AN IMPORTANT ROLE OF TDPAC TECHNIQUE IN THE MEASUREMENTS OF HYPERFINE PARAMETERS IN PHASES OF Hf-Fe PHASE SYSTEM

摘要

There are numerous experimental techniques available to study solids. Among them, an outline of the basic principles of hyperfine interactions, the Time Differential Perturbed Angular (TDPAC) coincidence technique is described and particular attention is paid to information that can be obtained from a TDPAC experiment. This time the research goal was to study intemetallic compounds, present in Hf-Fe phase system. In the course of studing the hyperfine interactions of ~(181)Ta in paramagnetic Hf_2Fe and ferromagnetic HfFe_2 sample-materials, the time differential PAC spectra were recorded with a two-detector arrangement at characteristic temperatures. These measurements provide information on the chemical environment of observed ion probe. Electronic structure calculations were performed with WIEN 97-FLAPW program package in order to relate measured hyperfine fields at sites of ~(181)Ta ion probes in both compounds to particular chemical and physical properties of the neighbourhood and even of the material as a whole. In comparison experimental and calculated data, there is a pretty good agreement.