Rietveld refinement study of the cation distribution in (Co, Mg)-olivine solid solution |
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| Authors: | M Müller-Sommer R Hock A Kirfel |
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| Institution: | Mineralogisches Institut, Universit?t Würzburg, Am Hubland, D-97074 Würzburg, Germany, DE
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| Abstract: | The Co,?Mg-cation ordering in the Mg2SiO4–Co2SiO4 solid solution series as a function of the chemical composition has been studied by X-ray powder diffraction methods. The structures of nine polycrystalline samples prepared at 1200?°C and equally cooled to room temperature within 2 minutes have been refined by the Rietveld technique. The results corroborate earlier studies showing a strong preference of Co2+ for the M1 site. Considering the agreement of the powder diffraction results with those of single crystal studies allows the conclusion that the powder method is well suited for investigating the cation distribution in compounds exhibiting significant ordering effects. According to the cation distributions derived from first rapid quench experiments, the cation order of the slowly cooled samples corresponds to an estimated equilibrium temperature of 800?°C. |
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