Perturbed angular correlation studies of 181Ta hyperfine interactions in Hf–Ni and Zr–Ni compounds
作者:P.R.J. Silva、H. Saitovitch、J.T. Cavalcante、M. Forker
DOI:10.1016/j.jmmm.2009.12.037
日期:2010.7
The hyperfine interaction experienced by Ta-181 nuclei in the intermetallic compounds ZrNi5, HfNi5, and Hf2Ni7 has been investigated by perturbed angular correlation (PAC) spectroscopy. At temperatures T >= 15 K the Ta-181 angular correlation of appropriately annealed ZrNi5 and HfNi5 is unperturbed, indicating the absence of a magnetic hyperfine interaction. This observation rules out the possibility of spontaneous magnetic order of ZrNi5 and HfNi5 recently proposed in the literature. The temperature dependence of the electric quadrupole interaction of Ta-181 in Hf2Ni7 suggests the existence of a reversible phase transformation at T >= 500 K. (C) 2009 Elsevier B. V. All rights reserved.