Dielectric properties and Maxwell-Wagner relaxation of compounds ACu3Ti4O12 (A = Ca,Bi2/3,Y2/3,La2/3) -: art. no. 093703
Dielectric properties and Maxwell-Wagner relaxation of compounds ACu3Ti4O12 (A = Ca,Bi2/3,Y2/3,La2/3) -: art. no. 093703
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DOI：
10.1063/1.2125117
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发表时间：
2005-11-01
影响因子：
3.2
通讯作者：
Hardy, JR
中科院分区：
文献类型：
--
作者：
Liu, JJ;Duan, CG;Hardy, JR
我们研究了化合物ACu(3)Ti(4)O(12)(A=Ca，Bi2/3，Y-2/3，La-2/3)在10(-1)-10(6)HZ和-150-200℃范围内的介电常数和阻抗随频率和温度的变化关系。具体地说，它们都具有类似德拜的弛豫，并且它们的介电常数在很大范围内与频率和温度无关。在阻抗理论中，它们都有两个电学响应，表明有两个不同的贡献。我们将它们归因于陶瓷样品中的颗粒和晶界，并用晶界和晶界处产生的Maxwell-Wagner弛豫解释了介电行为。(C)2005年美国物理研究所。
We have studied the frequency and temperature dependences of permittivity and impedance of the compounds ACu(3)Ti(4)O(12) (A = Ca, Bi-2/3, Y-2/3, La-2/3) in the ranges of 10(-1)-10(6) Hz and -150-200 degrees C. All compounds investigated display similar dielectric properties. Specifically, they all have a Debye-like relaxation and their dielectric constants are independent of frequency and temperature over a wide range. They all have two electrical responses in impedance formalism, indicating that there are two distinct contributions. We attribute them to grains and grain boundaries in the ceramic samples and explain the dielectric behaviors by Maxwell-Wagner relaxation arising at the interfaces between grains and their boundaries. (c) 2005 American Institute of Physics.