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- W2034113742 abstract "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." @default.
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- W2034113742 date "2008-01-01" @default.
- W2034113742 modified "2023-10-01" @default.
- W2034113742 title "Transformation kinetics of monohydrocalcite to aragonite in aqueous solutions" @default.
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- W2034113742 doi "https://doi.org/10.2465/jmps.080619" @default.
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