Investigation into thermoelectromotive force induced by internal adsorption in binary iron base alloys

The behaviour of an alloying element atom was examined within the zone of intercrystalline internal adsorption, and expecially that connected with magnetic interactions in binary alloys of iron with transition, as well as with non-transition metals. Binary Fe-Me alloys are chosen, where Me is Ti, V, Cr, Mn, Co, Ni, Cu, Zn, Ga, Ge, and As, added in an amount of about 1 wt.%. The thermoelectromotive force of Fe- Me alloys was measured with respect to pure iron, as well as the thermoelectromotive force of the pairs of coarse-grained and fine-grained alloys of the same composition. The measured thermoelectromotive force was subdivided into two components attributable to the intercrystalline internal adsorption: the primary (boundary) and the secondary (lattice) component. This subdivision has been carried into effect by two methods according to independent data; as a result, a good agreement between the results has been obtained. The dependence of the lattice thermoelectromotive force on the atomic number z of an alloying addition is in a good agreement with the dependence of the calculated values of the pendulum disturbance which has been introduced by the atom of an addition into the lattice of iron. The boundary thermoelectromotive force depends in a nonmonotonous manner on z. However, no good correlation with the magnetic disturbances has been detected for the former. It has been established that the lattice and the boundary thermoelectromotive force possess opposite signs for all the alloys, with the exception of Fe-Ga alloy which gives an abnormally high positive boundary thermoelectromotive force