Time differential perturbed angular correlation studies of hafnium hydrides |
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Authors: | Z Berant Y Levitin Sylvian Kahane A Wolf M H Mintz |
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Institution: | (1) Department of Physics, Nuclear Research Center, Negev, P.O.B. 9001, Beer Sheva, Israel |
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Abstract: | The dependence of the electric field gradients (EFG) in Hafnium-Hydride systems as a function of the composition H/Hf in the
cubic δ and tetragonal ε phases were investigated using the time-dependent perturbed angular correlation (TDPAC) technique,
with181Ta as the nuclear probe. Two EFGs were found in the ε phase, indicating the existence of two major symmetries surrounding
the Ta probe. The results indicate that the trend of the EFGs, in the ε phase, are due to the changes in the lattice parametersa
o,c
o as hydrogen is added to the Hf-H system. In the δ phase, only one major symmetry was found. Both phases are characterized
by broad frequency distributions and large anisotropies. |
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Keywords: | |
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