Enhanced temperature stability in the O–T phase boundary of (K,Na)NbO3‐based ceramics
JOURNAL OF THE AMERICAN CERAMIC SOCIETY(2020)
摘要
In order to obtain excellent electrical properties and its temperature stability of KNN-based ceramics to meet the practical applications, a new lead-free material system of (1-x)K0.5Na0.5Nb0.96Sb0.04O3-xBi(0.5)Na(0.5)Zr(0.8)Sn(0.2)O(3) (KNNS-xBNZS, 0 <= x <= 0.060) was designed, and the enhanced electrical properties (eg, d(33) similar to 465 pC/N, epsilon(r) similar to 3318, S-uni similar to 0.133%) is obtained in the ceramics with x = 0.04. The physical origin of enhanced electric properties should be ascribed to the phase instability of R-T, resulting in a low-energy barrier, which can greatly facilitate the polarization switching. Moreover, the temperature stable of piezoelectric constant (d(33) or d(33)*) is measured by three distinctive methods in different phase boundaries (O, O-T, R-T) at the temperature range 20 degrees C-180 degrees C, revealing that the O-T phase boundary has a relatively good temperature stability. A mode is used to show how to effectively modified the piezoelectric constant (d(33) or d(33)*) and its temperature stability, we believe that such a strategy may further improve the temperature stability of d(33) or d(33)* value in KNN-based ceramics.
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关键词
KNN-based ceramics,phase boundary,piezoelectric constant,temperature stability
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