Aragonite to calcite transformation studies by esr of Mn2+ ions in sinotaia ingallsiana
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Author list: Udomkan N., Limsuwan P.
Publisher: World Scientific Publishing
Publication year: 2009
Journal: Modern Physics Letters B (0217-9849)
Volume number: 23
Issue number: 9
Start page: 1243
End page: 1247
Number of pages: 5
ISSN: 0217-9849
eISSN: 1793-6640
Languages: English-Great Britain (EN-GB)
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Abstract
We have studied paramagnetic Mn2+ ions present in the freshwater snail, Sinotaia ingallsiana (FS), Viviparus which are abundant in Thailand. The FS shells in our study were ground into fine powder. A set of seven samples was each then separately annealed for 2 hours in air atmosphere at 300ฐC, 400ฐC, 500ฐC, 600ฐC, 700ฐC, 800ฐC and 900ฐC, respectively. Our detailed ESR spectral analyses of FS show that Mn2+ ions enter Ca2+ sites during a biomineralization process. The hyperfine coupling constant (A) and zero-field splitting (D) in the ESR spectrum of Mn2+ in calcite and aragonite were determined. The spreading of the non-central allowed transitions was analyzed and the experimental transitions were attributed. For calculating the hyperfine coupling constant, five methods for calculating the zero-field splitting, based on the analysis of the allowed and forbidden transitions, were provided. The values of the hyperfine coupling constant range from 87.50 to 89.00 G and those of the zero-field splitting range from 110.00 to 116.00 G. ฉ 2009 World Scientific Publishing Company.
Keywords
Hyperone coupling constant, splitting, Zero-eld
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