Morphotropic phase boundary and electrical properties of K1-xNaxNbO3 lead-free ceramics

被引：206
作者：
Dai, Ye-Jing [1 ]
Zhang, Xiao-Wen [1 ]
Chen, Ke-Pi [2 ]
机构：
[1] Tsinghua Univ, Dept Mat Sci & Engn, State Key Lab New Ceram & Fine Proc, Beijing 100084, Peoples R China
[2] N China Elect Power Univ, Minist Educ, Key Lab Condit Monitoring & Control Power Plant, Beijing 102206, Peoples R China
来源：
APPLIED PHYSICS LETTERS | 2009年 / 94卷 / 04期
基金：
中国国家自然科学基金;
关键词：
dielectric polarisation; electromechanical effects; permittivity; piezoceramics; potassium compounds; sintering; sodium compounds; solid-state phase transformations; PIEZOELECTRIC PROPERTIES;
D O I：
10.1063/1.3076105
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
Lead-free K1-xNaxNbO3 ceramics with x=0.48-0.54 were prepared by a conventional solid-state reaction method to investigate the influence of the K/Na ratio on phase structures and electrical properties. The results suggest that a typical morphotropic phase boundary exists at x=0.52-0.525, separating the monoclinic and orthorhombic phases. The sample with the composition near x=0.52 shows the maximum values of the piezoelectric constant (d(33)=160 pC/N) and the electromechanical coupling coefficient (k(t)=47%). The results provide a helpful guidance to consider the optimal ratio of K to Na for designing and developing new (K,Na)NbO3-based ceramics.
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页数：3
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