Premium
Piezoelectric properties and thermal stability of (Na 0.53 K 0.47− x Ag x )Nb 1− x Sb x O 3 ceramics
Author(s) -
Zheng Limei,
Wang Jinfeng,
Wu Qingzao,
Zhang Rui,
Wang Chunming,
Gai Zhigang
Publication year - 2011
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201026444
Subject(s) - orthorhombic crystal system , materials science , tetragonal crystal system , ceramic , thermal stability , piezoelectricity , analytical chemistry (journal) , phase transition , mineralogy , crystallography , condensed matter physics , crystal structure , chemistry , metallurgy , physics , composite material , organic chemistry , chromatography
Many (K 1− x Na x )NbO 3 (KNN)‐based ceramics with high piezoelectric performance exhibit undesirable strong temperature dependence due to the orthorhombic–tetragonal polymorphic phase transition near room temperature. In order to improve the temperature stability of the ceramics, many additives have been added into the KNN‐based ceramics to shift T O–T down to below room temperature. Contrary to the previous approach (Na 0.53 K 0.47− x Ag x )Nb 1− x Sb x O 3 (NKANS) ceramics with T O–T well above room temperature have been prepared by a conventional solid‐state reaction method. The density and the electrical properties are effectively improved by the addition of AgSbO 3 , and optimum piezoelectric properties are found in the ceramics with 0.05 ≤ x ≤ 0.07, with maximum k p ∼ 0.46 for NKANS5 and maximum d 33 ∼ 199 pC/N for NKANS7. More importantly, k p remains virtually almost unchanged up to the T O–T temperature (≥100 °C), indicating that the NKANS ceramics exhibit a much improved piezoelectric thermal stability. The analyses suggest that both the high T O–T value and diffuse orthorhombic–tetragonal phase transition should be responsible for the good temperature stability.