STRUCTURAL RELAXATION IN THE MNCO3-CACO3 SOLID SOLUTION: A MN K-EDGE EXAFS STUDY
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dc.contributor.author | Lee Y.J. | |
dc.contributor.author | Reeder R.J. | |
dc.contributor.author | Wenskus R.W. | |
dc.contributor.author | Elzinga E.J. | |
dc.date.accessioned | 2021-06-03T06:25:20Z | |
dc.date.available | 2021-06-03T06:25:20Z | |
dc.date.issued | 2002 | |
dc.identifier | https://elibrary.ru/item.asp?id=1373915 | |
dc.identifier.citation | Physics and Chemistry of Minerals, 2002, 29, 9, 585-594 | |
dc.identifier.issn | 0342-1791 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/28811 | |
dc.description.abstract | Mn K-edge EXAFS spectroscopy of solid-solution samples encompassing the complete MnCO3-CaCO3 series shows that first-shell Mn-O distances deviate little from the 2.19-A distance observed in pure MnCO3. Very slight lengthening is observed only in the limiting case of dilute Mn(II) calcite solid solutions, where the Mn-O distance is 2.21 A. The observed nearly complete structural relaxation and the composition independence of the Mn-O distance are consistent with the Pauling model behavior of solid solutions, and agree with previous studies showing a high degree of relaxation around hetero-sized substituents in the calcite structure. Strain occurs through bond bending, which is facilitated by the exclusively corner-sharing topology of calcite. Observed distances from Mn to more distant neighbors show significant variation across the solid-solution series that resembles Vegard's law-type behavior but reflects averaging. The high degree of relaxation suggests modest enthalpies of mixing in the solution, consistent with calorimetric studies. | |
dc.subject | CALCITE | |
dc.subject | RHODOCHROSITE | |
dc.subject | EXAFS | |
dc.subject | SOLID SOLUTIONS | |
dc.subject | RELAXATION | |
dc.subject | IMPURITIES | |
dc.title | STRUCTURAL RELAXATION IN THE MNCO3-CACO3 SOLID SOLUTION: A MN K-EDGE EXAFS STUDY | |
dc.type | Статья |
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