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

Author： Charrier-Cougoulic I. Pagnier T. Lucazeau G.

Publisher： Academic Press

ISSN： 0022-4596

Source： Journal of Solid State Chemistry, Vol.142, Iss.1, 1999-01, pp. : 220-227

Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.

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Abstract

Polycrystalline samples of BaCe_xZr_1-xO₃ were 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-xO₃ exhibits slight x-dependent distortions from the ideal perovskite structure. Indeed the evolution of Raman spectra of BaCe_xZr_1-xO₃, as x decreases at room temperature or as temperature increases for a given x value, is similar to the evolution of Raman spectra of BaCeO₃ as temperature increases. These observations lead us to propose a phase diagram in the binary system BaCeO₃–BaZrO₃ based on the known structures of BaCeO₃ (Pnma, Imma, R3c, and Pm3m).

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