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- Kevin J. Davis
- Department of Geological Sciences, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061, USA.
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- Patricia M. Dove
- Department of Geological Sciences, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061, USA.
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- James J. De Yoreo
- Department of Chemistry and Materials Science, Lawrence Livermore National Laboratory, Livermore, CA 94550, USA.
書誌事項
- 公開日
- 2000-11-10
- DOI
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- 10.1126/science.290.5494.1134
- 公開者
- American Association for the Advancement of Science (AAAS)
この論文をさがす
説明
<jats:p> Magnesium is a key determinant in CaCO <jats:sub>3</jats:sub> mineralization; however, macroscopic observations have failed to provide a clear physical understanding of how magnesium modifies carbonate growth. Atomic force microscopy was used to resolve the mechanism of calcite inhibition by magnesium through molecular-scale determination of the thermodynamic and kinetic controls of magnesium on calcite formation. Comparison of directly measured step velocities to standard impurity models demonstrated that enhanced mineral solubility through magnesium incorporation inhibited calcite growth. Terrace width measurements on calcite growth spirals were consistent with a decrease in effective supersaturation due to magnesium incorporation. Ca <jats:sub> 1− <jats:italic>x</jats:italic> </jats:sub> Mg <jats:sub> <jats:italic>x</jats:italic> </jats:sub> CO <jats:sub>3</jats:sub> solubilities determined from microscopic observations of step dynamics can thus be linked to macroscopic measurements. </jats:p>
収録刊行物
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- Science
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Science 290 (5494), 1134-1137, 2000-11-10
American Association for the Advancement of Science (AAAS)
