Composition Inhomogeneity due to Alkaline Volatilization in Li-Modified (K, Na)NbO3 Lead-Free Piezoceramics

被引：64

作者：

Cheng, Li-Qian ^{[1
]}

Wang, Ke ^{[1
]}

Yao, Fang-Zhou ^{[1
]}

Zhu, Fangyuan ^{[1
]}

Li, Jing-Feng ^{[1
]}

机构：

[1] Tsinghua Univ, Sch Mat Sci & Engn, State Key Lab New Ceram & Fine Proc, Beijing 100084, Peoples R China

来源：

JOURNAL OF THE AMERICAN CERAMIC SOCIETY | 2013年 / 96卷 / 09期

关键词：

PIEZOELECTRIC PROPERTIES; SINTERING BEHAVIOR; PHASE-TRANSITION; CERAMICS; MICROSTRUCTURE; TEMPERATURE; SPECTRA;

D O I：

10.1111/jace.12497

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：

Alkaline volatilization during sintering in (K, Na)NbO3 (KNN)-based lead-free piezoceramics is a problem that causes non-stoichiometry and hence affects the phase structures and properties. This work investigated the depth-dependent distributions of alkaline elements in Li-modified KNN ceramics using X-ray photoelectron spectroscopy and Raman spectroscopy. It was found that Li evaporated more severely than Na and K, consequently almost no Li elements remained on the as-sintered surface, while its content became stable at the depth over 55m from the outmost surface. In addition, X-ray diffraction results suggested the phase structure might show discrepancy at the pellet surface and the interior part due to the textured surface grains.

引用

页码：2693 / 2695

页数：3

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