Raman spectroscopic study of the tellurite mineral: sonoraite Fe3+Te4+O3(OH)·H2O

✍ Scribed by Ray L. Frost; Eloise C. Keeffe

• Publisher: John Wiley and Sons
• Year: 2009
• Tongue: English
• Weight: 117 KB
• Volume: 40
• Category: Article
• ISSN: 0377-0486
• DOI: 10.1002/jrs.2091

✦ Synopsis

Abstract

Tellurites may be subdivided according to formula and structure. Raman spectroscopy has been used to study sonoraite, an example of a tellurite with hydroxyl and water units in the mineral structure. The free tellurite ion will have C~3__v__~ symmetry and four modes, 2__A__~1~ and 2__E__. An intense Raman band at 779 cm^−1^ is assigned to the ν~1~ (TeO~3~)^2−^ symmetric stretching mode. A band at 666 cm^−1^ with a shoulder at 638 cm^−1^ is assigned to the ν~3~ (TeO~3~)^2−^ antisymmetric stretching mode. Bands at 374 and 387 cm^−1^ and the two bands at 425 and 468 cm^−1^ are assigned to the (TeO~3~)^2−^ν~2~(A~1~) and (TeO~3~)^2−^ν~4~(E) bending modes, respectively. The sharp band at 3423 cm^−1^ assigned to the OH stretching vibration of the OH unit is superimposed upon a broader spectral profile with Raman bands at 3000, 3223, 3350 and 3450 cm^−1^ which are attributed to water stretching bands. The technique of Raman spectroscopy is excellent for the study of tellurite minerals. Copyright © 2008 John Wiley & Sons, Ltd.