Abstract
THE structure of two forms of phosphorus pentoxide was determined several years ago1,2. Indications of the existence of a third form has been found in a study of the phase diagram by Hoeflake and Scheffer3. Actually, in our former investigations we found occasionally a third kind of crystals, and we determined their cell dimensions and space group4. However, we were not sure that these crystals were pure phosphorus pentoxide and not a reaction product with the glass wall, to which they adhere extremely firmly. Hill, Faust and Hendricks5 put the existence of a third form beyond doubt. They considered the modification as probably tetragonal (instead of orthorhombic, as found by us), as a result of optical investigation. According to their powder diagram data, however, it is certain that their crystals are identical with those described by us4.
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References
de Decker, H. C. J., and MacGillavry, C. H., Rec. Trav. Chim., 60, 153 (1941).
de Decker, H. C. J., Rec. Trav. Chim., 60, 413 (1941).
Hoeflake, J. M. A., and Scheffer, F. E. C., Rec. Trav. Chim., 45, 191 (1926).
de Decker, H. C. J., Thesis (Utrecht, 1941). MacGillavry, C. H., and de Decker, H. C. J., Chem. Weekbl., 39, 227 (1942).
Hill, W. L., Faust, G. T., and Hendricks, S. B., J. Amer. Chem. Soc., 65, 794 (1943).
Ketelaar, J. A. A., Nature, 137, 316 (1936); Z. Krist., 95, 9 (1936).
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MACGILLAVRY, C., DE DECKER, H. & NIJLAND, L. Crystal Structure of the Third Form of Phosphorus Pentoxide. Nature 164, 448–449 (1949). https://doi.org/10.1038/164448b0
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DOI: https://doi.org/10.1038/164448b0
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