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

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 3v symmetry and four modes, 2A 1 and 2E. 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.

Determination of the Correct Composition of “Hydrous Lead(II) Oxotellurate(IV)” as PbTeO3, Crystallizing as a New Polymorph

“…Analogous values for the two other modifications are β-PbTeO3: 755 and 702 cm −1 (νs), 639 cm −1 (νas), 375, 322, 284 cm −1 (δ); γ-PbTeO3: 738 and 718 cm −1 (νs), 679, 640, 606 cm −1 (νas), 403, 372, 345, 316 cm −1 (δ). These wave numbers are in agreement with those observed in the Raman spectra of other compounds comprising the TeO3 2− anion; e.g., the synthetic thallium(I) compound Tl2TeO3 [36] or the mineral sonoraite Fe III Te IV O3(OH)·H2O [37]. Raman bands in the region between 120 and 300 cm −1 observed for the three PbTeO3 polymorphs can be associated with Pb-O modes, and at lower wave numbers with lattice vibrations.…”

Raman spectroscopic study of the uranyl titanate mineral betafite (Ca,U)2(Ti,Nb)2O6(OH): effect of metamictization

“…Raman spectroscopy has proven very useful for the study of minerals (7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20). Indeed, Raman spectroscopy has proven most useful for the study of diagenetically related minerals as often occurs with minerals containing uranyl groups (7-9, 14, 21).…”

Raman spectroscopic study of the hydrogen‐arsenate mineral pharmacolite Ca(AsO3OH)·2H2O—implications for aquifer and sediment remediation

“…The aim of this paper is to report the Raman and infrared spectra of pharmacolite and to relate the spectra to the molecular chemistry and the crystal chemistry of this arsenate mineral. The paper follows the systematic research of the large group of supergene minerals16–18 and especially molecular structure of minerals containing oxyanions using IR and Raman spectroscopies 19–32…”