A Raman and infrared spectroscopic analysis of the phosphate mineral wardite NaAl3(PO4)2(OH)4 .2(H2O) from Brazil.

Registro completo de metadados
MetadadosDescriçãoIdioma
Autor(es): dc.creatorFrost, Ray L.-
Autor(es): dc.creatorSholz, Ricardo Augusto-
Autor(es): dc.creatorLópez, Andrés-
Autor(es): dc.creatorLana, Cristiano de Carvalho-
Autor(es): dc.creatorXi, Yunfei-
Data de aceite: dc.date.accessioned2019-11-06T13:30:30Z-
Data de disponibilização: dc.date.available2019-11-06T13:30:30Z-
Data de envio: dc.date.issued2014-11-18-
Data de envio: dc.date.issued2014-11-18-
Data de envio: dc.date.issued2014-
Fonte completa do material: dc.identifierhttp://www.repositorio.ufop.br/handle/123456789/3956-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/capes/556802-
Descrição: dc.descriptionA wardite mineral sample from Lavra Da Ilha, Minas Gerais, Brazil has been examined by vibrational spectroscopy. The mineral is unusual in that it belongs to a unique symmetry class, namely the tetragonal-trapezohedral group. The structure of wardite contains layers of corner-linked –OH bridged MO6 octahedra stacked along the tetragonal C-axis in a four-layer sequence and linked by PO4 groups. Consequentially not all phosphate units are identical. Two intense Raman bands observed at 995 and 1051 cm^-1 are assigned to the m1 PO4^3- symmetric stretching mode. Intense Raman bands are observed at 605 and 618 cm^-1 with shoulders at 578 and 589 cm^-1 are assigned to the m4 out of plane bending modes of the PO4^3- . The observation of multiple bands supports the concept of non-equivalent phosphate units in the structure. Sharp infrared bands are observed at 3544 and 3611 cm^-1 are attributed to the OH stretching vibrations of the hydroxyl units. Vibrational spectroscopy enables subtle details of the molecular structure of wardite to be determined.-
Idioma: dc.languageen-
Direitos: dc.rightsO Periódico Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy concede permissão para depósito deste artigo no Repositório Institucional da UFOP. Número da licença: 3466021138825.-
Palavras-chave: dc.subjectWardite-
Palavras-chave: dc.subjectCyrilovite-
Palavras-chave: dc.subjectPhosphate-
Palavras-chave: dc.subjectHydroxyl-
Palavras-chave: dc.subjectRaman spectroscopy-
Título: dc.titleA Raman and infrared spectroscopic analysis of the phosphate mineral wardite NaAl3(PO4)2(OH)4 .2(H2O) from Brazil.-
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