, irrespective of the Zr dopant concentration. Microstructural and phase purity analyses revealed that the content of secondary phases significantly impacted the total ionic conductivity. The presence of glassy LiZr2(PO4)3 material appeared to positively influence the electrical properties of the LTPO–Zr ceramics. A discussion about the accurate location of zirconium within the material was performed.

Enhanced dielectric and relaxation properties in Sm3+ doped KNNT ceramics

The effect of Sm3+ doping on KNNT ceramic were comprehensively investigated, specifically focusing on the phase, microstructure, and dielectric properties of (1-x)K0.5Na0.5Nb0.7Ta0.3O3·xSm2O3(x = 0–1.6 %) (denoted KNNT–xSm) ceramics. All ceramics have the perovskite structure, and doping with Sm3+ refined the ceramic grains, resulting in an increase in the room-temperature dielectric permittivity from 998 to 1568 at 100 kHz. In addition, the dielectric loss (tanδ) reduced from 0.026 to 0.019, relaxation diffusion coefficient(γ) increased from 1.35 to 1.88, and the activation energy (Ea) was 0.9–1.08eV. Thus, the dielectric and relaxation properties of KNNT ceramic can be significantly improved by Sm3+ doping.

Low-electric-field-induced high electrocaloric properties via defect regulation in samarium-doped BaTiO3 ceramics

A small electrocaloric effect (ECE) is usually observed in aliovalent doped ferroelectric ceramics since decreased polarization is usually present. In this work, the high ECE is achieved in a barium titanate [BaTiO3 (BT)]-based ceramic by introducing defect polarization to enhance the ferroelectric polarization and polarization change. The defect dipoles consisting of donor ion and barium vacancy, or barium and oxygen vacancies were formed in samarium-doped (Ba1−1.5xSmx)TiO3 ceramics. The phase and defect structures, and dielectric and ferroelectric properties are analyzed to confirm the evolution of charge compensation states and defect structures, and the influences of defects on polarization rotation and ECE. An enhanced ferroelectric polarization and high internal bias field are present in the ceramic with a suitable defect dipole effect, leading to a high polarization change before/after applying an electric field, causing an enhanced ECE. Finally, a high electrocaloric temperature change of ∼1.11 K and a large electrocaloric strength of ∼0.037 K·cm kV−1 were achieved under a low electric field of 30 kV/cm, indicating that forming suitable defect dipoles can optimize the ECE. This work provides a significant paradigm for tuning ECE in ferroelectric materials via defect regulation.

Configurational entropy of cerate ceramics regulating by multicomponent rare earth for enhanced thermophysical properties

Cerate is regarded as a promising material for the next-generation of thermal barrier coating due to its high coefficient of thermal expansion (CTE) and low thermal conductivity. However, its thermal contraction within the temperature range of 473-673 K poses a significant challenge to its widespread application. The aim of this work is to improve the thermal contraction by regulating the configurational entropy of cerate ceramics. Six kinds of rare earth doped cerate ceramics with different configurational entropy were prepared. The results indicated that the phases of the as-prepared ceramics are all fluorite structures. With the increase of configurational entropy, the problem of thermal contraction is improved continuously. More importantly, the as-prepared (La1/8Sm1/8Yb1/8Y1/8Er1/8Eu1/8Nd1/8Gd1/8)2Ce2O7 (8RC) high entropy cerate ceramic demonstrates a near elimination of thermal contraction in the 473-673 K temperature range, and accompanied by high CTE, low thermal conductivity and good thermal stability, suggesting its potential application in the field of thermal barrier coating material.

Structural and electrical investigation of rare-earth doped lead-free SrBi4Ti4O15 ceramics

Structural and electrical investigation of rare-earth doped lead-free SrBi4Ti4O15 ceramics

Enhancement mechanisms of self-lubricating Ti3SiC2 ceramic doping in CoCrFeNi high-entropy alloy via high-speed laser cladding: Tribology and electrochemical corrosion

High-entropy alloys (HEAs) are renowned for their superior mechanical properties and corrosion resistance, positioning them as promising materials in the realm of wear and corrosion-resistant applications. In this study, CoCrFeNi HEA coatings were fabricated utilizing the high-speed laser cladding (HLC), and the effects of adding Ti3SiC2 self-lubricating phase on the microstructure, wear resistance, and electrochemical corrosion performance of CoCrFeNi HEA coatings was investigated. The results show that CoCrFeNi HEA coatings synthesized via HLC exhibit an impressively low dilution rate of <0.1 %, while concurrently ensuring a robust metallurgical bond with the substrate. CoCrFeNi coating has an FCC simple solid solution structure. Upon the addition of Ti3SiC2, the composite structure comprises FCC, Ti3SiC2, and TiC phases. The friction coefficients (COFs) of CoCrFeNi coating and the coatings with 3, 6, and 9 at.% Ti3SiC2 content are 0.684, 0.628, 0.429, and 0.426, respectively. Predominantly, the wear mechanisms observed encompass abrasive wear, adhesive wear, and oxidative wear. Intriguingly, when the Ti3SiC2 content reaches 6 at.%, a contiguous self-lubricating layer forms within the wear track, leading to a notable reduction in COF and a marked enhancement in wear resistance. In electrochemical corrosion evaluations, the coatings demonstrated polarization resistances of 11,400, 9923, 9654, and 6125 Ω·cm2, respectively. While Ti3SiC2 exhibits commendable passivation capabilities, an elevated Ti3SiC2 content can expedite corrosion processes by fostering a potential difference battery formation on the coating surface.

Simultaneously significant transparency enhancement and efficient temperature feedback achieved in AlON ceramic through luminescent rare earth doping

Activator-doped aluminum oxynitride (γ-AlON) could provide an extremely versatile transparent ceramic with photothermal feedback, opening the door to many new applications and devices for use in extreme conditions. However, existing AlON transparent ceramics have failed to achieve temperature-responsive luminescence. To address this, a simple-to-implement luminescent rare-earth doping strategy for fabricating AlON transparent ceramic with efficient temperature feedback is proposed and demonstrated. Luminescent Pr2O3 serves as the illustrative example. Benefiting from the liquid phase formed by Pr2O3 and the thermal coupling between the 3P1 and 3P0 levels of Pr3+, AlON ceramics doped with Pr2O3 exhibit significantly elevated transparency and temperature-responsive luminescence. More importantly, the AlON:Pr ceramic can serve as photothermal feedback windows, which presents attractive performance. This paradigm fills an important gap in the AlON transparent ceramics for temperature feedback windows, and will inspire the controllable design of luminescent rare-earth doped AlON ceramics for use in harsh conditions.

Eu3+ doped (Y0.75Sc0.25)2O3 red-emitting ceramics with excellent photoluminescence properties for LEDs

Developing narrow-band red-emitting ceramic phosphors with high quantum yield and low thermal quenching is vital for mid to high powder solid state lighting. In this study, a series of (Y0.75Sc0.25)2O3:Eu3+ ceramics were fabricated and their photoluminescence properties were studied. The spectral measurement suggests that the optimal doping concentration of Eu3+ is as high as 14%. The heavily doped samples show strong absorption in the NUV-blue region (particularly 360–420 nm and 460–475 nm), bright red emission dominated by the sharp peak located at 611 nm, CIE chromaticity coordinates close to the NTSC standard value of red emission, and single exponential photoluminescence decay without afterglow. In particular, ((Y0.75Sc0.25)0.86Eu0.14)2O3 ceramic exhibits high QY of 86.9%, high color purity of 96.9%, and low thermal quenching loss of 16% as the temperature increases from 300 to 570 K. The excellent photoluminescence properties highlight the great potential of Eu3+ heavily doped (Y0.75Sc0.25)2O3 red-emitting ceramics as color converters for solid state lighting, which is demonstrated by the outstanding electroluminescence performance of the fabricated red and white LEDs.

Effect of vacuum sintering on the microstructure and spectroscopic properties of Eu doped strontium titanate ceramics

In this work, we report on the optical properties of europium-doped SrTiO3, synthesized in situ via the sol-gel method as nanopowders and sintered ceramic bulks by heat treatment in vacuum. The structure and morphology of the Sr1-3x/2EuxTiO3 (x = 0.01–0.07) nanopowders and ceramics, concerning to the europium concentration, were characterized by X-ray powder diffraction, field emission scanning electron microscopy, and transmission electron microscopy. The optical properties of as-prepared materials were also investigated. These analyses demonstrated that a temperature of 1425 °C in a vacuum of 10−4 Pa and a plateau of 4h are the optimal sintering conditions for Sr1-3x/2EuxTiO3 ceramics. Eu3+ doped SrTiO3 ceramics exhibit visible red photoluminescence characteristics. The emission of SrTiO3:Eu3+ phosphor with different amounts of Eu3+, excited by 395 nm and 465 nm light, was studied. The emission spectra exhibit characteristic luminescence from 5D0 → 7Fj (j = 0, 1, 2, 3, 4) intra-4f shell Eu3+ ion transitions. The most intense transitions are 5D0 → 7F1 (591 nm) for pumping at 395 nm and, 5D0 → 7F2 (615 nm) at 465 nm. The corresponding coordinates CIE for the Eu-doped SrTiO3 samples were calculated from the emission spectra obtained at 395 nm and 465 nm excitation wavelengths. This study demonstrates that the original protocol of materials engineering used is a simple and efficient method for manufacturing novel nanophosphors with enhanced reddish-orange emission. The as-obtained results indicated that the sol-gel synthesis combined with the sintering process in a vacuum at an appropriate temperature, plateau, could be a novel way to fabricate materials based on strontium titanate with reasonable optical properties.

Tailoring the crystal distortion and dielectric properties of 0.7CaTiO3-0.3NdAlO3 microwave ceramics by La, Sm and Eu doping into A-site Nd

The TiO6 octahedra titling and rotation play an important role in affecting the microwave properties of 0.7CaTiO3-0.3NdAlO3 microwave ceramics by A-site La, Sm and Eu doping. The oxygen octahedra of Sm-doped 0.7CaTiO3-0.3NdAlO3 ceramics exhibit antiphase tilting, while both in-phase and antiphase tilting coexist in the 0.7CaTiO3-0.3EuAlO3 ceramics. There is an undeniable correlation between the crystal distortion and the tolerance factor t. As the tolerance factor t continues to increase, the crystal structure of A-site doped CTNA ceramics changes from both in-phase tilting and antiphase tilting to untilted structure and the TiO6 octahedra exhibits an inclination to tilt around c axis. The weakening bending vibration of the Ti–O(2)-Ti bond results in the increase of the polarization and the damping coefficient of lattice vibration. The dielectric constant (εr) rises to 48 from 43 and Q × f values decrease to 36,000 GHz from 44,800 GHz (measured at 6 GHz). These findings could be used to guide the tailoring of the crystal distortion and microwave dielectric properties of technologically important perovskite 0.7CaTiO3-0.3NdAlO3 based ceramics.

Mechanisms for optimizing the dielectric properties of spinel Li10ZnTi13O32 ceramics by Na+ doping

Herein, the dielectric properties of Na + doped Li10ZnTi13O32 ceramics were investigated by first-principles computational prediction and combined with the solid-phase reaction method. Li9.88Na0.12ZnTi13O32 obtained the best dielectric properties by sintering at 1050 °C for 4 h: εr = 30.01, Q × f = 90,879 GHz (@7.8 GHz), τf = 3.93 ppm/°C. In terms of extrinsic factors, the optimization of the densification, the creation of the second phase TiO2, and the increase of the grain size resulted in better dielectric properties. Intrinsic factors indicate that the weakening of the damping behavior and the increase in the electron cloud density lead to a decrease in the dielectric loss. The increase in ion polarisation and the blue shift of the Raman wavenumber lead to a gradual increase in εr. The temperature stability is optimized depending on the TiO2 content. The optimized Li9.88Na0.12ZnTi13O32 ceramics have unlimited applications in microwave communications.