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Diffuse phase transition and dielectric tunability of Ba(ZryTi1-y)O3 relaxor ferroelectric ceramics
Barium zirconate titanate Ba(ZryTi1-y)O3 (BZT, y = 0.2, 0.25, 0.30, 0.35) ceramics have been prepared by a sol-gel process. The temperature dependence of dielectric permittivity of the ceramics has been investigated. The results show that the phase transition temperature TC (or Tm) is suppressed wit...
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Published in: | Acta materialia 2004-10, Vol.52 (17), p.5177-5183 |
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Main Authors: | , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | Barium zirconate titanate Ba(ZryTi1-y)O3 (BZT, y = 0.2, 0.25, 0.30, 0.35) ceramics have been prepared by a sol-gel process. The temperature dependence of dielectric permittivity of the ceramics has been investigated. The results show that the phase transition temperature TC (or Tm) is suppressed with increasing Zr content. The degree of diffuseness of the phase transition is more pronounced for higher Zr content, implying the existence of a composition-induced diffuse phase transition of the ceramics with 0.20 < or = y < or = 0.35. For BZT ceramics with y > 0.25, a relaxor ferroelectric characteristic is observed. High tunability and figure of merit are obtained in BZT compositions investigated, which imply that these ceramics are promising materials for tunable capacitor applications. |
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ISSN: | 1359-6454 1873-2453 |
DOI: | 10.1016/j.actamat.2004.07.028 |