Vegard's law (Mineralogy 💎)

In crystallography, materials science and metallurgy, Vegard's law is an empirical finding resembling the rule of mixtures. In 1921, Lars Vegard discovered that the lattice parameter of a solid solution of two constituents is approximately a weighted mean of the two constituents' lattice parameters at the same temperature: a A ( 1 − x ) B x ...

https://en.wikipedia.org/wiki/Vegard's_law

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