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Rhombohedral–Tetragonal Phase Coexistence and Piezoelectric Properties of (NaK)(NbSb)O 3 –LiTaO 3 –BaZrO 3 Lead‐Free Ceramics
Author(s) -
Zuo Ruzhong,
Fu Jian
Publication year - 2011
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.1551-2916.2010.04256.x
Subject(s) - phase boundary , tetragonal crystal system , materials science , ferroelectricity , piezoelectricity , orthorhombic crystal system , phase diagram , phase transition , phase (matter) , ceramic , mineralogy , dielectric , atmospheric temperature range , ternary operation , crystallography , condensed matter physics , crystal structure , chemistry , thermodynamics , composite material , physics , organic chemistry , computer science , optoelectronics , programming language
The phase transitional behavior and composition‐dependent piezoelectric properties of (NaK)(NbSb)O 3 –LiTaO 3 –BaZrO 3 (NKNS–LT–BZ) pseudo‐ternary system were investigated. A composition–temperature phase diagram was generalized within a certain range of BZ content in which a rhombohedral–tetragonal ( R – T ) ferroelectric phase boundary connecting orthorhombic and cubic phase zones is formed near room temperature between two trifurcate points. Piezoelectric and electromechanical properties of NKNS–LT–BZ ceramics exhibit optimum values of d 33 =365 pC/N and k p =45% in the vicinity of the R – T phase coexistence zone. The dielectric and ferroelectric properties and the phase transition of NKNS–LT–BZ ceramics were discussed from a crystallographic point of view.