New Dielectric Material System of La(Mg_(1/2)Ti_(1/2))O_3-CaTiO_3 at Microwave Frequencies

Cheng-Liang HUANG; Yuan-Bin CHEN; Ching-Wen LO

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New Dielectric Material System of La(Mg_(1/2)Ti_(1/2))O_3-CaTiO_3 at Microwave Frequencies

机译：微波频率下La（Mg_（1/2）Ti_（1/2））O_3-CaTiO_3的新介电材料体系

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摘要

The dielectric characteristics and microstructures of xLa(Mg_(1/2)Ti_(1/2))O_3-(1 - x)CaTiO_3 ceramics with B_2O_3 additive (0.25 wt%) prepared by the conventional solid-state method were investigated. Doping with B_2O_3 (0.25 wt%) effectively improves the densification and the dielectric characteristics of xLa(Mg_(1/2)Ti_(1/2))O_3-(1 - x)CaTiO_3 ceramics. xLa(Mg_(1/2)Ti_(1/2))O_3-(1 - x)CaTiO_3 ceramics can be sintered at 1400℃ because of the liquid phase effect of B_2O_3 addition observed by scanning electron microscopy. At 1450℃, 0.5La(Mg_(1/2)Ti_(1/2))O_3-0.5CaTiO_3 ceramics with 0.25 wt% B_2O_3 additive have a dielectric constant (ε_r) of 43, a Q x f value of 24470 (at 8 GHz) and a temperature coefficient of resonant frequency (τ_f) of -8.94 ppm/℃. As the content of La(Mg_(1/2)Ti_(1/2))O_3 increases, the highest Q x f value of 38000 (GHz) for x = 0.7 is achieved at the sintering temperature of 1475℃.

机译：研究了通过常规固态法制备的含B_2O_3添加剂（0.25 wt％）的xLa（Mg_（1/2）Ti_（1/2）Ti_（1/2）O_3-（1-x）CaTiO_3陶瓷的介电特性和微观结构。掺杂B_2O_3（0.25 wt％）有效地改善了xLa（Mg_（1/2）Ti_（1/2））O_3-（1-x）CaTiO_3陶瓷的致密化和介电特性。 xLa（Mg_（1/2）Ti_（1/2））O_3-（1-x）CaTiO_3陶瓷可以通过1400℃烧结，这是由于通过扫描电子显微镜观察到的B_2O_3添加的液相效应。在1450℃下，添加了0.25 wt％B_2O_3的0.5La（Mg_（1/2）Ti_（1/2））O_3-0.5CaTiO_3陶瓷的介电常数（ε_r）为43，Q xf值为24470（8 GHz），谐振频率温度系数（τ_f）为-8.94 ppm /℃。随着La（Mg_（1/2）Ti_（1/2））O_3含量的增加，在1475℃的烧结温度下，x = 0.7时，最高Q x f值为38000（GHz）。

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来源
《Japanese Journal of Applied Physics. Part 1, Regular Papers & Short Notes》 |2005年第5a期|p.3147-3150|共4页
作者
Cheng-Liang HUANG; Yuan-Bin CHEN; Ching-Wen LO;
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作者单位

Department of Electrical Engineering, National Cheng Kung University, 1 University Rd., Tainan 70101, Taiwan, R.O.C.;

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原文格式 PDF
正文语种 eng
中图分类应用物理学;
关键词
ceramics; microwave dielectric properties; X-ray diffraction; dielectric properties;

机译：陶瓷;微波介电性能;X射线衍射;介电性能;

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New Dielectric Material System of La(Mg_(1/2)Ti_(1/2))O_3-CaTiO_3 at Microwave Frequencies

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