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FT-Raman study of three syntetic solid solutions formed by orthorhombic sulfates: Celestite-barytes, barytes-anglesite and celestite-anglesite

Alía Robledo, José María and Edwards, H.G.M. and López Andrés, Sol and González Martín, Paloma and García Navarro, F.J. and Mansour, H.R. (2000) FT-Raman study of three syntetic solid solutions formed by orthorhombic sulfates: Celestite-barytes, barytes-anglesite and celestite-anglesite. Spectroscopy letters, 33 (3). pp. 323-336. ISSN 0038-7010

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Abstract

In, the present work, three different solid solutions whose end-members are
the orthorhombic sulfates celestite (SrS04), barytes (BaS04) and anglesite (PbS04) are studied using FT-Raman spectroscopy. Sulfate anion symmetric
internal modes have been examined in detail by means of band-shape analysis and
component fitting procedures. The symmetric stretching mode v,(A,)changes its
wavenumber position lillearly with the cationic composition of the samples which
further confirrns the ideal character of the solid solutions studied. The corresponding full-width at half-height is strongly increased in the central
components of the different solid solutions which can be understood as an effect
of the positional disorder induced by random cationic substitution. Similar results
are observed in the syrnmetric bending mode, ~(E). The study of the low
frequency spectral region permits one to differentiate traslational modes of the
sulfate anion, which changes its wavenumberposition when the alkali-earth metal ion changes from rotational modes. This permits the tentative band assignement of
the anglesite rotational Raman bands at 134 and 152 cm-1, which were previously
not assigned.

Item Type:Article
Uncontrolled Keywords:FT-Raman, Solid solutions, Celestite, Barytes, Anglesite
Subjects:Sciences > Geology > Crystallography
ID Code:14804
Deposited On:13 Apr 2012 09:29
Last Modified:13 Apr 2012 09:29

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