Frost Ray L
Queensland University of Technology, Brisbane, Australia.
Spectrochim Acta A Mol Biomol Spectrosc. 2009 May;72(4):903-6. doi: 10.1016/j.saa.2008.12.008. Epub 2008 Dec 24.
Tellurates may be subdivided according to formula and structure. There are three types of tellurate minerals: type (a) (AB)(m)(TeO(4))(p)Z(q), type (b) (AB)(m)(TeO(6)).xH(2)O and type (c), compound tellurates in which a second anion is involved. Tlapallite, a multi-anion mineral containing both tellurate and tellurite units, as well as sulphate, is an example of type (a). Tellurates are rare minerals as the tellurate ion is easily reduced to the tellurite ion. Raman bands at 691, 708, 764 and 796cm(-1) are attributed to (TeO(6))(2-) and (TeO(3))(2-) stretching bands. The intense sharp Raman band at 973cm(-1) is assigned to the nu(1) (SO(4))(2-) symmetric stretching mode, whilst the two bands at 1062 and 1104cm(-1) are assigned to the nu(3) (SO(4))(2-) antisymmetric stretching mode. The spectral region 100 to 600cm(-1) displays the bands which are attributable to the (SO(4))(2), (TeO(3))(2-) and (TeO(6))(4-) bending modes. Some evidence from very low intensity Raman bands in the 2800-3600cm(-1) region provides evidence of proton-tellurate/tellurite anion interactions.
碲酸盐可根据化学式和结构进行细分。碲酸盐矿物有三种类型：类型（a）（AB）（m）（TeO₄）（p）Z（q）、类型（b）（AB）（m）（TeO₆）·xH₂O以及类型（c），即涉及第二种阴离子的复合碲酸盐。含碲酸盐和亚碲酸盐单元以及硫酸盐的多阴离子矿物氯汞银矿是类型（a）的一个例子。碲酸盐是稀有矿物，因为碲酸根离子很容易还原为亚碲酸根离子。691、708、764和796cm⁻¹处的拉曼谱带归因于（TeO₆）²⁻和（TeO₃）²⁻的伸缩谱带。973cm⁻¹处强烈尖锐的拉曼谱带归属于ν₁（SO₄）²⁻对称伸缩模式，而1062和1104cm⁻¹处的两个谱带归属于ν₃（SO₄）²⁻反对称伸缩模式。100至600cm⁻¹的光谱区域显示出可归因于（SO₄）²⁻、（TeO₃）²⁻和（TeO₆）⁴⁻弯曲模式的谱带。2800 - 3600cm⁻¹区域非常低强度的拉曼谱带提供了一些证据，证明了质子 - 碲酸盐/亚碲酸盐阴离子相互作用。
