TY - JOUR
T1 - Order–disorder–reorder process in thermally treated dolomite samples
T2 - a combined powder and single-crystal X-ray diffraction study
AU - Zucchini, Azzurra
AU - Comodi, Paola
AU - Katerinopoulou, Anna
AU - Balic Zunic, Tonci
AU - McCammon, Cathrin
AU - Frondini, F.
PY - 2012/4
Y1 - 2012/4
N2 - A combined powder and single-crystal X-ray diffraction analysis of dolomite [CaMg(CO 3) 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.
AB - A combined powder and single-crystal X-ray diffraction analysis of dolomite [CaMg(CO 3) 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.
U2 - 10.1007/s00269-012-0489-9
DO - 10.1007/s00269-012-0489-9
M3 - Journal article
SN - 0342-1791
VL - 39
SP - 319
EP - 328
JO - Physics and Chemistry of Minerals
JF - Physics and Chemistry of Minerals
IS - 4
ER -