碳酸钙多形球文石的非水形成：天体物理学意义
Non-aqueous formation of the calcium carbonate polymorph vaterite: astrophysical implications
摘要：
我们研究碳酸钙的形成，通过固体-气体相互作用的无定形钙硅酸盐与气态CO2，在高压下，并将此链接到可能存在的碳酸钙在一些拱星和行星环境。我们使用原位同步辐射X射线粉末衍射，以获得有关的结晶碳酸钙相球文石的形成及其随温度的演变详细的结构数据。我们发现，亚稳碳酸钙相球霰石形成旁边的方解石，在升高的CO2压力，在室温下，随后保持稳定的温度和压力范围很大。我们报告了碳酸钙矿物球晶石的形成，同时试图模拟天体物理环境中碳酸盐尘埃颗粒的形成。这表明球文石可能是碳酸盐尘埃的矿物成分，也提出了在行星表面形成球文石及其多晶型物的可能方法。
英文摘要：
We study the formation of calcium carbonate, through the solid-gas interaction of amorphous Ca-silicate with gaseous CO2, at elevated pressures, and link this to the possible presence of calcium carbonate in a number of circumstellar and planetary environments. We use in-situ synchrotron X-Ray powder diffraction to obtain detailed structural data pertaining to the formation of the crystalline calcium carbonate phase vaterite and its evolution with temperature. We found that the metastable calcium carbonate phase vaterite was formed alongside calcite, at elevated CO2 pressure, at room temperature and subsequently remained stable over a large range of temperature and pressure. We report the formation of the calcium carbonate mineral vaterite whilst attempting to simulate carbonate dust grain formation in astrophysical environments. This suggests that vaterite could be a mineral component of carbonate dust and also presents a possible method of formation for vaterite and its polymorphs on planetary surfaces.
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