Raman spectroscopic study of the tellurite mineral: poughite Fe23+SO4(TeO3)2·3H2O—a multi‐anion mineral

Abstract

AbstractPoughite Fe23+SO4(TeO3)2·3H2O, a multi‐anion mineral containing both tellurite and sulfate units has been studied by Raman spectroscopy. Raman bands at 655 cm−1 is attributed to (TeO3)2− stretching bands. The intense sharp Raman band at 1026 cm−1 is assigned to the ν1(SO4)2− symmetric stretching mode, while the bands at 1078, 1152 and 1187 cm−1 are assigned to the ν3(SO4)2− antisymmetric stretching mode. The spectral region 100 to 600 cm−1 displays the bands, which are attributable to the (SO4)2− and (TeO3)2− bending modes. Some evidence from very low intensity Raman bands in the 2800–3600 cm−1 region provides evidence of proton‐tellurite anion interactions. Hydrogen bond distances have been calculated. Copyright © 2008 John Wiley & Sons, Ltd.