Raman Spectroscopy of Perovskite-Type BaCexZr1−xO3(0≤x≤1)

✍ Scribed by I Charrier-Cougoulic; T Pagnier; G Lucazeau

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 187 KB
• Volume: 142
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1998.8038

✦ Synopsis

Polycrystalline samples of BaCe x Zr 1؊x O 3 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 x Zr 1؊x O 3 exhibits slight x-dependent distortions from the ideal perovskite structure. Indeed the evolution of Raman spectra of BaCe x Zr 1؊x O 3 , as x decreases at room temperature or as temperature increases for a given x value, is similar to the evolution of Raman spectra of BaCeO 3 as temperature increases. These observations lead us to propose a phase diagram in the binary system BaCeO -BaZrO 3 based on the known structures of BaCeO 3 (Pnma, Imma, R3 c, and Pm3m).