| Title: | Phase transition and failure at high temperature of bismuth-layered piezoelectric ceramics | Authors: | Zheng, L Li, G Yin, Q Kwok, KW |
Issue Date: | 2006 | Source: | Journal of the American Ceramic Society, 2006, v. 89, no. 4, p. 1317-1320 | Abstract: | High-temperature bismuth-layered piezoelectric ceramics (Ca xSr1-x)Bi4Ti4O15 have been prepared by the conventional solid reaction method. Our results reveal that there is a "phase transition induced by the composition" taking place in the solid solution at around x=0.4. During transition, the crystal structure changes from orthorhombic to pseudo-tetragonal and then back to orthorhombic. Although all (CaxSr1-x)Bi4Ti4O 15 (with any x value) undergo a second-order ferroelectric-to- ferroelectric phase transition at about 200°C below their Curie temperature, only the ceramic with x=0.4 exhibits a failure in piezoelectric properties during the transition. It is suggested that, on the basis of the X-ray photoelectron spectroscopy results, this material failure is induced by the high concentration of oxygen vacancies in the material during the phase transition. | Publisher: | Wiley-Blackwell | Journal: | Journal of the American Ceramic Society | ISSN: | 0002-7820 | EISSN: | 1551-2916 | DOI: | 10.1111/j.1551-2916.2005.00866.x |
| Appears in Collections: | Journal/Magazine Article |
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