Effect of impurities on the residual resistivity of refractory metals

The values or Δρ0/c (change in the residual resistivity of the metal-matrix accompanying dissolution of 1 at. % impurity) for 8−14 different impurities in each of the seven metals W, Re, Ta, Mo, Ru, Ir, and Rh, are determined from the published experimental data on the dependences of the resistivity ρ for these metals on the concentration c of the dissolved impurity. The change in Δρ0/c as a function of the mutual position of the impurity and the matrix in the periodic table is studied. The values of Δρ0/c are predicted for the impurities Cr, Os, Tc, and Mn in several matrices. It is established that the effect of oxygen on the residual resistivity ρ0 for group V metals is weaker than for group IV metals.

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