Factors controlling the transformation of natural ikaite from Shiowakka, Japan
Factors controlling the transformation of natural ikaite from Shiowakka, Japan
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日本盐瓦卡天然伊卡石转化的控制因素
DOI：
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
Toshihiko Ito
中科院分区：
文献类型：
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作者：
Toshihiko Ito
在常温常压下，钙钛矿（CaCO3·6H2O）转变为方解石、文石和/或水晶石，它们是碳酸钙的多晶态。在室内，水的存在促进天然钙钛矿向方解石的转变，但溶液中镁离子的存在降低了转变速率。与碳酸氢钙溶液相接触的温度和镁离子浓度对转化过程中碳酸钙多晶的形成有影响，类似于碳酸氢钙溶液中碳酸钙多晶的形成。易钛石的快速转变有利于形成一种亚稳相——钒钛石。
Ikaite (CaCO3·6H2O) transforms to calcite, aragonaite and/or vaterite, which are the polymorphs of calcium carbonate, at normal temperature and pressure. The presence of water promotes the transformation of natural ikaite to calcite in a room but the presence of magnesium ion in a solution reduces the transformation rate. The formation of calcium carbonate polymorphs through the transformation is influenced by temperature and magnesium ion concentration in a solution which contacts with ikaite, being analogous to those on the formation of calcium carbonate polymorphs from calcium bicarbonate solution. Rapid transformation of ikaite is favorable to the formation of vaterite, a metastable phase.