Preparation and Microwave Dielectric Properties of xBaZn₂Ti₄O₁₁-(1-x)BaNd₂Ti₄O₁₂ Ceramics

Abstract:

xBaZn₂Ti₄O₁₁–(1-x)BaNd₂Ti₄O₁₂ (x = 0.18–0.30) ceramics were prepared by solid-state reaction method and their microwave dielectric properties were investigated with the purpose of finding a microwave ceramics with high dielectric constant (ε_r), high quality factor (Q×f ) and zero temperature coefficient of resonant frequency (τ_f).The two phase system BaZn₂Ti₄O₁₁–BaNd₂Ti₄O₁₂ affected the unit cell volume and the microstructure, the microwave dielectric properties (ε_r, Q×f, τ_f). As increasing x from 0.18 to 0.30, the main phase composition was BaNd₂Ti₄O₁₂. Therefore, the ε_r decreased from 64.9 to 60.3 and the Q×f values raised from 11,350GHz to 13,210GHz, and the τ_f values decreased from 7ppm/° to -5ppm/°.The 0.22BaZn₂Ti₄O₁₁–0.78BaNd₂Ti₄O₁₂ ceramics sintered at 1250°C for 4 h displayed the best dielectric constant ε_r,Q×f and τ_f, as 63.9, 12380 GHz and-0.1 ppm/° respectively.

• Periodical: Key Engineering Materials (Volume 726)
• Pages: 210-214
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.726.210
• Online since: January 2017
• Authors: Xu Wang, Ren Li Fu*, Yue Xu, Yang Yang, Jun De Cai, Ju Hua Luo
• Keywords: High Dielectric Constant, Microwave Ceramic, Zero Temperature Coefficient

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