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The effect of isotopic mass on elastic properties of solids was studied by measuring the elastic modulus of isotopically-concentrated polycrystalline specimens of metallic lithium at 25^∘{}C. The elastic modulus of lithium-6 (96.1% Li⁶, 3.9% Li⁷) was found to be (7.93±{}0.21)×{}10¹⁰ dynes/cm², and that of lithium-7 (7.5% Li⁶, 92.5% Li⁷) (7.98±{}0.33)×{}10¹⁰ dynes/cm². Within the limits of precision of the experiments, the values do not differ. It is concluded that isotopic mass has no effect on static elastic properties other than that arising from the change in lattice constants.
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Robertson et al. (1960) studied this question.
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