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Vibrational study of A3In2B″O9 (A = Ba, Sr; B″ = U, W) double perovskites

Silva, E. N. ; Ayala, A. P. ; Guedes, I. ; Larregola, S. A. ; Pinacca, R. M. ; Viola, M. del C. ; Pedregosa, J. C.

Journal of Raman spectroscopy, 2009-08, Vol.40 (8), p.1028-1032 [Periódico revisado por pares]

Chichester, UK: John Wiley & Sons, Ltd

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  • Título:
    Vibrational study of A3In2B″O9 (A = Ba, Sr; B″ = U, W) double perovskites
  • Autor: Silva, E. N. ; Ayala, A. P. ; Guedes, I. ; Larregola, S. A. ; Pinacca, R. M. ; Viola, M. del C. ; Pedregosa, J. C.
  • Assuntos: Diffraction ; Disorders ; double perovskites ; FT-IR transmittance ; In-U and In-W oxides ; Infrared ; Perovskites ; Phonons ; Raman scattering ; Symmetry ; Unit cell ; Vibration
  • É parte de: Journal of Raman spectroscopy, 2009-08, Vol.40 (8), p.1028-1032
  • Notas: istex:D87CE6C8CED4D65EF9B1660E804D8F76FE90926D
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  • Descrição: Raman scattering and infrared transmittance techniques were used to investigate the room‐temperature phonon spectra of the polycrystalline Ba3In2UO9, Sr3In2UO9, Ba3In2WO9 and Sr3In2WO9 double perovskites. Although X‐ray diffraction has shown that both Ba3In2UO9 and Ba3In2WO9 crystallize in a disordered cubic (Pm3m − Oh1) structure with one formula unit per unit cell (Z = 1), Raman measurements revealed that both Ba3In2UO9 and Ba3In2WO9 compounds should exhibit a 1:1 ordered domains with Fm3m symmetry, embedded in the Pm3m matrix. Observation of a ν1‐like vibration of the InO6 octahedron reflects the occurrence of a two‐phonon‐like behavior due to the intrinsic occupational disorder at octahedral symmetry sites. Assignment of most of the Raman and infrared phonons is also given. Copyright © 2009 John Wiley & Sons, Ltd. Raman and infrared measurements revealed that both BIUO and BIWO compounds should exhibit a 1:1 ordered domains with Fm3 symmetry, embedded in the Pm3 matrix. Observation of a ν1‐like vibration of the InO6 octahedron reflects the occurrence of a two‐phonon‐like behavior due to the intrinsic occupational disorder at octahedral symmetry sites.
  • Editor: Chichester, UK: John Wiley & Sons, Ltd
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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