Premium
New crystallographic dielectric phase boundary in K 0.5 Na 0.5 NbO 3 ‐based lead‐free ceramics
Author(s) -
Liang Wenfeng,
Wu Wenjuan,
Xiao Dingquan,
Zhu Jvmu,
Zhu Jianguo,
Wu Jiagang
Publication year - 2011
Publication title -
physica status solidi (rrl) – rapid research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.786
H-Index - 68
eISSN - 1862-6270
pISSN - 1862-6254
DOI - 10.1002/pssr.201105131
Subject(s) - orthorhombic crystal system , phase boundary , tetragonal crystal system , materials science , ceramic , phase transition , dielectric , crystallography , phase (matter) , trigonal crystal system , analytical chemistry (journal) , mineralogy , crystal structure , condensed matter physics , chemistry , metallurgy , optoelectronics , physics , chromatography , organic chemistry
0.979K 0.5 Na 0.5 Nb 1‐ x Sb x O 3 ‐0.021Bi 0.5 Na 0.5 TiO 3 (KNNS x ‐BNT) lead‐free piezoelectric ceramics were fabricated by conventional solid state reaction technique, and their phase transition and electrical properties were studied. With the increase of x , the rhombohedral‐orthorhombic phase transition temperature of the ceramics increases. Finally, both the rhombohedral‐orthorhombic and orthorhombic‐tetragonal phase transitions of the ceramics were modified to be around room tempera‐ ture when about 6% Sb were substituted for the Nb site, resulting in the formation of a new phase boundary separating rhombohedral and tetragonal phases. The formation of the new phase boundary results in excellent properties for the ceramics, that is, the KNNS0.05‐BNT ceramic shows an enhancement in piezoelectric properties: d 33 = 380 pC/N and k P = 0.438. (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)