A Raman spectroscopic study of the arsenate mineral chenevixite Cu2Fe23+(AsO4)(2)(OH)(4)center dot H2O

作者：Frost Ray L^*; Lopez Andres; Scholz Ricardo; Lana Cristiano; Xi Yunfei

来源：Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy , 2015, 135: 192-197.

DOI：10.1016/j.saa.2014.06.091

• Chenevixite
• Luetheite
• Arsenate
• Raman spectroscopy
• Infrared spectroscopy

We have studied the mineral chenevixite from Manto Cuba Mine, San Pedro de Cachiyuyo District, Inca de Oro, Cha (n) over tilde aral Province, Atacama Region, Chile, using a combination of scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDX) and vibrational spectroscopy. Qualitative chemical analysis shows a homogeneous composition, with predominance of As, Fe, Al, Cu, Fe and Cu. Minor amounts of Si were also observed. Raman spectroscopy complimented with infrared spectroscopy has been used to assess the molecular structure of the arsenate minerals chenevixite. Characteristic Raman and infrared bands of the (AsO4)(3-) stretching and bending vibrations are identified and described. The observation of multiple bands in the (AsO4)(3-) bending region offers support for the loss of symmetry of the arsenate anion in the structure of chenevixite. Raman bands attributable to the OH stretching vibrations of water and hydroxyl units were analysed. Estimates of the hydrogen bond distances were made based upon the OH stretching wavenumbers.

• 出版日期2015-1-25