Inorganic Materials Research Program, School of Physical and Chemical Sciences, Queensland University of Technology, GPO Box 2434, Brisbane, Queensland 4001, Australia.
Spectrochim Acta A Mol Biomol Spectrosc. 2010 Feb;75(2):710-2. doi: 10.1016/j.saa.2009.11.043. Epub 2009 Nov 24.
Raman spectroscopy has been used to characterise the antimonate mineral langbanite (Mn, Ca, Fe)(4)(2+)(Mn(3+), Fe(3+))(9)Sb(5+)Si(2)O(24). The mineral is characterised by a series of peaks in the 850-1200 cm(-1) region. Raman bands observed at 872 and 897cm(-1) are assigned to SbO antisymmetric and symmetric stretching vibrations, respectively. Associated with the SbO units are the bands at 330, 351 and 386 cm(-1) attributed to OSbO bending modes. Four Raman bands observed at 964, 986, 1012 and 1034 cm(-1) are assigned to SiO stretching vibrations. The observation of multiple SiO Raman bands provides evidence for the non-equivalence of the SiO units in the langbanite structure. Associated with the SiO units are the Raman bands at 542, 558, 646 and 671 cm(-1) attributed to OSiO bending modes. Low intensity bands are observed at 1130, 1200, 1432, 1718 and 1947 cm(-1) and are probably associated with delta SbOH deformation modes. Raman bands are observed at 3076 and 3476 cm(-1) and are assigned to strongly bonded water molecules involved in the langbanite structure. A sharp Raman band at 3680 cm(-1) are assigned to OH stretching vibrations. Raman spectroscopy provides evidence for water and OH units in the structure of langbanite and brings the formula of the mineral into question.
拉曼光谱已被用于表征辉锑矿 Langbanite（Mn，Ca，Fe）（4）（2+）（Mn（3+），Fe（3+））（9）Sb（5+）Si（2）O（24）。该矿物的特征在于在 850-1200 cm（-1）区域存在一系列峰。观察到的 872 和 897cm（-1）处的拉曼带分别分配给 SbO 反对称和对称伸缩振动。与 SbO 单元相关的是 330、351 和 386 cm（-1）处归因于 OSbO 弯曲模式的带。在 964、986、1012 和 1034 cm（-1）处观察到的四个拉曼带分配给 SiO 伸缩振动。多个 SiO 拉曼带的观察为 Langbanite 结构中 SiO 单元的不等价提供了证据。与 SiO 单元相关的是归因于 OSiO 弯曲模式的 542、558、646 和 671 cm（-1）处的拉曼带。在 1130、1200、1432、1718 和 1947 cm（-1）处观察到低强度带，可能与 delta SbOH 变形模式有关。在 3076 和 3476 cm（-1）处观察到拉曼带，并分配给强烈结合水分子，参与 Langbanite 结构。在 3680 cm（-1）处观察到尖锐的拉曼带分配给 OH 伸缩振动。拉曼光谱为 Langbanite 结构中的水和 OH 单元提供了证据，并对矿物的公式提出了质疑。
