Infrared Absorption Spectra of α and β-Calcium Sulphate Hemihydrates

Abstract

IN their recent communication concerning the application of infrared spectroscopy to the calcium sulphate–water system, Bensted and Prakash1 stated that they obtained no spectral differences between the α and β forms of the hemihydrate. I would like to report that I have found differences in the spectral range 1,200 to 1,000 cm−1 associated with the vibrations of the tetrahedral SO4 ion as shown in Table 1.

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References

  1. 1

    Bensted, J., and Prakash, S., Nature, 219, 60 (1968).

  2. 2

    Holdridge, D. A., Trans. Brit. Ceram. Soc, 64, 211 (1965).

  3. 3

    Holdridge, D. A., and Walker, E. G., Trans. Brit. Ceram. Soc., 66, 485 (1967).

  4. 4

    ASTM E 168–64T General Techniques of Infrared Quantitative Analysis, section 5e.

  5. 5

    Duyckaerts, G., The Analyst, 84, 201 (1959).

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BARTRAM, D. Infrared Absorption Spectra of α and β-Calcium Sulphate Hemihydrates. Nature 223, 494 (1969). https://doi.org/10.1038/223494a0

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