High permittivity and low loss dielectric ceramics in the BaO-La2O3-TiO2-Ta2O5 system
High permittivity and low loss dielectric ceramics in the BaO-La2O3-TiO2-Ta2O5 system
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DOI：
10.1016/s0955-2219(02)00372-2
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发表时间：
2003-09-01
影响因子：
5.7
通讯作者：
Zheng, XH
中科院分区：
文献类型：
--
作者：
Chen, XM;Sun, YH;Zheng, XH
在BaO-La_2 O_3-TiO_2-Ta_2 O_5四元体系中合成并表征了三种典型组分的介电陶瓷：Ba_3La_3 Ti_5 Ta_5 O_3 O、Ba_4La_2 Ti_4 Ta_6 O_30和Ba_5La_3 Ti_7 O_30。本发明的陶瓷显示出高介电常数δ（127.7-148.1）和低介电损耗tandelta（在1 MHz下为10（-4）-10（-3）的量级）。同时，在20-85 ℃范围内，随着Ba和Ta浓度的增加以及La和Ti浓度的降低，介电常数温度系数τ（τ）在-728 ~-1347ppm/℃之间变化。目前的陶瓷是有希望的候选人，高介电常数和低损耗的介质陶瓷，和τ（τ）的抑制应是未来工作的首要问题。(C)2003爱思唯尔科技有限公司。保留所有权利。
Dielectric ceramics were synthesized and characterized in the BaO-La2O3-TiO2-Ta2O5 quaternary system for the three typical compositions: Ba3La3Ti5Ta5O3O, Ba4La2Ti4Ta6O30 and Ba5LaTi3Ta7O30, which formed the filled tungsten-bronze structures. The present ceramics indicated high dielectric constant 6 (127.7-148.1) and low dielectric loss tandelta (in the order of 10(-4)-10(-3) at 1 MHz). Meanwhile, the temperature coefficient of dielectric constant tau(epsilon) varied from -728 to -1347 ppm/degreesC with increasing Ba and Ta and decreasing La and Ti concentration in the temperature range of 20-85 degreesC. The present ceramics are promising candidates for high-epsilon and low loss dielectric ceramics, and the suppression of tau(epsilon) should be the primary issue in the future work. (C) 2003 Elsevier Science Ltd. All rights reserved.