It is shown that the lattice parameter may be expected to change upon substitution of heavier isotopes by lighter ones in crystalline modifications of boron and their solid solutions and compounds. This isotopic effect is estimated using the diatomic model and semiclassical B-B interatomic interaction potential. The maximum percent change in the lattice parameter after substitution of all 11 B atoms by 10 B atoms is estimated at 0.42%. This value is of the same order of magnitude as the isotopic changes in the lattice parameter measured in boron carbides.

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