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Enhanced Ferroelectric Properties of Potassium Sodium Niobate Ceramics Modified by Small Amount of K 3 Li 2 Nb 5 O 15
Author(s) -
Zeng Jiangtao,
Zhang Yanghong,
Zheng Liaoying,
Li Gurong,
Yin Qingrui
Publication year - 2009
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.1551-2916.2008.02921.x
Subject(s) - potassium niobate , curie temperature , orthorhombic crystal system , tetragonal crystal system , analytical chemistry (journal) , ferroelectricity , coercivity , phase transition , mineralogy , natural bond orbital , materials science , ceramic , perovskite (structure) , chemistry , crystal structure , crystallography , dielectric , condensed matter physics , ferromagnetism , metallurgy , density functional theory , physics , computational chemistry , optoelectronics , chromatography
(1− x )K 0.5 Na 0.5 NbO 3 – x K 3 Li 2 Nb 5 O 15 (KNN–100 x KLN) ceramics were prepared by the solid‐state reaction method. The results showed that small amount of KLN ( x ≤0.02) incorporated into the lattice and formed a single phase perovskite structure. The KLN modification lowered the phase transition temperature of orthorhombic–tetragonal ( T O−T ) and increased the Curie temperature ( T c ), but the transition temperatures remained almost unchanged in the range of x from 0.02 to 0.03. Small amount of KLN decreased the amount of defects, thus the remnant polarization increased and the coercive field decreased markedly, and the piezoelectric properties of KNN ceramics modified by small amount of KLN also enhanced markedly.