Raman spectroscopic study of the mixed anion mineral Yecoraite Bi5Fe3O9(Te4+O3)(Te6+O4)2•9H2O


Autoria(s): Frost, Ray L.; Keeffe, Eloise C.
Data(s)

18/09/2009

Resumo

Tellurates are rare minerals as the tellurate anion is readily reduced to the tellurite ion. Often minerals with both tellurate and tellurite anions in the mineral are found. An example of such a mineral containing tellurate and tellurite is yecoraite. Raman spectroscopy has been used to study this mineral, the exact structure of which is unknown. Two Raman bands at 796 and 808 cm-1 are assigned to the ν1 (TeO4)2- symmetric and ν3 (TeO3)2- antisymmetric stretching modes and Raman bands at 699 cm-1 are attributed to the the ν3 (TeO4)2- antisymmetric stretching mode and the band at 690 cm-1 to the ν1 (TeO3)2- symmetric stretching mode. The intense band at 465 cm-1 with a shoulder at 470 cm-1 is assigned the (TeO4)2- and (TeO3)2- bending modes. Prominent Raman bands are observed at 2878, 2936, 3180 and 3400 cm-1. The band at 3936 cm-1 appears quite distinct and the observation of multiple bands indicates the water molecules in the yecoraite structure are not equivalent. The values for the OH stretching vibrations listed provide hydrogen bond distances of 2.625 Å (2878 cm-1), 2.636 Å (2936 cm-1), 2.697 Å (3180 cm-1) and 2.798 Å (3400 cm-1). This range of hydrogen bonding contributes to the stability of the mineral. A comparison of the Raman spectra of yecoraite with that of tellurate containing minerals kuranakhite, tlapallite and xocomecatlite is made.

Formato

application/pdf

Identificador

http://eprints.qut.edu.au/27422/

Publicador

John Wiley & Sons

Relação

http://eprints.qut.edu.au/27422/2/27422.pdf

DOI:10.1002/jrs.2195

Frost, Ray L. & Keeffe, Eloise C. (2009) Raman spectroscopic study of the mixed anion mineral Yecoraite Bi5Fe3O9(Te4+O3)(Te6+O4)2•9H2O. Journal of Raman Spectroscopy, 40(9), pp. 1117-1120.

Direitos

Copyright 2009 John Wiley & Sons

Fonte

Faculty of Science and Technology; School of Physical & Chemical Sciences

Palavras-Chave #030600 PHYSICAL CHEMISTRY (INCL. STRUCTURAL) #030606 Structural Chemistry and Spectroscopy #030601 Catalysis and Mechanisms of Reactions #tellurate #tellurite #yecoraite #xocomecatlite #Raman spectroscopy
Tipo

Journal Article