Doping Incompatible Elements into Calcite through Amorphous Calcium Carbonate
Doping Incompatible Elements into Calcite through Amorphous Calcium Carbonate
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DOI：
10.1021/cg500953h
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发表时间：
2014-11-01
影响因子：
3.8
通讯作者：
Yoshino, Toru
中科院分区：
文献类型：
--
作者：
Matsunuma, Satoshi;Kagi, Hiroyuki;Yoshino, Toru
通过对含有掺杂剂的无定形碳酸钙（ACC）加压，将大量不相容元素掺杂到碳酸钙的多晶型物方解石中。锶掺杂的ACC样品从过饱和溶液中制备。ACC在0.8 GPa和25 ℃下转化为方解石。通过加压ACC获得的方解石的晶格体积随着ACC中Sr含量的增加而单调增加至372.5埃3（从无Sr样品增加1.3%），以Sr/（Sr + Ca）计增加至0.15。作为比较，从过饱和CaCO 3溶液中沉淀的方解石样品的晶格体积得到的含Sr，但从过饱和溶液中沉淀的方解石的晶格体积没有表现出显着的增加。研究结果表明，压力诱导晶化是向晶体中掺杂不相容元素的有效途径。
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.