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Magnetostriction measurements on mixed crystals Fe3-xTixO4 are reported for the temperature range of 77 to 300 K. The magnetostriction constants λ111 and λ100 increase strongly by the presence of tetrahedral Fe2+ ions. The uncertainty about the valency distribution in the mixed crystals interfered with the explanation of the composition dependence of the magnetostriction. The magnetostriction data do not exclude the presence of tetrahedral Fe2+ for the compositions x < 0.5

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