title: Vibrational spectroscopic study of the antimonate mineral bindheimite Pb2Sb2O6(O,OH).
abstract: Raman spectroscopy complimented with infrared spectroscopy has been used to characterise the antimonate mineral bindheimite Pb(2)Sb(2)O(6)(O,OH). The mineral is characterised by an intense Raman band at 656 cm(-1) assigned to SbO stretching vibrations. Other lower intensity bands at 664, 749 and 814 cm(-1) are also assigned to stretching vibrations. This observation suggests the non-equivalence of SbO units in the structure. Low intensity Raman bands at 293, 312 and 328c m(-1) are assigned to the OSbO bending vibrations. Infrared bands at 979, 1008, 1037 and 1058 cm(-1) may be assigned to deltaOH deformation modes of SbOH units. Infrared bands at 1603 and 1640 cm(-1) are assigned to water bending vibrations, suggesting that water is involved in the bindheimite structure. Broad infrared bands centred upon 3250 cm(-1) supports this concept. Thus the true formula of bindheimite is questioned and probably should be written as Pb(2)Sb(2)O(6)(O,OH,H(2)O).
authors.affiliation: Inorganic Materials Research Program, School of Physical and Chemical Sciences, Queensland University of Technology, Brisbane, Queensland 4001, Australia.
authors.forename: Silmarilly
authors.initials: S
authors.lastname: Bahfenne
authors.forename: Ray L
authors.initials: RL
authors.lastname: Frost
mesh_terms: D000965:Antimony / Q000737:chemistry*; D007854:Lead / Q000737:chemistry; D008903:Minerals / Q000737:chemistry*; D008969:Molecular Sequence Data; D013055:Spectrophotometry, Infrared; D013059:Spectrum Analysis, Raman; D014732:Vibration
chemical_list: D008903:Minerals; C545072:bindheimite; D007854:Lead; D000965:Antimony