A Raman and infrared spectroscopic analysis of the phosphate mineral wardite NaAl3(PO4)2(OH)4 .2(H2O) from Brazil.
| dc.contributor.author | Frost, Ray Leslie | |
| dc.contributor.author | Cipriano, Ricardo Augusto Scholz | |
| dc.contributor.author | López, Andrés | |
| dc.contributor.author | Lana, Cristiano de Carvalho | |
| dc.contributor.author | Xi, Yunfei | |
| dc.date.accessioned | 2014-11-18T16:40:03Z | |
| dc.date.available | 2014-11-18T16:40:03Z | |
| dc.date.issued | 2014 | |
| dc.description.abstract | A 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. | pt_BR |
| dc.identifier.citation | FROST, RAY L. et al. A Raman and infrared spectroscopic analysis of the phosphate mineral wardite NaAl3(PO4)2(OH)4 .2(H2O) from Brazi. Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy, v. 11, p. 1, 2014. Disponível em: <http://www.sciencedirect.com/science/article/pii/S1386142514001942>. Acesso em: 04 set. 2014. | pt_BR |
| dc.identifier.doi | https://doi.org/10.1016/j.saa.2014.02.007 | |
| dc.identifier.issn | 1386-1425 | |
| dc.identifier.uri | http://www.repositorio.ufop.br/handle/123456789/3956 | |
| dc.language.iso | en_US | pt_BR |
| dc.rights.license | O periódico Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy concede permissão para depósito deste artigo no Repositório Institucional da UFOP. Número da licença: 3466021138825. | pt_BR |
| dc.subject | Wardite | pt_BR |
| dc.subject | Cyrilovite | pt_BR |
| dc.subject | Phosphate | pt_BR |
| dc.subject | Hydroxyl | pt_BR |
| dc.subject | Raman spectroscopy | pt_BR |
| dc.title | A Raman and infrared spectroscopic analysis of the phosphate mineral wardite NaAl3(PO4)2(OH)4 .2(H2O) from Brazil. | pt_BR |
| dc.type | Artigo publicado em periodico | pt_BR |