碲酸盐矿物（水碲铜矿和水碲铅矿）的拉曼光谱研究
Raman spectroscopic study of the tellurite minerals: rajite and denningite.
作者信息
Frost Ray L, Dickfos Marilla J, Keeffe Eloise C
机构信息
Inorganic Materials Research Program, School of Physical and Chemical Sciences, Queensland University of Technology, GPO Box 2434, Brisbane, Queensland 4001, Australia.
出版信息
Spectrochim Acta A Mol Biomol Spectrosc. 2008 Dec 15;71(4):1512-5. doi: 10.1016/j.saa.2008.05.012. Epub 2008 May 18.
Tellurites may be subdivided according to formula and structure. There are five groups based upon the formulae (a) A(XO3), (b) A(XO3).xH2O, (c) A2(XO3)3.xH2O, (d) A2(X2O5) and (e) A(X3O8). Raman spectroscopy has been used to study rajite and denningite, examples of group (d). Minerals of the tellurite group are porous zeolite-like materials. Raman bands for rajite observed at 740, and 676 and 667 cm(-1) are attributed to the nu1 (Te2O5)(2-) symmetric stretching mode and the nu3 (TeO3)(2-) antisymmetric stretching modes, respectively. A second rajite mineral sample provided a more complex Raman spectrum with Raman bands at 754 and 731 cm(-1) assigned to the nu1 (Te2O5)(2-) symmetric stretching modes and two bands at 652 and 603 cm(-1) are accounted for by the nu3 (Te2O5)(2-) antisymmetric stretching mode. The Raman spectrum of dennigite displays an intense band at 734 cm(-1) attributed to the nu1 (Te2O5)(2-) symmetric stretching mode with a second Raman band at 674 cm(-1) assigned to the nu3 (Te2O5)(2-) antisymmetric stretching mode. Raman bands for rajite, observed at (346, 370) and 438 cm(-1) are assigned to the (Te2O5)(2-)nu2 (A1) bending mode and nu4 (E) bending modes.
亚碲酸盐可根据化学式和结构进行细分。根据化学式可分为五类：(a) A(XO3)，(b) A(XO3)·xH2O，(c) A2(XO3)3·xH2O，(d) A2(X2O5) 和 (e) A(X3O8)。拉曼光谱已被用于研究(d)类的拉吉特矿和丹宁矿。亚碲酸盐类矿物是类似沸石的多孔材料。在740、676和667 cm⁻¹处观察到的拉吉特矿的拉曼谱带分别归因于ν1 (Te2O5)²⁻对称伸缩模式和ν3 (TeO3)²⁻反对称伸缩模式。另一个拉吉特矿样品提供了更复杂的拉曼光谱，在754和731 cm⁻¹处的拉曼谱带被指定为ν1 (Te2O5)²⁻对称伸缩模式，在652和603 cm⁻¹处的两个谱带由ν3 (Te2O5)²⁻反对称伸缩模式解释。丹宁矿的拉曼光谱在734 cm⁻¹处显示出一个强峰，归因于ν1 (Te2O5)²⁻对称伸缩模式，在674 cm⁻¹处有第二个拉曼谱带，被指定为ν3 (Te2O5)²⁻反对称伸缩模式。在(346, 370)和438 cm⁻¹处观察到的拉吉特矿的拉曼谱带被指定为(Te2O5)²⁻ν2 (A₁)弯曲模式和ν4 (E)弯曲模式。
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