The local densities of conduction s-electrons in the grain boundary cores of transition and noble metals were determined. The differences between the isomer shifts of the components of nuclear gamma resonance emission spectra, due to 57Co probes which occupied states in lattice sites and in the grain-boundary core were corrected for the changes in volume of these probes in the given locations. The corrected values of the differences between isomer shifts indicated a low density of s-electrons at the substitutional and interstitial sites of the grain-boundary core-structure. The magnetic ordering temperature of so-called nearly ferromagnetic, Pd and Pt, matrices was proportional to the density of conduction electrons. Different Curie temperatures in the lattice and the grain-boundary cores of these metals also suggested a lower density of electrons (as compared with the corresponding lattice sites) at interstitial sites of the grain-boundary core-structure.

Electronic Properties of the Grain Boundary Core in Polycrystals of Cubic Metals. S.M.Klotsman, V.N.Kaigorodov: Materials Science Forum, 1999, 294-296, 715-8