Synthesis and spectroscopic characterization of apjohnite and pickingerite

Frost, Ray L. & Palmer, Sara J. (2006) Synthesis and spectroscopic characterization of apjohnite and pickingerite. Polyhedron, 25(17), pp. 3379-3386.

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Raman spectroscopy complimented with infrared ATR spectroscopy has been used to characterise two synthetic halotrichites: apjohnite MnSO4.Al2(SO4)3.22H2O and pickingerite MgSO4.Al2(SO4)3.22H2O. A comparison is made with the spectra of natural pseudo-alums halotrichite, pickingerite and apjohnite. Two Raman bands observed at 995 and 990 cm-1 for apjohnite and a single band at 984 cm-1 for pickingerite are assigned to the ○1(Ag) SO4 symmetric stretching vibrations. Raman bands observed at 1141 and 1080 cm-1 for apjohnite and 1096 and 1058 cm-1 for pickingerite are assigned to the antisymmetric stretching vibration ○3(Bg) SO4. Raman bands at 474, 460 and 423 cm-1 for apjohnite and at 459 and 445 cm-1 for pickingerite are attributed to the ○2(Ag) SO4 mode. The band at 618 cm-1 is assigned to the ○4(Bg) SO4 mode. The splitting of the ○2, ○3 and ○4 modes is attributed to the reduction of symmetry of the SO4 and it is proposed that the sulphate coordinates to water in the hydrated aluminium in bidentate chelation.

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ID Code: 5496
Item Type: Journal Article
Refereed: Yes
Additional Information: This paper is one of a series of manuscripts on sulphate secondary minerals formed from aqueous solutions such as with acid mine drainage.
Keywords: apjohnite, pickingerite, sulphate, halotrichite, jarosite, infrared and Raman spectroscopy
DOI: 10.1016/j.poly.2006.06.010
ISSN: 0277-5387
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > INORGANIC CHEMISTRY (030200)
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Copyright Owner: Copyright 2006 Elsevier
Copyright Statement: Reproduced in accordance with the copyright policy of the publisher.
Deposited On: 20 Nov 2006 00:00
Last Modified: 05 May 2014 23:44

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