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Title: The phosphate mineral arrojadite-(KFe) and its spectroscopic characterization.
Authors: Frost, Ray Leslie
Xi, Yunfei
Cipriano, Ricardo Augusto Scholz
Horta, Laura Frota Campos
Keywords: Arrojadite
Raman spectroscopy
Infrared spectroscopy
Issue Date: 2013
Citation: FROST, R. L. et al. The phosphate mineral arrojadite-(KFe) and its spectroscopic characterization. Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy, v. 109, p. 138-145, 2013. Disponível em: <>. Acesso em: 07 out. 2014.
Abstract: The arrojadite- (KFe)mineral has been analyzed using acombination of scanning electron microscopy and a combination of Raman and infrared spectroscopy. The origin of the mineral is Rapid Creek sedimentary phosphatic iron formation ,northern Yukon. The formula of the mineral was determined as K2:06Na2Ca0:89Na3:23ðFe7:82Mg4:40Mn0:78ÞR13:00Al1:44ðPO4Þ10:85ðPO3OH0:23ÞðOHÞ2. The complexity of the mineral formula is reflectedin the spectroscopy. Raman bands at 975, 991 and 1005 cm _1 with shoulder bands at 951 and 1024 cm _1 are assigned to the PO 3_ 4 m1 symmetric stretching modes. The Raman bands at 1024, 1066, 1092, 1123, 1148 and 1187 cm _1 are assigned to the PO 3_ 4 m3 antisymmetric stretching modes. Aseries of Raman bands observed at 540, 548, 557, 583, 604, 615 and 638 cm _1 are attributed to the m4 out of plane bending modes of the PO 4 and H2PO4 units. The m2 PO4 and H2PO4 ben ding modes are observed at 403, 424, 449, 463, 479 and 513 cm _1. Hydroxyl and water stretching bands are readily observed. Vibrational spectroscopy enables new information about the com- plex phos phate mineral arrojadite-(KFe)to be obtained.
ISSN: 1386-1425
metadata.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  3487300506636.
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