The ikaite-to-vaterite transformation: new evidence from diffraction and imaging
Vaterite is one of three polymorphs of calcium carbonate (CaCO3) found in nature, the others being calcite and aragonite. Here the formation of vaterite from decomposition of ikaite (CaCO3·6H2O) was investigated using synchrotron powder diffraction and scanning electron microscopy. The crystallite s...
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| Veröffentlicht in: | Journal of applied crystallography 2009-04, Vol.42 (2), p.225-233 |
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| container_title | Journal of applied crystallography |
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| creator | Tang, C. C. Thompson, S. P. Parker, J. E. Lennie, A. R. Azough, F. Kato, K. |
| description | Vaterite is one of three polymorphs of calcium carbonate (CaCO3) found in nature, the others being calcite and aragonite. Here the formation of vaterite from decomposition of ikaite (CaCO3·6H2O) was investigated using synchrotron powder diffraction and scanning electron microscopy. The crystallite sizes of vaterite (∼40 nm) were found to be much smaller than those of the precursor ikaite (∼0.5–1.0 µm) as a result of vaterite nucleating as ikaite dehydrates. The rate of decomposition to vaterite increases with temperature, indicating kinetic control of this transformation. It is postulated that the structural arrangement of the hydration sphere around Ca2+ in ikaite determines the orientation of Ca2+ and CO32− ions such that vaterite nucleates upon dehydration. This implies that the dehydration of a precursor hydrated phase such as ikaite is required for vaterite nucleation. |
| doi_str_mv | 10.1107/S0021889809005810 |
| format | Article |
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C. ; Thompson, S. P. ; Parker, J. E. ; Lennie, A. R. ; Azough, F. ; Kato, K.</creator><creatorcontrib>Tang, C. C. ; Thompson, S. P. ; Parker, J. E. ; Lennie, A. R. ; Azough, F. ; Kato, K.</creatorcontrib><description>Vaterite is one of three polymorphs of calcium carbonate (CaCO3) found in nature, the others being calcite and aragonite. Here the formation of vaterite from decomposition of ikaite (CaCO3·6H2O) was investigated using synchrotron powder diffraction and scanning electron microscopy. The crystallite sizes of vaterite (∼40 nm) were found to be much smaller than those of the precursor ikaite (∼0.5–1.0 µm) as a result of vaterite nucleating as ikaite dehydrates. The rate of decomposition to vaterite increases with temperature, indicating kinetic control of this transformation. It is postulated that the structural arrangement of the hydration sphere around Ca2+ in ikaite determines the orientation of Ca2+ and CO32− ions such that vaterite nucleates upon dehydration. This implies that the dehydration of a precursor hydrated phase such as ikaite is required for vaterite nucleation.</description><identifier>ISSN: 1600-5767</identifier><identifier>ISSN: 0021-8898</identifier><identifier>EISSN: 1600-5767</identifier><identifier>DOI: 10.1107/S0021889809005810</identifier><language>eng</language><publisher>5 Abbey Square, Chester, Cheshire CH1 2HU, England: International Union of Crystallography</publisher><subject>Calcium ; calcium carbonate ; Crystallography ; Diffraction ; Electron microscopes ; ikaite ; Mineralogy ; vaterite</subject><ispartof>Journal of applied crystallography, 2009-04, Vol.42 (2), p.225-233</ispartof><rights>International Union of Crystallography, 2009</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c4569-b6846c1adfa24e9546b862833b8b5ce32b8fc62d9ddf85b47c3fa38978b853a83</citedby></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://onlinelibrary.wiley.com/doi/pdf/10.1107%2FS0021889809005810$$EPDF$$P50$$Gwiley$$H</linktopdf><linktohtml>$$Uhttps://onlinelibrary.wiley.com/doi/full/10.1107%2FS0021889809005810$$EHTML$$P50$$Gwiley$$H</linktohtml><link.rule.ids>314,776,780,1411,27901,27902,45550,45551</link.rule.ids></links><search><creatorcontrib>Tang, C. 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The rate of decomposition to vaterite increases with temperature, indicating kinetic control of this transformation. It is postulated that the structural arrangement of the hydration sphere around Ca2+ in ikaite determines the orientation of Ca2+ and CO32− ions such that vaterite nucleates upon dehydration. This implies that the dehydration of a precursor hydrated phase such as ikaite is required for vaterite nucleation.</description><subject>Calcium</subject><subject>calcium carbonate</subject><subject>Crystallography</subject><subject>Diffraction</subject><subject>Electron microscopes</subject><subject>ikaite</subject><subject>Mineralogy</subject><subject>vaterite</subject><issn>1600-5767</issn><issn>0021-8898</issn><issn>1600-5767</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2009</creationdate><recordtype>article</recordtype><recordid>eNqFkDtPwzAUhSMEEqXwA9giBraA33bYoJQWVAqCIkbLceziPpJipy3996QKQggGpnuke777OFF0DMEZhICfPwOAoBCpACkAVECwE7UgAyChnPHdH3o_OghhAgBkHKFW9Dh6M7GbKleZpCqTlaqMr3VceVUEW_q5qlxZXMSFWcdm5XJTaBNbX87j3Fnrld62Y1XksZursSvGh9GeVbNgjr5qO3q56Y46_WTw0LvtXA4STShLk4wJwjRUuVWImJQSlgmGBMaZyKg2GGXCaobyNM-toBnhGluFRcpFJihWArej02buwpfvSxMqOXdBm9lMFaZcBokJrjeItDae_DJOyqUv6tskAhQCmhJYm2Bj0r4MwRsrF75-yG8kBHIbsPwTcM2Ihlm7mdn8D8i7zlO_Swna3pQ0qAuV-fhGlZ9KxjGn8nXYk_waXQ3vB0RC_Aktdoxp</recordid><startdate>200904</startdate><enddate>200904</enddate><creator>Tang, C. 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The rate of decomposition to vaterite increases with temperature, indicating kinetic control of this transformation. It is postulated that the structural arrangement of the hydration sphere around Ca2+ in ikaite determines the orientation of Ca2+ and CO32− ions such that vaterite nucleates upon dehydration. This implies that the dehydration of a precursor hydrated phase such as ikaite is required for vaterite nucleation.</abstract><cop>5 Abbey Square, Chester, Cheshire CH1 2HU, England</cop><pub>International Union of Crystallography</pub><doi>10.1107/S0021889809005810</doi><tpages>9</tpages></addata></record> |
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| language | eng |
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| source | Wiley Online Library Journals Frontfile Complete; Alma/SFX Local Collection |
| subjects | Calcium calcium carbonate Crystallography Diffraction Electron microscopes ikaite Mineralogy vaterite |
| title | The ikaite-to-vaterite transformation: new evidence from diffraction and imaging |
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