Order–disorder–reorder process in thermally treated dolomite samples: a combined powder and single-crystal X-ray diffraction study |
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| Authors: | Zucchini A Comodi P Katerinopoulou A Balic-Zunic T McCammon C Frondini F |
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| Institution: | (1) Dipartimento di Scienze della Terra, University of Perugia, Perugia, Italy;(2) Natural History Museum of Copenhagen, Copenhagen, Denmark;(3) Bayerisches Geoinstitut, University of Bayreuth, Bayreuth, Germany |
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| Abstract: | A combined powder and single-crystal X-ray diffraction analysis of dolomite CaMg(CO3)2] heated to 1,200°C at 3 GPa was made to study the order–disorder–reorder process. The order/disorder transition is inferred
to start below 1,100°C, and complete disorder is attained at approximately 1,200°C. Twinned crystals characterized by high
internal order were found in samples annealed over 1,100°C, and their fraction was found to increase with temperature. Evidences
of twinning domains combined with probable remaining disordered portions of the structure imply that reordering processes
occur during the quench. Twin domains are hereby proposed as a witness to thermally induced intra-layer-type cation disordering. |
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