Microstructures and microwave dielectric properties of (1 鈭?#xa0;y)La<sub>1鈭?span style='font-style: italic'>xsub>Sm<sub>xsub>(Mg<sub>0.5sub>Sn<sub>0.5sub>)O<sub>3sub>-yCa<sub>0.8sub>Sm<sub>0.4/3sub>TiO<sub>3sub> ceramics
- 作者：Yen-Nien Wang<sup>asup> ; Yih-Chien Chen<sup>bsup><sup> ; sup><sup>EE049@mail.lhu.edu.twsup><sup> ; sup><sup>ycchenncku@yahoo.com.twsup> ; Ya-Dung Pan<sup>csup> ; Wei-Cheng Lee<sup>bsup>
- 关键词：A. Sintering ; C. Dielectric properties ; Ceramic ; X-ray diffraction
- 刊名：Ceramics International
- 出版年：2012
- 期刊代码：13_02728842
- 类别：ms
- 出版时间：May, 2012
- 卷：38
- 期：4
- 页码：3097-3103
- 文件大小：1568 K
摘要
The (1 鈭?#xA0;y)La<sub>1鈭?em>xsub>Sm<sub>xsub>(Mg<sub>0.5sub>Sn<sub>0.5sub>)O<sub>3sub>-yCa<sub>0.8sub>Sm<sub>0.4/3sub>TiO<sub>3sub> ceramics were prepared by the conventional solid-state method. The X-ray diffraction patterns of the La<sub>1鈭?em>xsub>Sm<sub>xsub>(Mg<sub>0.5sub>Sn<sub>0.5sub>)O<sub>3sub> ceramics revealed that La<sub>1鈭?em>xsub>Sm<sub>xsub>(Mg<sub>0.5sub>Sn<sub>0.5sub>)O<sub>3sub> is the main crystalline phase, which is accompanied by a little La<sub>2sub>Sn<sub>2sub>O<sub>7sub> as the second phase. An apparent density of 6.59 g/cm<sup>3sup>, a dielectric constant (蓻<sub>rsub>) of 19.9, a quality factor (Q 脳 f) of 70,200 GHz, and a temperature coefficient of resonant frequency (蟿<sub>fsub>) of 鈭?7 ppm/掳C were obtained when the La<sub>0.97sub>Sm<sub>0.03sub>(Mg<sub>0.5sub>Sn<sub>0.5sub>)O<sub>3sub> ceramics were sintered at 1500 掳C for 4 h. The temperature coefficient of resonant frequency (蟿<sub>fsub>) increased from 鈭?7 to +6 ppm/掳C as y increased from 0 to 0.6 when the (1 鈭?#xA0;y)La<sub>0.97sub>Sm<sub>0.03sub>(Mg<sub>0.5sub>Sn<sub>0.5sub>)O<sub>3sub>-yCa<sub>0.8sub>Sm<sub>0.4/3sub>TiO<sub>3sub> ceramics were sintered at 1500 掳C for 4 h. 0.425La<sub>0.97sub>Sm<sub>0.03sub>(Mg<sub>0.5sub>Sn<sub>0.5sub>)O<sub>3sub>-0.575Ca<sub>0.8sub>Sm<sub>0.4/3sub>TiO<sub>3sub> ceramic that was sintered at 1500 掳C for 4 h had a 蟿<sub>fsub> of 鈭? ppm/ 掳C.