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Transformation kinetics of monohydrocalcite to aragonite in aqueous solutions
http://hdl.handle.net/2297/46892
http://hdl.handle.net/2297/468922b5c9e73-c509-44f5-83fe-93f698537f1e
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
OC-PR-FUKUSHI-K-345.pdf (357.9 kB)
Download is available from 9999/12/31.
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| Item type | 学術雑誌論文 / Journal Article(1) | |||||
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| 公開日 | 2017-11-09 | |||||
| タイトル | ||||||
| タイトル | Transformation kinetics of monohydrocalcite to aragonite in aqueous solutions | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
| 資源タイプ | journal article | |||||
| 著者 |
Munemoto, Takashi
× Munemoto, Takashi× Fukushi, Keisuke |
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| 書誌情報 |
Journal of Mineralogical and Petrological Sciences 巻 103, 号 5, p. 345-349, 発行日 2008-10-01 |
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| ISSN | ||||||
| 収録物識別子タイプ | ISSN | |||||
| 収録物識別子 | 1345-6296 | |||||
| NCID | ||||||
| 収録物識別子タイプ | NCID | |||||
| 収録物識別子 | AA11460926 | |||||
| DOI | ||||||
| 関連タイプ | isIdenticalTo | |||||
| 識別子タイプ | DOI | |||||
| 関連識別子 | 10.2465/jmps.080619 | |||||
| 出版者 | ||||||
| 出版者 | 日本鉱物科学会 = Japan Association of Mineralogical Sciences | |||||
| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | Monohydrocalcite (CaCO3·H2O; MHC) is a rare mineral in geological settings. It is metastable with respect to calcite and aragonite. This metastability of MHC is considered to make it a rare mineral in geological settings. Alteration experiments of MHC in aqueous solutions in a closed system were conducted at temperatures between 10 and 50 °C in order to measure its metastability quantitatively. In the present study, monohydrocalcite transformed to aragonite with time. There are two rate-limiting steps in the transformation of monohydrocalcite to aragonite: the nucleation and crystal growth of aragonite. On the other hand, the dissolution of monohydrocalcite is a faster process than the nucleation and crystal growth of aragonite. The amounts of aragonite were calculated from the X-ray diffraction (XRD) intensity to evaluate the rate of both the processes at different temperatures. The induction times for the nucleation of aragonite were estimated to be 2.7 ± 0.9×103, 5.4 ± 1.8×103, 3.2 ± 0.4×104, and 7.3 ± 0.4×105 s at 50, 40, 25, and 10 °C, respectively. The conventional rate constants by assuming a zero-order reaction of aragonite crystal growth were estimated to be 1.0 ± 0.3×10−5, 6.1 ± 0.8×10−5, 1.0 ± 0.3×10−5, and 1.6 ± 0.3×10−6 mmol·s−1 at 10, 25, 40, and 50 °C, respectively. From Arrhenius plots, the apparent activation energies were estimated to be 108.1 kJ·mol−1 and 80.7 kJ·mol−1 for the nucleation and crystal growth steps, respectively. | |||||
| 内容記述 | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | 出版者照会後に全文公開 | |||||
| 権利 | ||||||
| 権利情報 | Copyright © Japan Association of Mineralogical Sciences | |||||
| 著者版フラグ | ||||||
| 出版タイプ | VoR | |||||
| 出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||
| 関連URI | ||||||
| 識別子タイプ | URI | |||||
| 関連識別子 | http://jams.la.coocan.jp/ | |||||
| 関連URI | ||||||
| 識別子タイプ | URI | |||||
| 関連識別子 | https://www.jstage.jst.go.jp/browse/jmps | |||||
