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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Silicon carbonate phase formed from carbon dioxide and silica under pressure
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Silicon carbonate phase formed from carbon dioxide and silica under pressure

机译：在压力下由二氧化碳和二氧化硅形成的碳酸硅相

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摘要

The discovery of nonmolecular carbon dioxide under high-pressure conditions shows that there are remarkable analogies between this important substance and other group IV oxides. A natural and long-standing question is whether compounds between CO_2 and SiO_2 are possible. Under ambient conditions, CO_2 and SiO_2 are ther-modynamically stable and do not react with each other. We show that reactions occur at high pressures indicating that silica can behave in a manner similar to ionic metal oxides that form carbonates at room pressure. A silicon carbonate phase was synthesized by reacting silicalite, a microporous SiO_2 zeolite, and molecular CO_2 that fills the pores, in diamond anvil cells at 18-26 GPa and 600-980 K; the compound was then temperature quenched. The material was characterized by Raman and IR spectroscopy, and synchrotron X-ray diffraction. The experiments reveal unique oxide chemistry at high pressures and the potential for synthesis of a class of previously uncharacterized materials. There are also potential implications for CO_2 segregation in planetary interiors and for CO_2 storage.
机译：在高压条件下发现的非分子二氧化碳表明，这种重要物质与其他IV类氧化物之间存在明显的类比。一个长期存在的自然问题是，CO_2和SiO_2之间的化合物是否可能存在。在环境条件下，CO_2和SiO_2是热力学稳定的，不会相互反应。我们表明，反应在高压下发生，这表明二氧​​化硅的行为类似于在室温下形成碳酸盐的离子金属氧化物。通过在18-26 GPa和600-980 K的金刚石砧室中使硅沸石，微孔SiO_2沸石和填充孔的分子CO_2反应，合成了碳酸硅相。然后将化合物温度淬灭。该材料通过拉曼光谱和红外光谱以及同步加速器X射线衍射进行表征。实验揭示了在高压下独特的氧化物化学以及合成一类以前未表征的材料的潜力。行星内部的CO_2隔离和CO_2的储存也可能具有潜在的意义。

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  • 作者

    Mario Santoro; Federico Gorelli; Julien Haines; Olivier Cambon; Claire Levelut; Gaston Garbarino;

  • 作者单位

    European Laboratory for Nonlinear Spectroscopy, Via Nello Carrara 1, 50019 Sesto Fiorentino, Italy,lstituto per i Processi Chimico-Fisici-Consiglio Nazionale delle Ricerche, Unita Organizzativa di Supporto di Roma, Piazzale Aldo Moro 2,00185 Rome, Italy;

    European Laboratory for Nonlinear Spectroscopy, Via Nello Carrara 1, 50019 Sesto Fiorentino, Italy,Institut Charles Gerhardt Montpellier,Equipe Chimie et Cristallochimie des Materiaux, Unite Mixte de Recherche 5253, Centre National de la Recherche Scientifique, Universite Montpellier 2,Place Eugene Bataillon, cc1504, 34095 Montpellier Cedex 5, France;

    Institut Charles Gerhardt Montpellier,Equipe Chimie et Cristallochimie des Materiaux, Unite Mixte de Recherche 5253, Centre National de la Recherche Scientifique, Universite Montpellier 2,Place Eugene Bataillon, cc1504, 34095 Montpellier Cedex 5, France;

    Institut Charles Gerhardt Montpellier,Equipe Chimie et Cristallochimie des Materiaux, Unite Mixte de Recherche 5253, Centre National de la Recherche Scientifique, Universite Montpellier 2,Place Eugene Bataillon, cc1504, 34095 Montpellier Cedex 5, France;

    Laboratoire Charles Coulomb, Unite Mixte de Recherche 5221, Centre National de la Recherche Scientifique, Universite Montpellier 2, Place Eugene Bataillon, ccO26, 34095 Montpellier Cedex 5, France;

    European Synchrotron Radiation Facility, 38343 Grenoble, France;

  • 收录信息 美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    high-pressure chemistry; material science; optical spectroscopy;

    机译：高压化学材料科学;光谱学;

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