Structure and characterization of B₂O₃ modified yNd(Mg_1/2Ti_1/2)O₃-(1-y)Ca_0.8Sr_0.2TiO₃ ceramics with a near-zero temperature coefficient at microwave frequency

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• 作者：Shih-Hung Lin^a ; Yuan-Bin Chen^b ; ^{cubnck@yahoo.com.tw}
• 关键词：Ceramics ; Near-zero ; Sintering ; Grain size ; Microwave properties
• 刊名：Ceramics International
• 出版年：2017
• 出版时间：1 February 2017
• 年：2017
• 卷：43
• 期：2
• 页码：2368-2371
• 全文大小：870 K
• 卷排序：43

文摘

The microstructure and microwave dielectric properties of the yNd(Mg1/2Ti1/2)O3-(1-y)Ca0.8Sr0.2TiO3 ceramics system with B2O3 addition (1 wt%) prepared using the conventional solid-state route were studied. Microwave measurements show an increase in the dielectric constant (εr) and temperature coefficient of the resonant frequency (τf) and a decrease in the quality factor (Q×f) with decreasing Nd(Mg1/2Ti1/2)O3 content. The 1 wt% B2O3 addition for 0.7Nd(Mg1/2Ti1/2)O3-0.3Ca0.8Sr0.2TiO3 ceramics sintered at 1375 °C show εr of 39, a Q×f value of 27000 (at 8 GHz), and a near -zero τf (~ −0.4 ppm/°C). As the content of Nd(Mg1/2Ti1/2)O3 increases to y=0.9, the highest Q×f value of 35,000 (GHz) can be observed under 1375 °C sintered temperature.