Structure, Infrared Reflectivity and Microwave Dielectric Properties of (Na0.5La0.5)MoO4-(Na0.5Bi0.5)MoO4 Ceramics

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• 作者：Wen-Bo Li ; Di Zhou ; Hai-Hong Xi ; Li-Xia Pang and Xi Yao
• 刊名：Journal of the American Ceramic Society
• 出版年：2016
• 出版时间：June 2016
• 年：2016
• 卷：99
• 期：6
• 页码：2083-2088
• 全文大小：1453K
• ISSN：1551-2916

文摘

A series of temperature-stable microwave dielectric ceramics, (1−x)(Na_0.5La_0.5)MoO₄–x(Na_0.5Bi_0.5)MoO₄ (0.0 ≤ x ≤ 1.0) were prepared by using solid-state reaction. All specimens can be well sintered at temperature of 580°C–680°C. Sintering behavior, phase composition, microstructures, and microwave dielectric properties of the ceramics were investigated. X-ray diffraction results indicated that tetragonal scheelite solid solution was formed. Microwave dielectric properties showed that permittivity (ε_r) and temperature coefficient of resonant frequency (τ_f) were increased gradually, while quality factor (Q × f) values were decreased, at the x value was increased. The 0.45(Na_0.5La_0.5)MoO₄–0.55(Na_0.5Bi_0.5)MoO₄ ceramic sintered at 640°C with a relative permittivity of 23.1, a Q × f values of 17 500 GHz (at 9 GHz) and a near zero τ_f value of 0.28 ppm/°C. Far-infrared spectra (50–1000 cm⁻¹) study showed that complex dielectric spectra were in good agreement with the measured microwave permittivity and dielectric losses.