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Updated: Jun 17, 2026

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
Published on: June 7, 2018
A Raman spectroscopic study of the mineral coquandite Sb6O8(SO4)x(H2O)
Ray L Frost1, Silmarilly Bahfenne
1Inorganic 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
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.
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