Please use this identifier to cite or link to this item: https://ir.swu.ac.th/jspui/handle/123456789/15298
ชื่อเรื่อง: Aragonite to calcite transformation studies by esr of Mn2+ ions in sinotaia ingallsiana
ผู้แต่ง: Udomkan N.
Limsuwan P.
วันที่เผยแพร่: 2009
บทคัดย่อ: 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 300°C, 400°C, 500°C, 600°C, 700°C, 800°C and 900°C, 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. © 2009 World Scientific Publishing Company.
URI: https://ir.swu.ac.th/jspui/handle/123456789/15298
https://www.scopus.com/inward/record.uri?eid=2-s2.0-65349174461&doi=10.1142%2fS0217984909019375&partnerID=40&md5=797e4d6155083a0eed87c8b24e9d1eb5
ISSN: 2179849
Appears in Collections:Scopus 1983-2021

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