Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/20508
Title: Microstructure, electrical properties, and electric field-induced phase transitions in NaNbO3-LiTaO3 lead-free ceramics
Authors: Sun, H
Zheng, Q
Wan, Y
Li, Q
Chen, Y
Wu, X
Kwok, KW 
Chan, HWLW 
Lin, D
Keywords: Ceramics
Ferroelectric properties
Niobates
Phase transitions
Tantalates
Issue Date: 2014
Publisher: Wiley-VCH
Source: Physica status solidi. A, Applications and materials science, 2014, v. 211, no. 4, p. 869-876 How to cite?
Journal: Physica status solidi. A, Applications and materials science 
Abstract: Lead-free ceramics (1-x)NaNbO3-xLiTaO3 were synthesized by an ordinary solid-state reaction method. Rietveld analysis reveals that the crystal structure changes from one orthorhombic phase with Pbcm space group to another orthorhombic phase with P2221 space group when increasing x. The morphotropic phase boundary between two different orthorhombic symmetries is formed at 0.14 < x < 0.18. Excess LiTaO 3 causes an abnormal grain growth behavior. The pure NaNbO 3 presents four current peaks in the I-E loop, indicating electric-field-induced transitions. A low LiTaO3 doping induces ferroelectricity in the initially antiferroelectric (AFE) NaNbO3. Enhanced ferroelectricity is obtained at x = 0.02-0.12. The addition of LiTaO3 makes the ceramics undergo a transition from an antiferroelectricity dominant to a ferroelectricity dominant phase state. The optimum d33, kp, Qm, and Pr values of 46 pC/N, 18.3%, 1333, and 27.1 μC cm-2 are obtained when x equals 0.12, and the ceramic exhibits good temperature stability because of its high TC.
URI: http://hdl.handle.net/10397/20508
ISSN: 1862-6300
EISSN: 1862-6319
DOI: 10.1002/pssa.201330252
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