Thermoelectromotive force of a superconductor versus the non-superconducting state is calculated on the basis of the theory of conductivity by Bloch. In. ideal pure superconductors the electromotive force Φ is proportional to (Tc
4N
2/3/_??_
2n
4/3)(1-(T/Tc)
4), where _??_ is the Debye temperature, N nambers of atoms per 1cm
3, n numbers of electrons per 1cm
3 and Tc the transition temperature. In real substances, however the impurity scattering predominates from other scatterings, as in Sn, In, Ta, Al, Tl, ctc., Φ∝Tc
2(1-(T/Tc)
2), but when the lattice vibration scattering is larger than or comparalle with the impurity scattering, as in the spectroscopic pure Hg, Pb, Φ is approximately proportional to (Tc
3N
2/3/_??_n
4/3)(1-(T/Tc)
3). These conclusions are compared with Steele's measurements.
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