title: A Raman spectroscopic study of the mineral coquandite Sb6O8(SO4)x(H2O).
abstract: Raman spectra of coquandite Sb(6)O(8)(SO(4))x(H(2)O) were studied, and related to the structure of the mineral. Raman bands observed at 970, 990 and 1007 cm(-1) and a series of overlapping bands are observed at 1072, 1100, 1151 and 1217 cm(-1) are assigned to the SO(4)(2-) nu(1) symmetric and nu(3) antisymmetric stretching modes respectively. Raman bands at 629, 638, 690, 751 and 787 cm(-1) are attributed to the SbO stretching vibrations. Raman bands at 600 and 610 cm(-1) and at 429 and 459 cm(-1) are assigned to the SO(4)(2-) nu(4) and nu(2) bending modes. Raman bands at 359 and 375 cm(-1) are assigned to O-Sb-O bending modes. Multiple Raman bands for both SO(4)(2-) and SbO stretching vibrations support the concept of the non-equivalence of these units in the coquandite structure.
authors.affiliation: Inorganic Materials Research Program, School of Physical and Chemical Sciences, Queensland University of Technology, GPO Box 2434, 2 George St, Brisbane, Queensland 4001, Australia. r.frost@qut.edu.au
authors.forename: Ray L
authors.initials: RL
authors.lastname: Frost
authors.forename: Silmarilly
authors.initials: S
authors.lastname: Bahfenne
mesh_terms: D006801:Humans; D008903:Minerals / Q000737:chemistry*; D013059:Spectrum Analysis, Raman; D013431:Sulfates / Q000737:chemistry*; D017971:Tin Compounds; D014867:Water / Q000737:chemistry*
chemical_list: D008903:Minerals; D013431:Sulfates; D017971:Tin Compounds; D014867:Water