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Microstructures and Piezoelectric Properties in the Li 2 O‐Excess 0.95(Na 0.5 K 0.5 )NbO 3 –0.05LiTaO 3 Ceramics
Author(s) -
Kim MinSoo,
Jeong SoonJong,
Song JaeSung
Publication year - 2007
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.1551-2916.2007.01893.x
Subject(s) - sintering , materials science , natural bond orbital , microstructure , nucleation , ceramic , piezoelectricity , mineralogy , abnormal grain growth , analytical chemistry (journal) , grain growth , grain size , solid solution , composite material , metallurgy , chemistry , density functional theory , computational chemistry , organic chemistry , chromatography
As a candidate for lead‐free piezoelectric materials, Li 2 O‐excess 0.95(Na 0.5 K 0.5 )NbO 3 –0.05LiTaO 3 (NKN–5LT) ceramics were developed by a conventional sintering process. The sintering temperature was lowered by adding Li 2 O as a sintering aid. Abnormal grain growth in NKN–5LT ceramics was observed with varying Li 2 O content. This grain‐growth behavior was explained in terms of interface reaction‐controlled nucleation and growth. In the 1 mol% Li 2 O excess NKN–5LT samples sintered at 1000°C for 4 h in air, the electromechanical coupling factor and the piezoelectric constant of NKN–5LT ceramics were found to reach the highest values of 0.37 and 250 pC/N, respectively.