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- W1980715422 abstract "The optical properties of isomorphous mixtures produced in the laboratory have been studied by various crystallographers since the time of Senarmont, who found that the optic axial angle of mixtures of the potassium and ammonium-seignette salts was intermediate between those of the simple salts and varied gradually with the composition of the mixtures. Such artificially prepared mixtures offer better material for investigation than do the mixtures occurring as minerals, since their composition is simpler and can be varied at will. The first quantitative results were obtained by Dufet, who measured the mean refractive index (β) of mixtures of the orthorhombic sulphates of magnesium and nickel and enunciated the law: The differences between the refractive indices of a mixture of two isomorphous salts and those of the component salts are inversely proportional to the numbers of molecules of the two salts in the mixture.” This is equivalent to the statement that in (orthorhombic) mixed crystals the refractive index of a mixture is a linear function of its composition as expressed in molecular percentage. Thus, if N n' n are the refractive indices of the mixed crystal and of the two components, respectively, and m' m are the molecular percentages of the two components N = m'n' + mn /100." @default.
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- W1980715422 date "1925-09-01" @default.
- W1980715422 modified "2023-09-25" @default.
- W1980715422 title "A contribution to the study of the optical properties of mixed crystals" @default.
- W1980715422 doi "https://doi.org/10.1098/rspa.1925.0108" @default.
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