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Effect of Changing Na/K Ratio on Structure and Electrical Properties of (Na x K y ) (Nb 0.885 Sb 0.08 )–0.035LiTaO 3 Lead‐Free Piezoelectric Ceramics
Author(s) -
Kang Yan,
Zhao Yuzhen,
Huang Rongxia,
Zhao Yongjie,
Zhou Heping
Publication year - 2011
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2011.04558.x
Subject(s) - piezoelectricity , sintering , ceramic , materials science , calcination , mineralogy , analytical chemistry (journal) , grain size , crystal structure , chemical composition , lead (geology) , chemistry , composite material , crystallography , chromatography , geomorphology , geology , biochemistry , organic chemistry , catalysis
(Na x K y ) (Nb 0.885 Sb 0.08 )–0.035LiTaO 3 lead‐free piezoelectric ceramics (N x K y NS–LT) with an excessive amount of Na or K were synthesized by conventional solid‐state processes. Effects of Na/K ratio on structure and electrical properties of N x K y NS–LT ceramics were investigated. Excessive Na or K did not change the major crystal structure and barely influenced the sintering temperature, but excessive Na or K exhibited effects on grain size. Better piezoelectric properties of the ceramics were achieved when a certain amount of excessive K was added (the Na/K ratio before calcining was adjusted to 0.520:0.450). X‐Ray fluorescence was used to examine the cause, and the enhanced properties are attributed to the formation of an MPB‐like composition when the Na/K was changed. Specimens with properties of d 33 =183 pC/N, k p =0.33, Q m = 103 were obtained in this work.