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On the atomic volume relations in certain isomorphous series

Published online by Cambridge University Press:  14 March 2018

A. F. Hallimond
A. F. Hallimond*
Affiliation:
Museum of Practical Geology, London1
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Extract

Considerable interest attaches to the estimation of the volume occupied by the several atoms in a crystalline compound. For the complete molecule a volume can at once be calculated from the density and the chemical composition, but the further subdivision of this space into domains belonging to the constituent atoms or groups can only be made by methods that are limited and frequently very indirect. In general, the volume is not additive, and. it seems clear that the same atom may occupy very different volumes in its different compounds; indeed, it is only within the limits of a truly isomorphous series that the volume can be treated as an additive property. But even in this case it is not possible directly to calculate volumes for the constituents of the molecule if the chemical formulae are of the same type throughout; when, however, the formulae differ in type a solution may be possible.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 21 , Issue 118 , September 1927 , pp. 277 - 284
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1927

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References

page 277 note 2 A. F. Hallimond, Min. Mag., 1927, vol. 217 pp. 195-204.

page 279 note 1 See Landolt-Börnstein, Physikalisch-chemische Tabellen, 1920 edition.

page 279 note 2 A. E. H. Tutton; see P. Groth, Chem. Kryst., vol. 2, pp. 823, 326, 490.

page 279 note 3 A. E. H. Tutton, Proc. Roy. Soc. London, Ser. A, 1926, vol. 111, pp. 462-491. [Min. Abstr., vol. 3, p. 161.]

page 279 note 4 Values taken from P. Groth, loc. cit.

page 279 note 5 A. E. H. Tutton, Crystalline structure and chemical constitution, 1910, p. 125.

page 279 note 6 The series in Table I relate to three metals only, but if more than three eutropic metals were available the relation would probably extend to them also.

page 281 note 1 See Landolt-Börnstein, Physikalisch-chemische Tabellen, 1920 edition.

page 281 note 2 Values taken from P. Groth, loc. cit.

page 281 note 3 W. Mellor, 7 Treatise on inorganic chemistry.

page 281 note 4 Values obtained from X-ray measurements, A. Claassen, Recueil Tray. Chim. Pays-Bas, 1925, vol. 44, pp. 790-794. [Min. Abstr. 7 vol. 3, p. 245.]

page 281 note 5 Landolt-Börnstein, loc. cit. No crystal measurements available.

page 282 note 1 See P. Groth, Chemische Krystallographie, 1906, vol. 1, pp. 1657 166.

page 283 note 1 T. W. Richards, Journ. Amer. Chem. Sec., 1923, vol. 45, pp. 422-437.

page 283 note 2 See J. W. Mellor, Treatise on inorganic chemistry, 1922, vol. 2, pp. 50 and 66.