A vibrational spectroscopic study of the silicate mineral ardennite-(As).

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MetadadosDescriçãoIdioma
Autor(es): dc.creatorFrost, Ray L.-
Autor(es): dc.creatorLópez, Andrés-
Autor(es): dc.creatorXi, Yunfei-
Autor(es): dc.creatorScholz, Ricardo Augusto-
Autor(es): dc.creatorGandini, Antônio Luciano-
Data de aceite: dc.date.accessioned2019-11-06T13:32:26Z-
Data de disponibilização: dc.date.available2019-11-06T13:32:26Z-
Data de envio: dc.date.issued2015-02-26-
Data de envio: dc.date.issued2015-02-26-
Data de envio: dc.date.issued2014-
Fonte completa do material: dc.identifierhttp://www.repositorio.ufop.br/handle/123456789/4507-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/capes/557596-
Descrição: dc.descriptionWe have used a combination of scanning electron microscopy with EDX and vibrational spectroscopy to study the mineral ardennite-(As). The mineral ardennite-(As) of accepted formula Mn4(2+)(Al,Mg)6(Si3O10)(SiO4)2(AsO4,VO4)(OH)6 is a silicate mineral which may contain arsenate and/or vanadates anions. Because of the oxyanions present, the mineral lends itself to analysis by Raman and infrared spectroscopy. Qualitative chemical analysis shows a homogeneous phase, composed by Si, Mn, Al and As. Ca and V were also observed in partial substitution for Mn and As. Raman bands at 1197, 1225, 1287 and 1394 cm(-1) are assigned to SiO stretching vibrations. The strong Raman bands at 779 and 877 cm(-1) are assigned to the AsO4(3-) antisymmetric and symmetric stretching vibrations. The Raman band at 352 cm(-1) is assigned to the ν2 symmetric bending vibration. The series of Raman bands between 414 and 471 cm(-1)are assigned to the ν4 out of plane bending modes of the AsO4(3-) units. Intense Raman bands observed at 301 and 314 cm(-1) are attributed to the MnO stretching and bending vibrations. Raman bands at 3041, 3149, 3211 and 3298 cm(-1) are attributed to the stretching vibrations of OH units. There is vibrational spectroscopic evidence for the presence of water adsorbed on the ardennite-(As) surfaces.-
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: 3490330489368.-
Palavras-chave: dc.subjectSilicate-
Palavras-chave: dc.subjectRaman spectroscopy-
Palavras-chave: dc.subjectArdennite-
Palavras-chave: dc.subjectInfrared spectroscopy-
Palavras-chave: dc.subjectAdsorbed water-
Título: dc.titleA vibrational spectroscopic study of the silicate mineral ardennite-(As).-
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