Transition in temperature scaling behaviors and super temperature stable polarization in BiScO3–PbZrO3–PbTiO3 system

• Published in: Journal of the American Ceramic Society Vol. 103; no. 6; pp. 3691 - 3697
• Main Authors: Hu, Querui, Yang, Ying, Li, Ling, Wang, Yiping, Chen, Lang, Yuan, Guoliang, Zhang, Shantao
• Format: Journal Article
• Language: English
• Published: Columbus Wiley Subscription Services, Inc 01.06.2020
• Subjects: Composition; ferroelectric hysteresis; Ferroelectric materials; Ferroelectricity; high temperature applications; Lead titanates; morphotropic phase boundary; Piezoelectric ceramics; Piezoelectricity; Polarization characteristics; power-law relation; Temperature dependence; Ternary systems
• ISSN: 0002-7820; 1551-2916
• DOI: 10.1111/jace.17074

Temperature scaling of dynamic ferroelectric hysteresis for the morphotropic phase boundary (MPB) compositions in xBiScO3–(1‐x‐y)PbZrO3–yPbTiO3 (xBS–(1‐x‐y)PZ–yPT, 0.018 ≤ x ≤ 0.264) ternary system was systematically investigated. The power‐law relation was obtained for remanent polarization Pr and temperature T, that is, Pr ∝ Tβ. It is interesting to find that the power‐law exponent β could be modulated by BiScO3 content x. With the increase of x from 0.018 to 0.264, β varies from −1.09398 to 2.44147. Transition of β from negative to positive produces in the vicinity of 0.054BS–0.476PZ–0.470PT ceramic. At this composition, the magnitude of β is very close to zero with value of only −0.01567, implying an almost temperature‐independent polarization characteristic of the ceramic. Comparing with the conventional PZT‐based piezoelectric ceramics that usually with negative exponent β, when x > 0.054, the xBS–(1‐x‐y)PZ–yPT ceramics show positive β value, so that the ferroelectric polarization is enhanced with increasing temperature. Such a positive temperature dependence of ferro‐/piezoelectric property makes the ternary system a promising candidate for high‐temperature applications.