Order–disorder–reorder process in thermally treated dolomite samples: a combined powder and single-crystal X-ray diffraction study

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  • Azzurra Zucchini
  • Paola Comodi
  • Anna Katerinopoulou
  • Balic Zunic, Tonci
  • Cathrin McCammon
  • F. Frondini
A combined powder and single-crystal X-ray diffraction analysis of dolomite [CaMg(CO3)2] heated to 1,200oC at 3 GPa was made to study the order–disorder–reorder process. The order/disorder transition is inferred to start below 1,100oC, and complete disorder is attained at approximately 1,200oC. Twinned crystals characterized by high internal order were found in samples annealed over 1,100oC, 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.
Original languageEnglish
JournalPhysics and Chemistry of Minerals
Issue number4
Pages (from-to)319–328
Number of pages10
Publication statusPublished - 2012

ID: 49378177