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High Temperature XRD Studies of Selected Carbonate Minerals

  • S. S. Iyengar (a1), P. Engler (a1), M. W. Santana (a1) and E. R. Wong (a1)

Extract

Thermal analysts have exploited the sensitivity of carbonate mineral decomposition to furnace atmosphere as a diagnostic tool for identifying and quantifying these minerals in mixtures and solid solutions (1-3). However, thermal analysis techniques alone cannot reveal information about the reaction products after each thermal event. In-situ high temperature x-ray diffraction is one technique that can identify these products. Using this technique, Kissinger et al. (4) identified the reaction products of the thermal decomposition of reagent grade FeCO3 (siderite) and MgCO3 (magnesite). However, the thermal behavior of analytical reagent grade carbonates differs from natural minerals (1). Milodowski and Morgan (5) used in-situ XRD to investigate the thermal behavior of the dolomite-ankerite series.

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1. Webb, T. L. and Kruger, J.E., Carbonates, in: “Differential Thermal Analysis”, Volume 1, Mackenzie, R. C., ed., Academic Press, New York (1970).
2. Warne, St.J. S., Predictable Curve Modifications and Variable Atmosphere DTA: Uses in Diagnostic Mineralogy, Particularly for Carbonates, in “Thermal Analysis, ICTA 80”, Volume 2, Hemminger, W., ed. Birkhaeuser Verlag, Boston (1981).
3. Warne, S.St.J., Morgan, D. J., and Milodowski, A.E., Thermal Analysis Studies of the Dolomite, Ferroan Dolomite, Ankerite Series, Part 1 Iron Content Recognition and Determination by Variable Atmosphere DTA, Thermochim. Acta, 51:105 (1981).
4. Kissinger, H. E., McMurdie, H. F., and Sirapson, E.S., Thermal Decomposition of Manganous and Ferrous Carbonates, J. Amer. Ceramic. Soc., 39:168 (1956).
5. Milodowski, A. E. and Morgan, D.J., Thermal Decomposition of Minerals of the Dolomite-Ankerite Series in a Carbon Dioxide Atmosphere in: “Proc. of the Second ESTA,” Heyden, London (1981).
6. Mittleman, M. L., Compton, D. A. and Engler, P., Interfacing a TGA with an Inexpensive, Mobile FT-IR, Proc. of the 13th MATAS Conf. (1984)
7.Unpublished results.

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