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

• Published in: Journal of alloys and compounds Vol. 480; no. 1; pp. 40 - 42
• Main Authors: Cekić, B., Umićević, A., Ivanovski, V., Koteski, V., Belošević-Čavor, J., Pavlović, S.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Kidlington Elsevier B.V 01-07-2009; Elsevier
• Subjects: Angular correlation; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Exact sciences and technology; Hafnium oxide; Hyperfine interactions; Intermetallics; Larmor precession; Magnetic resonances and relaxations in condensed matter, mössbauer effect; Melting; Mössbauer effect; other γ-ray spectroscopy; Nickel base alloys; PAC; Physics; Quadrupole interaction; Solid solutions; PAC; Intermetallics; Hyperfine interactions; Ni; 76.60.Jx; 76.80.+y; Hf; Nickel base alloys; Hafnium alloys; Intermetallic compounds; Quadrupole interactions; Larmor precession; Dipole interactions; Internal oxidation; Defects; Perturbed angular correlation; Solid solutions; Ferromagnetism; Transition element alloys
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2008.09.184

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.