V. Niculescu

Properties of Heusler-type materials Fe2TSi and FeCo2Si

Abstract A number of 3d, 4d and 5d elements are substituted into Fe3Si in an attempt to form Heusler-like alloys. It is found that with the heat treatment followed, only the 3d elements V, Mn and Co form Heusler alloys. Substitution of the other elements produces polyphase materials. For such elements the limits of solubility in Fe3Si are determined. For the Heusler alloys the data on degrees of disorder, hyperfine fields and magnetization are presented. These studies, in addition, test the already known site preferences of the transition metal impurities in Fe3Si at high impurity concentrations.

Hyperfine interactions and structural disorder of Fe3Si1-xAlx alloys

Spin echo, X-ray and magnetization measurements are performed on Fe3Si1-xAlx alloys for 0<x<0.25. The results are analysed by considering near neighbour environments for various sites.

Investigation of conduction electron polarization effects in Fe3Si based ternary systems

Spin‐echo spectra of transition elements in the ternary alloys Fe3−xTxSi where T=V and show clear satellite structure for small x. For these alloys, it is concluded that changes in the ’’4s’’ CEP alone produce the satellite structure. Studies made on some Fe3Si based quarternary alloys are consistent with the above conclusions.

Magnetization and neutron diffraction studies on Mn3Si

Bulk magnetization and neutron diffraction measurements on Mn3Si are reported. Preliminary conclusions indicate a complex magnetic structure at low temperatures. The influence of dilute iron substitution on the magnetic behavior of Mn3Si is discussed.

Electrical resistivity of Fe dissolved in PdAg matrix alloys

Abstract The temperature dependence of the resistivities of the system Pd1−xAgx up to x = 0.5, doped with 0.5, 1.0 and 2 at.% Fe has been measured. Clear reduction in the resistivities near the ferromagnetic and spin glass ordering temperatures are observed. The resistance minima observed in some of these alloys are discussed in terms of local s-d effects.