Enhanced temperature stability in the R–T phase boundary with dominating intrinsic contribution
Literature Information
Xiang Lv, Jiagang Wu, Jianguo Zhu, Dingquan Xiao
In this study, 0.96KNNSx–0.01SZ–0.03BNZ ceramics (x = 0–0.08) were used as examples to illustrate the effects of phase boundaries on strain property and temperature stability. The addition of Sb5+ resulted in a rhombohedral–tetragonal (R–T) phase boundary at x = 0.05–0.07, as confirmed by temperature-dependent Raman spectra. In the R–T region, an improved piezoelectric constant (d33 = 390–440 pC N−1) and high unipolar strain (Suni = 0.14–0.15%) were observed due to the dominating intrinsic contribution. More importantly, a favorable temperature stability of Suni was observed in the ceramics with x = 0.05; for example, there was a slight variation of +5% to −13% when the temperature was increased from 20 °C to 180 °C. Through systematic investigations of composition and temperature-dependent strain, methods to improve Suni and consolidate its temperature stability in KNN-based ceramics were subsequently suggested. We believe that this study can promote the understanding and design of KNN-based ceramics with high strain and favorable temperature stability.
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