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Vibrational spectra of BaMn(CO (sub 3) ) (sub 2) and a re-analysis of the Raman spectrum of BaMg(CO (sub 3) ) (sub 2)

Burkhard C. Schmidt, Peer-Lennart Gehlken and Michael E. Boettcher
Vibrational spectra of BaMn(CO (sub 3) ) (sub 2) and a re-analysis of the Raman spectrum of BaMg(CO (sub 3) ) (sub 2)
European Journal of Mineralogy (February 2013) 25 (2): 137-144

Abstract

Raman and mid-infrared (MIR) spectra have been measured on BaMn(CO (sub 3) ) (sub 2) , an ordered double carbonate, synthesised at low and at high pressures and temperatures (1 atm, 21 degrees C and 15 kbar, 510 + or - 10 degrees C, respectively). The results show no significant influence of synthesis conditions on the vibrational spectra of the double carbonate within analytical uncertainty. This indicates no enhancement in positional disorder of the carbonate group in the low-temperature phase compared to the high-temperature phase. In addition, a re-analysis of the Raman spectrum of synthetic BaMg(CO (sub 3) ) (sub 2) (norsethite) was carried out. Both double carbonates are structurally very similar and show close relationships in their spectra. One prominent difference is the occurrence of a sharp single nu 2 Raman mode in the spectrum of BaMg(CO (sub 3) ) (sub 2) , indicating some structural differences. A comparison of results obtained for the synthetic carbonates with literature data for solid-solutions between the two double carbonates (so-called "Mn-bearing norsethites") suggests that the absorption band maxima of the mid-IR nu 1 and nu 3 vibrations follow linear trends as a function of the Mn index (X (sub Mn) = Mn (super 2+) /(Mn (super 2+) +Mg (super 2+) )) between the two end-member double carbonates, which may be explained by the different radii and masses of divalent magnesium and manganese.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 25
Serial Issue: 2
Title: Vibrational spectra of BaMn(CO (sub 3) ) (sub 2) and a re-analysis of the Raman spectrum of BaMg(CO (sub 3) ) (sub 2)
Affiliation: Georg-August University Goettingen, Experimental and Applied Mineralogy, Gottingen, Germany
Pages: 137-144
Published: 201302
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Germany
References: 24
Accession Number: 2013-046193
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 4 tables
Secondary Affiliation: Leibniz Institute for Baltic Sea Research, DEU, Germany
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Schweizerbart'sche Verlagsbuchhandlung. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201329
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