School of Chemistry, Physics and Mechanical Engineering, Science and Engineering Faculty, Queensland University of Technology, GPO Box 2434, Brisbane, Queensland 4001, Australia.
School of Chemistry, Physics and Mechanical Engineering, Science and Engineering Faculty, Queensland University of Technology, GPO Box 2434, Brisbane, Queensland 4001, Australia.
Spectrochim Acta A Mol Biomol Spectrosc. 2014 Mar 25;122:252-6. doi: 10.1016/j.saa.2013.11.086. Epub 2013 Nov 21.
We have studied a mineral sample of mottramite PbCu(VO4)(OH) from Tsumeb, Namibia using a combination of scanning electron microscopy with EDX, Raman and infrared spectroscopy. Chemical analysis shows principally the elements V, Pb and Cu. Ca occurs as partial substitution of Pb as well as P and As in substitution to V. Minor amounts of Si and Cr were also observed. The Raman band of mottramite at 829 cm(-1), is assigned to the ν1 symmetric (VO4(-)) stretching mode. The complexity of the spectra is attributed to the chemical composition of the Tsumeb mottramite. The ν3 antisymmetric vibrational mode of mottramite is observed as very low intensity bands at 716 and 747 cm(-1). The series of Raman bands at 411, 439, 451 cm(-1) and probably also the band at 500 cm(-1) are assigned to the (VO4(-)) ν2 bending mode. The series of Raman bands at 293, 333 and 366 cm(-1) are attributed to the (VO4(-)) ν4 bending modes. The ν3, ν3 and ν4 regions are complex for both minerals and this is attributed to symmetry reduction of the vanadate unit from Td to Cs.
我们使用扫描电子显微镜结合 EDX、拉曼和红外光谱研究了来自纳米比亚 Tsumeb 的钼铅铜矿 PbCu(VO4)(OH) 的矿物样品。化学分析主要显示 V、Pb 和 Cu 元素。Ca 作为 Pb 的部分取代以及 P 和 As 对 V 的取代存在。还观察到少量的 Si 和 Cr。钼铅矿在 829 cm(-1)处的拉曼带被分配到 ν1 对称 (VO4(-)) 伸缩模式。光谱的复杂性归因于 Tsumeb 钼铅矿的化学成分。钼铅矿的 ν3 反对称振动模式以非常低的强度带出现在 716 和 747 cm(-1)处。一系列拉曼带在 411、439、451 cm(-1)处，可能还有 500 cm(-1)处的带被分配到 (VO4(-)) ν2 弯曲模式。一系列拉曼带在 293、333 和 366 cm(-1)处归因于 (VO4(-)) ν4 弯曲模式。对于两种矿物，ν3、ν3 和 ν4 区域都很复杂，这归因于钒酸盐单元从 Td 到 Cs 的对称性降低。
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