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On the atomic volume relations in certain isomorphous series. II

Published online by Cambridge University Press:  14 March 2018

A. F. Hallimond
A. F. Hallimond*
Affiliation:
Assistant Curator, Museum of Practical Geology, London
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Extract

The isomorphous replacement of one element by another, in a pair of crystalline salts, is usually accompanied by a substantial change in the molecular volume. This progression is exceptionally well illustrated in the 'eutropic' elements K, Rb, Cs, and Cl, Br, I, which formed the subject of the first part of this paper. It was there shown that the differences produced by interchanging these elements stood in the same ratio in all the salt-series, though the size of the differences varied with the acid radicle. The object of the present note is to draw attention to the existence of similarly constant (though different) ratios for the salts of O, S, Se, Te, and for the salts of Ca, Sr, Ba. The spacings in these compounds have recently been obtained by X-ray determinations, in many cases due to u M. Goldschlnidt and his co-workers, so that it is possible to verify the rule of proportional differences in these series, although the results do not possess an accuracy so high as that of densities measured by the pyknometer.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 21 , Issue 121 , June 1928 , pp. 480 - 484
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1928

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References

page 480 note 2 Hallimond, A. F., Min. Mag., 1927, vol. 21, pp. 277-284 Google Scholar (Tables I-V).

page 480 note 3 E. W. G. Wyckoff, The structure of crystals, 1924, p. 203.

page 481 note 1 Goldschmidt, V. M., Geochemische Verteilungsgesetze der Elemente, VIII. Skrifter Norske Vidensk.-Akad. I. Mat.-nat. Kl. Oslo, 1927, no. 8 (for 1926), p. 20 Google Scholar. [Min. Abstr., vol. 3, p. 326.]

page 481 note 2 Mellor, J. W., Treatise on Inorganic Chemistry, 1923, vol. 3, p. 631 Google Scholar.

page 481 note 3 Goldschmidt, V. M., Geochemische Verteilungsgesetze der Elemente, VIII. 1927, p. 56 Google Scholar.

page 481 note 4 Goldschmidt, V. M., Geochemische Verteilungsgesetze der Elemente, VII. 1926, p. 79. Retaining the earlier (comparable) value for CaTiO3 Google Scholar.

page 481 note 5 Eskola, P., Amer. Journ. Sci., 1922, ser. 5, vol. 4, p. 370 Google Scholar.

page 481 note 6 Groth, P., Chemische Krystallographie, 1908, vol. 2, p. 104.Google Scholar

page 481 note 7 Mellor, J. W., Treatise on Inorganic Chemistry, 1924, vol. 5, p. 860 Google Scholar.

page 482 note 1 See Goldschmidt, V. M., Geochemische Verteilungsgesetze der Elemente, VIII. 1927, pp. 144 Google Scholar, 146, 147.

page 483 note 1 Goldschmidt, V. M., Geochemische Verteilungsgesetze der Elemente, VIII. 1927, p. 57, &c.Google Scholar

page 483 note 2 V. M. Goldsclimidt, op. cit., No. VII, p. 15.