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

被引：24
|
作者：
Zucchini, A. [1 ]
Comodi, P. [1 ]
Katerinopoulou, A. [2 ]
Balic-Zunic, T. [2 ]
McCammon, C. [3 ]
Frondini, F. [1 ]
机构：
[1] Univ Perugia, Dipartimento Sci Terra, I-06100 Perugia, Italy
[2] Nat Hist Museum Copenhagen, Copenhagen, Denmark
[3] Univ Bayreuth, Bayer Geoinst, Bayreuth, Germany
来源：
PHYSICS AND CHEMISTRY OF MINERALS | 2012年 / 39卷 / 04期
关键词：
Dolomite; Cation disorder; Twinning; High pressure; X-ray diffraction; ARAGONITE PLUS MAGNESITE; HIGH-PRESSURE; SYSTEM CACO3-MGCO3; TEMPERATURE; CALCITE; BEHAVIOR; REFINEMENT; TRANSITION;
D O I：
10.1007/s00269-012-0489-9
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A combined powder and single-crystal X-ray diffraction analysis of dolomite [CaMg(CO3)(2)] heated to 1,200A degrees C at 3 GPa was made to study the order-disorder-reorder process. The order/disorder transition is inferred to start below 1,100A degrees C, and complete disorder is attained at approximately 1,200A degrees C. Twinned crystals characterized by high internal order were found in samples annealed over 1,100A degrees 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.
引用
收藏
页码：319 / 328
页数：10
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