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Effect of Na excess on the dielectric and piezoelectric properties of (Na 0.53 K 0.47 )(Nb 0.55 Ta 0.45 )O 3 ceramics
Author(s) -
Kim Jin Soo,
Lim Sang Yun,
Ryu Gyung Hyun,
Hussain Ali,
Song Tae Kwon,
Park Tae Gone,
Park Jongkyu,
Kim Won Jeong,
Kim Myong Ho
Publication year - 2014
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201330570
Subject(s) - dielectric , piezoelectricity , materials science , analytical chemistry (journal) , optoelectronics , composite material , chemistry , chromatography
Na‐excess (Na 0.53+ x K 0.47 )(Nb 0.55 Ta 0.45 )O 3 ceramics ( x = 0.0, 0.005, 0.01, 0.015, 0.02, and 0.03) were prepared through the solid‐state reaction method. The effects of Na excess and Ta substitution on dielectric behaviors and piezoelectric properties were investigated. Crystallized single phases were confirmed using X‐ray diffraction. In particular, the orthorhombic–tetragonal polymorphic phase‐transition temperature ( T O–T ) was observed near room temperature, and the piezoelectric properties were enhanced, even for small Na excesses and Ta substitution. The optimized piezoelectric coefficient d 33 and planar electromechanical coupling coefficient k p were estimated to be 320–340 pC/N and 0.36, respectively.