Low-temperature sintering of zirconia-based ceramic composites for capacitor applications
Kenzhina I.E. Kozlovskiy A.L. Volodina N.O. Shakirzyanov R.I. Garanin Y.A. Maznykh S.A. Makhanov K.M. Tolenova A.U. Begentayev M. Askerbekov S.K. Blynskiy P.A. Zaurbekova Z.A.
September 2025Elsevier Ltd
Ceramics International
2025#51Issue 2133428 - 33440 pp.
The phase composition, microstructure, and dielectric and mechanical properties of zirconia-based composites produced via conventional ceramic processing at sintering temperatures of 1000 °C and 1100 °C were investigated. To decrease the sintering temperature 5 wt% CuO-TiO2-Nb2O5 additive were introduced in ZrO2 - MgO and ZrO2 - CeO2 powders. X-ray powder diffraction showed that the ceramic composite consisted mostly of the monoclinic phase of ZrO2, with minor amounts of additional CTN-related phases. Scanning electron microscopy revealed that samples sintered at 1000 °C exhibited minimal grain growth, indicating that this temperature was insufficient to promote substantial grain-neck formation, grain-boundary diffusion, or coarsening of the microstructure. With an increase in processing temperature to 1100 °C, improved densification, mechanical, and dielectric properties were observed. The samples sintered at T = 1100 °C exhibited apparent densities close to the theoretical values of monoclinic ZrO2, and their hardness was comparable to that of conventional ceramics used in MLCC, which are usually sintered at temperatures ∼1500 °C. Dielectric spectroscopy results indicate that the developed approach leads to the sintering of low-loss dielectric material with ε’ = 20 and tan δ = 0.003–0.04 in the frequency range of 2–200 000 Hz. Moreover, temperature measurements of dielectric properties showed stable permittivity across wide temperature range, which allows defining the fabricated material as U8N (capacitance drift: 7500 ± 2500 ppm/°C) or S8K (capacitance drift: 3300 ± 250 ppm/°C) codes of the Electronic Industries Alliance (EIA) standards. Considering the high breakdown voltage of zirconia, low losses, and low processing temperatures, the obtained composites are ready to be used in electronics applications.
Dielectric , Liquid phase sintering , MLCC , Zirconia
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Satbayev University, Satbayev str.22, Almaty, 050000, Kazakhstan
Kazakh-British Technical University, Tole bi 59 str, Almaty, 050000, Kazakhstan
Institute of Experimental and Theoretical Physics, al-Farabi Kazakh National University, al-Farabi av. 71, Almaty, 050040, Kazakhstan
Engineering Profile Laboratory, L.N. Gumilyov Eurasian National University, Satpayev St. 2, Astana, 010008, Kazakhstan
Satbayev University
Kazakh-British Technical University
Institute of Experimental and Theoretical Physics
Engineering Profile Laboratory
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