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The Crystalline Structure and Phase‐Transitional Behavior of (Li 0.12 Na 0.88 )(Nb 1−x% Sb x% )O 3 Lead‐Free Piezoelectric Ceramics with High Q m
Author(s) -
Chen Qiang,
Peng Zhihang,
Liu Hong,
Xiao Dingquan,
Zhu Jiliang,
Zhu Jianguo
Publication year - 2010
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.1551-2916.2010.03813.x
Subject(s) - orthorhombic crystal system , phase boundary , curie temperature , tetragonal crystal system , materials science , perovskite (structure) , ferroelectricity , analytical chemistry (journal) , dielectric , crystal structure , crystallography , mineralogy , phase (matter) , chemistry , condensed matter physics , physics , optoelectronics , organic chemistry , chromatography , ferromagnetism
Lead‐free piezoelectric ceramics with formula (Li 0.12 Na 0.88 ) (Nb 1− x % Sb x % )O 3 were prepared by the conventional solid‐state reaction method. The effects of Sb 5+ doped into (Li 0.12 Na 0.88 ) NbO 3 B site were studied. Within the selected compositional range, all the samples have a single perovskite structure. The crystal structure changed from rhombohedral to orthorhombic at x =1, and from orthorhombic to tetragonal symmetry at x =6. The presence of orthorhombic to tetragonal morphotropic phase boundary was proposed when 3< x <6. By substituting Sb 5+ for Nb 5+ , dielectric property and impedance characteristic were enhanced, but the Curie temperature and the ferroelectricity were decreased. The optimum composition was x =3, for which the maximum value of the mechanical quality factor Q m was as high as 1780, piezoelectric constant d 33 and Curie temperature T c were 45 pC/N and 300°C, respectively.