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

被引：207

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.

引用

页数：3

共 16 条

[1]

Dai YJ, 2007, APPL PHYS LETT, V90, DOI 10.1063/1.2751607

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