The time differential perturbed angular correlation study of the Ni–5 at.% Hf alloy

Abstract

The time differential perturbed angular correlation technique was used to observe the magnetic dipole and electric quadrupole interactions of 181Ta probe in the Ni–5 at.% Hf alloy from 78 to 1131 K. The presence of the Larmor precession frequency of 181Ta in the Ni(Hf) solid solution phase confirms the Ni dominant concentration for the onset of ferromagnetism in the Ni–Hf alloys. A very weak quadrupole interaction originates from imperfections in the HfNi 5 phase formed during melting procedure. The third observed quadrupole interaction corresponds to the Ta probe in the HfO 2 contamination due to internal oxidation of the sample.