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Ferroelectric Properties of Pb(Zn 1/3 Nb 2/3 )O 3 –PbTiO 3 –RNbO 3 (R=Na, K) Ceramics
Author(s) -
Park JongSung,
Lee JungKun,
Park Hyunmin,
Hong Kug Sun
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.1551-2916.2007.01917.x
Subject(s) - ferroelectricity , materials science , dielectric , tetragonal crystal system , solid solution , ceramic , analytical chemistry (journal) , piezoelectricity , mineralogy , crystallography , crystal structure , chemistry , composite material , metallurgy , optoelectronics , chromatography
We investigate the ferroelectric properties of Pb(Zn 1/3 Nb 2/3 )O 3 –PbTiO 3 (PZN–PT)‐based ceramics, which are stabilized by adding a small amount of NaNbO 3 (NN) and KNbO 3 (KN). As the content of alkali niobate increased, the ferroelectric properties of Pb(Zn 1/3 Nb 2/3 )O 3 –PbTiO 3 –RNbO 3 (PZN–PT–RN; R=Na, K) became softer, which was more pronounced in PZN–PT–KN. The difference in the piezoelectric properties between PZN–PT–KN and PZN–PT–NN was explained by the cation size effect. Because the ionic size of Na is smaller than that of K, the Na ion can retain the ferroelectricity of the solid solution more effectively. The field‐induced strain of 85PZN–5PT–10NN under 10 kV/cm was as high as 0.1%. Also, the addition of NN increased the tunability of dielectric constant significantly. At a composition of 85PZN–5PT–20NN, the tunability was 90% and no hysteresis was observed. In contrast to RN, the increase in the content of PT caused the transition from relaxor to normal ferroelectrics, which were accompanied by the structural change from the rhombohedral to tetragonal phase.