Raman Spectroscopy of Perovskite-Type BaCe_xZr_1−xO₃(0≤x≤1)

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• 作者：Charrier-Cougoulic ; I. ; Pagnier ; T. ; Lucazeau ; G.
• 刊名：Journal of Solid State Chemistry
• 出版年：1999
• 期刊代码：130_00224596
• 类别：ch
• 出版时间：January, 1999
• 卷：142
• 期：1
• 页码：220-227
• 文件大小：187 K

摘要

Polycrystalline samples of BaCe_xZr_1−xO₃were prepared by solid state reaction. X-ray diffraction measurements show that all compounds are single-phase and XRD patterns can be indexed on the basis of the ideal perovskite structure. However, Raman data show that BaCe_xZr_1−xO₃exhibits slightx-dependent distortions from the ideal perovskite structure. Indeed the evolution of Raman spectra of BaCe_xZr_1−xO₃, asxdecreases at room temperature or as temperature increases for a givenxvalue, is similar to the evolution of Raman spectra of BaCeO₃as temperature increases. These observations lead us to propose a phase diagram in the binary system BaCeO₃–BaZrO₃based on the known structures of BaCeO₃(Pnma, Imma, Rc, andPm3m).