Microwave dielectric properties of (1 - y)Nd^sub (1-2x/3)^Ba^sub x^(Mg^sub 0.5^Sn^sub 0.5^)O3-yCa^sub 0.8^Sr^sub 0.2^TiO3 ceramic

• Published in: Journal of materials science. Materials in electronics 2013-02, Vol.24 (2), p.819
• Main Authors: Chen, Yih-chien, Chen, Kuei-chien, Wu, Chung-yen
• Format: Article
• Language: English
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-012-0826-2

Issue Title: Featured Issue on Electronic Materials for Solar Energy Generation and Energy Storage The (1 - y)Nd^sub (1-2x/3)^Ba^sub x^(Mg^sub 0.5^Sn^sub 0.5^)O3-yCa^sub 0.8^Sr^sub 0.2^TiO3 ceramics were prepared by the conventional solid-state method. The X-ray diffraction patterns of the Nd^sub (1-2x/3)^Ba^sub x^(Mg^sub 0.5^Sn^sub 0.5^)O3 ceramics revealed that Nd^sub (1-2x/3)^Ba^sub x^(Mg^sub 0.5^Sn^sub 0.5^)O3 is the main crystalline phase, which is accompanied by a little Nd^sub 2^SN2O^sub 7^ as the second phase. An apparent density of 6.89 g/cm^sup 3^, a dielectric constant ([straight epsilon]^sub r^) of 19.1, a quality factor (Q × f) of 212,000 GHz, and a temperature coefficient of resonant frequency (τ^sub f^) of -68 ppm/°C were obtained when the Nd^sub 2.94/3^Ba^sub 0.03^(Mg^sub 0.5^Sn^sub 0.5^)O3 ceramics were sintered at 1,550 °C for 4 h. The temperature coefficient of resonant frequency (τ^sub f^) increased from -68 to +55 ppm/°C as y increased from 0 to 0.7 when the (1 - y)Nd^sub 2.94/3^Ba^sub 0.03^(Mg^sub 0.5^Sn^sub 0.5^)O3-yCa^sub 0.8^Sr^sub 0.2^TiO3 ceramics were sintered at 1,600 °C for 4 h. 0.4Nd^sub 2.94/3^Ba^sub 0.03^(Mg^sub 0.5^Sn^sub 0.5^)O3-0.6 Ca^sub 0.8^Sr^sub 0.2^TiO3 ceramic that was sintered at 1,600 °C for 4 h had a τ^sub f^ of -7 ppm/°C.[PUBLICATION ABSTRACT]