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X-Ray Diffraction Analysis of the Calcium Carbonate Polymorphs

Published online by Cambridge University Press:  06 March 2019

S. T. Silk  and
S. Z. Lewin
S. T. Silk
Affiliation:
Department of Chemistry, New York University, 4 Washington Place, Room 410, New York, N. Y. 10003
S. Z. Lewin
Affiliation:
Department of Chemistry, New York University, 4 Washington Place, Room 410, New York, N. Y. 10003
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Abstract

It is shown that the integrated intensities of diffraction lines from calcite and aragonite powders prepared by precipitation vary markedly, due to variations in sample packing efficiency arising from different degrees of polydispersity in the particle size distributions. Since prolonged grinding to equalize initially divergent distributions changes the polymorph composition, the packing effect imposes the principal limitation on the precision of the x-ray method for certain types of calcium carbonate preparations.

Information

Type
Research Article
Information
Advances in X-Ray Analysis , Volume 14: Nineteenth Annual Conference on Applications of X-ray Analysis, August 5-7, 1970 , 1970 , pp. 29 - 37
Copyright
Copyright © International Centre for Diffraction Data 1970

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References

Davies, T. T. and Hooper, P. H., “The Determination of the Calcite: Aragonite Ratio in Mollusc Shells by X-Ray Diffraction,” Mineral. Mag., 53, 608-12 (1963).Google Scholar
Turekian, K. K. and Armstrong, R. L., “Magnesium, Strontium, and Barium Concentrations and Calcite-Aragonite Ratios of Some Recent Molluscan Shells,” J. Marine Res., 18, 133-51 (1960).Google Scholar
Pitchford, A. H., “A High-Speed, Selective Uniform-Particle-Size Grinder for the Preparation of Analytical Samples,” in Mueller, W. M., Editor, Advances in X-Ray Analysis, vol. 4, pp. 547-54, Plenum Press (1960).Google Scholar
Northwood, D. O. and Lewis, D., “Transformation of Vaterite to Calcite during Grinding,” Amer. Mineral., 53, 2089-92 (1968).Google Scholar
Schrader, R. and Hoffman, B., “Enantiotropic Transformation of Calcite-Aragonite by Mechanical Forces,” Z. Chem., 6, 388-9 (1966).Google Scholar