Raman spectroscopic study of the schmiederite Pb2Cu2[(OH)4|SeO3|SeO4]
Raman spectroscopy lends itself to the studies of selenites, selenates, tellurites and tellurates and related minerals. The mineral schmiederite Pb2Cu2[(OH)4|SeO3|SeO4] is interesting in that both selenite and selenate anions occur in the structure.
Raman bands of schmiederite at 1095 and 934 cm-1 are assigned to the symmetric and antisymmetric mode of the (SeO4)2- anions. For selenates and selenites, the symmetric stretching mode occurs at a higher position than the antisymmetric stretching mode, as is evidenced in the Raman spectrum of schmiederite. The band at 834 cm-1 is assigned to the symmetric (SeO3)2- units. The two bands at 764 and 739 cm-1 are attributed to the antisymmetric (SeO3)2- units. An intense sharp band at 398 cm-1 is assigned to this ν2 bending mode.
The two bands at 1576 and 1604 cm-1 are assigned to the deformation modes of the OH units. The observation of multiple OH bands supports the concept of a much distorted structure. This is based upon the four OH units coordinating the copper in a square planar structure. A single symmetric Raman band is observed at 3428 cm-1 and is assigned to the symmetric stretching mode of the OH units. The observation of multiple infrared OH stretching bands supports the concept of non-equivalent OH units in the schmiederite structure.
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|Item Type:||Journal Article|
|Keywords:||selenate, selenite, Raman spectroscopy, mandarinoite, schmiederite, chalcomenite, clinochalcomenite|
|Subjects:||Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600)|
Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Structural Chemistry and Spectroscopy (030606)
Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Colloid and Surface Chemistry (030603)
|Divisions:||Past > QUT Faculties & Divisions > Faculty of Science and Technology|
Past > Schools > School of Physical & Chemical Sciences
|Copyright Owner:||Copyright 2008 John Wiley & Sons|
|Copyright Statement:||The definitive version is available on publication at www3.interscience.wiley.com|
|Deposited On:||23 Sep 2008|
|Last Modified:||29 Feb 2012 23:49|
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