Ba5[Nb1-x(Al1/3Mo2/3)x]4O15陶瓷的结构和微波介电性能

doi:10.11896/cldb.23110273

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Abstract With the comprehensive and rapid development of mobile communications, it is urgent to research and develop new microwave dielectric ceramic materials with medium ε_r and high Q value and low frequency temperature coefficient. In this work, (Al_1/3Mo_2/3)⁵⁺ were introduced into the B-site of the deficiency-type hexagonal perovskite ceramic Ba₅Nb₄O₁₅ by solid-phase reaction method to investigate the effects of ion substitution on its phase composition, microstructure and microwave dielectric properties. The analysis shows that the moderate amount of (Al_1/3Mo_2/3)⁵⁺ substitution is favorable for the densification and sintering of Ba₅Nb₄O₁₅ ceramics, however, when the doping amount is too much, the complete solid solution is not formed and the second phase BaMoO₄ appears, which affects the microwave dielectric properties of the ceramic matrix to a certain extent. With increasing substitution, the dielectric constant and Q×f value of Ba₅[Nb_1-x(Al_1/3Mo_2/3)_x]₄O₁₅ ceramics show a decreasing trend, but the composite substitution makes the τ_f value move in the negative direction. When x=0.1, the ceramic samples sintered at 1 385 ℃ have the optimal microwave dielectric properties: ε_r=37, Q×f=10 300 GHz, τ_f=6.5×10^-6/℃. The experimental results show that the modified Ba₅Nb₄O₁₅ ceramic dielectrics can be used as a candidate material for high-reliability mobile communication devices.

Key words： microwave dielectric ceramic Ba₅Nb₄O₁₅ hexagonal perovskite ionic substitution

Published: 25 January 2025 Online: 2025-01-21

CLC number:

TQ174

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	ZHANG Xiaohui
	ZHANG Zhehui
	ZHANG Xiaohua
	MA Shuai
	YUE Zhenxing

Cite this article:

ZHANG Xiaohui,ZHANG Zhehui,ZHANG Xiaohua, et al. Structure and Microwave Dielectric Properties of Ba₅[Nb_1-x(Al_1/3Mo_2/3)_x]₄O₁₅ Ceramics[J]. Materials Reports, 2025, 39(2): 23110273-6.

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https://www.mater-rep.com/EN/10.11896/cldb.23110273 OR https://www.mater-rep.com/EN/Y2025/V39/I2/23110273

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