Study of the structure and electrical properties of PMN-PNN-PT ceramics near the morphotropic phase boundary

被引：31
作者：
Chen, Y
Zhang, XW [1 ]
Pan, JS
Chen, KP
机构：
[1] Tsing Hua Univ, Dept Mat Sci & Engn, State Key Lab New Ceram & Fine Proc, Beijing 100084, Peoples R China
[2] Tsing Hua Univ, Dept Phys, Beijing 100084, Peoples R China
来源：
JOURNAL OF ELECTROCERAMICS | 2006年 / 16卷 / 02期
基金：
中国国家自然科学基金;
关键词：
relaxor ferroelectrics; morphotropic phase boundary; PMN-PNN-PT; dielectric properties; ferroelectric properties; piezoelectric properties;
D O I：
10.1007/s10832-006-3610-y
中图分类号：
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
A series of Pb(Mg1/3Nb2/3)O-3-Pb(Ni1/3Nb2/3)-O-3-PbTiO3 (PMN-PNN-PT) ceramics with compositions of (1-x)(0.67PMN-0.33PT)-x(0.64PNN-0.36PT) (x = 0.1-0.9) were synthesized using the columbite precursor method. The phase structures, as well as the dielectric and piezoelectric properties of the ceramics were investigated in detail. X-ray diffraction results demonstrate that all the samples possess a pure perovskite structure. It is found that the morphotropic phase boundary (MPB) region of the PMN-PNN-PT ternary system is located near the line connecting the MPBs of the PMN-PT and PNN-PT binary systems. A high value of the maximum dielectric constant (epsilon(m) = 45540, at 1 kHz), together with a high value of the piezoelectric coefficient (d(33) = 780 pC/N), were obtained for the composition x = 0.2. The results show that a partial substitution of PNN-PT for PMN-PT can lead to improved electrical properties in this ternary system.
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页码：109 / 114
页数：6
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