Role of Extrinsic Contribution to Temperature Stability of Piezoelectricity for (K,Na)NbO 3 -(Bi,M)ZrO 3 Ceramics with Morphotropic Phase Boundary

Gyoung-Ja Lee and Min-Ku Lee
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Gyoung-Ja Lee: Sensor System Research Team, Korea Atomic Energy Research Institute, Daejeon 34057, Korea
Min-Ku Lee: Sensor System Research Team, Korea Atomic Energy Research Institute, Daejeon 34057, Korea

Energies, 2020, vol. 13, issue 8, 1-9

Abstract: Temperature stability of dielectric, ferroelectric, and piezoelectric properties were investigated in situ by choosing (K,Na)NbO 3 -(Bi,K)ZrO 3 (KNN-BKZ), (K,Na)NbO 3 -(Bi,Na,K,Li)ZrO 3 (KNN-BNKLZ), and (K,Na)NbO 3 -(Bi,Li)ZrO 3 -(KNN-BLZ) as representative ceramics with rhombohedral-orthorhombic-tetragonal (R-O-T), R-T, and enriched T phase boundaries, respectively. The KNN-BNKLZ ceramics, which have an R-T phase boundary, showed the highest piezoelectricity but the worst temperature stability. On the other hand, the KNN-BLZ ceramics, which have an enriched T-phase, were slightly worse in terms of piezoelectricity compared to the R-O-T or R-T phase boundary, but their thermal stability was the best. From analyses of an extrinsic contribution by a difference between the small signal d 33 and ε r P r and an intensity variation of the (002) and (200) X-ray diffraction peaks for the KNN-based ceramics, it was suggested that increasing the extrinsic contribution in the morphotropic phase boundary region improves the piezoelectricity but decreases the thermal stability.

Keywords: lead-free; piezoelectric ceramics; morphotropic phase boundary; temperature stability; extrinsic contribution (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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