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The frequency spectrum of the normal vibrations of a body-centered cubic crystal lattice is derived by a method suggested by Houston, in which the secular equation is solved along three lines in the reciprocal lattice and the result is interpolated by means of suitably chosen spherical harmonics. Some corrections are applied to the high-frequency part of the spectrum, and the lattice part of the specific heat of metallic sodium is calculated as a function of temperature.
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E. Bauer (1953) studied this question.
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