School of Chemistry, Physics and Mechanical Engineering, Science and Engineering Faculty, Queensland University of Technology, Brisbane, Queensland 4001, Australia.
Spectrochim Acta A Mol Biomol Spectrosc. 2013 Oct;114:85-91. doi: 10.1016/j.saa.2013.04.111. Epub 2013 May 18.
The mineral amarantite Fe2(3+)(SO4)O·7H2O has been studied using a combination of techniques including thermogravimetry, electron probe analyses and vibrational spectroscopy. Thermal analysis shows decomposition steps at 77.63, 192.2, 550 and 641.4°C. The Raman spectrum of amarantite is dominated by an intense band at 1017 cm(-1) assigned to the SO4(2-) ν1 symmetric stretching mode. Raman bands at 1039, 1054, 1098, 1131, 1195 and 1233 cm(-1) are attributed to the SO4(2-) ν3 antisymmetric stretching modes. Very intense Raman band is observed at 409 cm(-1) with shoulder bands at 399, 451 and 491 cm(-1) are assigned to the ν2 bending modes. A series of low intensity Raman bands are found at 543, 602, 622 and 650 cm(-1) are assigned to the ν4 bending modes. A very sharp Raman band at 3529 cm(-1) is assigned to the stretching vibration of OH units. A series of Raman bands observed at 3025, 3089, 3227, 3340, 3401 and 3480 cm(-1) are assigned to water bands. Vibrational spectroscopy enables aspects of the molecular structure of the mineral amarantite to be ascertained.
利用热重分析、电子探针分析和振动光谱学等多种技术对 Fe2(3+)(SO4)O·7H2O 矿物进行了研究。热分析显示在 77.63°C、192.2°C、550°C 和 641.4°C 处存在分解步骤。amarantite 的 Raman 光谱主要由一个位于 1017cm(-1)处的强带主导，该带归因于 SO4(2-) ν1 对称伸缩模式。Raman 带位于 1039、1054、1098、1131、1195 和 1233cm(-1)归因于 SO4(2-) ν3 反对称伸缩模式。在 409cm(-1)处观察到非常强的 Raman 带，在 399、451 和 491cm(-1)处观察到肩带，归因于 ν2 弯曲模式。在 543、602、622 和 650cm(-1)处发现一系列低强度 Raman 带，归因于 ν4 弯曲模式。在 3529cm(-1)处观察到非常尖锐的 Raman 带，归因于 OH 单元的伸缩振动。在 3025、3089、3227、3340、3401 和 3480cm(-1)处观察到一系列 Raman 带，归因于水带。振动光谱学能够确定 amarantite 矿物的分子结构的某些方面。
