Doping Incompatible Elements into Calcite through Amorphous Calcium Carbonate

被引:25
作者
Matsunuma, Satoshi [1 ]
Kagi, Hiroyuki [1 ]
Komatsu, Kazuki [1 ]
Maruyama, Koji [1 ]
Yoshino, Toru [2 ]
机构
[1] Univ Tokyo, Grad Sch Sci, Geochem Res Ctr, Tokyo 1130033, Japan
[2] Tokyo Metropolitan Ind Technol Res Inst, Koto Ku, Tokyo 1350064, Japan
关键词
CRYSTALLIZATION;
D O I
10.1021/cg500953h
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Doping large amounts of a incompatible element into calcite, a polymorph of CaCO3, was achieved by pressurizing amorphous calcium carbonate (ACC) containing a dopant. Strontium-doped ACC samples were prepared from supersaturated solutions. ACC was transformed to calcite at 0.8 GPa and 25 degrees C. The lattice volume of calcite obtained by pressurizing ACC increased monotonically up to 372.5 angstrom 3 (1.3% increase from a Sr-free sample) with increasing Sr content in ACC up to 0.15 in Sr/(Sr + Ca). For comparison, the lattice volumes of calcite samples precipitated from supersaturated CaCO3 solution containing Sr were obtained, but the lattice volume of calcite precipitated from supersaturated solutions showed no noteworthy increase. Results of this study indicate that pressure-induced crystallization is an efficient pathway to dope incompatible elements into crystals.
引用
收藏
页码:5344 / 5348
页数:5
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