Crystal structures and phonon modes of Ba(Ca1/2W1/2)O3, Ba(Ca1/2Mo1/2)O3 and Ba(Sr1/2W1/2)O3 complex perovskites investigated by Raman scattering.

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MetadadosDescriçãoIdioma
Autor(es): dc.creatorDias, Anderson-
Autor(es): dc.creatorSiqueira, Kisla Prislen Félix-
Autor(es): dc.creatorMoreira, Roberto Luiz-
Data de aceite: dc.date.accessioned2025-08-21T15:48:12Z-
Data de disponibilização: dc.date.available2025-08-21T15:48:12Z-
Data de envio: dc.date.issued2017-05-18-
Data de envio: dc.date.issued2017-05-18-
Data de envio: dc.date.issued2010-
Fonte completa do material: dc.identifierhttp://www.repositorio.ufop.br/handle/123456789/7763-
Fonte completa do material: dc.identifierhttp://onlinelibrary.wiley.com/doi/10.1002/jrs.2399/abstract-
Fonte completa do material: dc.identifierhttps://doi.org/10.1002/jrs.2399-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/capes/1024452-
Descrição: dc.descriptionThis work investigates the crystal structures and phonon modes of Ba(Ca1/2W1/2)O3, Ba(Ca1/2Mo1/2)O3 and Ba(Sr1/2W1/2)O3 perovskites by Raman spectroscopy. The samples were produced by conventional solid-state processing at 1200 ◦C. X-ray diffraction showed that single-phase homogeneous materials were produced, which are cubic or pseudo-cubic in symmetry. The existing controversies in the literature for these complex perovskiteswere investigated by comparing experimental Raman data with group-theory analysis. Ceramicswith Ca andWorMowere found to be cubic, space group Fm3m. For thesematerials, four Raman-active bands were observed and the fitting parameters showed that the Ba(Ca1/2Mo1/2)O3 ceramic presents bands at lower wavenumbers if compared with the Ba(Ca1/2W1/2)O3 sample. For the Ba(Sr1/2W1/2)O3 material, two hypotheses were investigated for monoclinic or triclinic structures. The experimental results showed 12 Raman-active modes for this ceramic, which is in perfect agreement with the theoretical predictions for a monoclinic (I2/m) structure.-
Formato: dc.formatapplication/pdf-
Idioma: dc.languageen-
Direitos: dc.rightsrestrito-
Palavras-chave: dc.subjectDouble perovskites-
Palavras-chave: dc.subjectRaman spectroscopy-
Palavras-chave: dc.subjectCeramics-
Palavras-chave: dc.subjectMicrowave dielectrics-
Título: dc.titleCrystal structures and phonon modes of Ba(Ca1/2W1/2)O3, Ba(Ca1/2Mo1/2)O3 and Ba(Sr1/2W1/2)O3 complex perovskites investigated by Raman scattering.-
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