Perturbed angular correlation study of impurity interactions in a cubic host metal: Hf in Nb
- Department of Physics and Advanced Materials Research Center, Oregon State University, Corvallis, Oregon 97331 (US)
{sup 181}Ta perturbed angular correlation experiments have been performed on Nb-Hf alloys containing 0.5--5.5 at. % Hf. A Maxwellian frequency distribution model is proposed to account for the electric-field-gradient distribution due to impurities in a cubic matrix. The model was used to analyze the Nb-Hf data. If an unperturbed fraction is included with the Maxwellian distribution, then agreement with experiment is excellent. The unperturbed site is apparently required to correct for underestimation of the actual distribution by the Maxwellian at low frequencies. The unperturbed fraction is large only for small impurity concentrations and corresponds approximately to sites more distant than five lattice spacings from the nearest impurity. The peak of the Maxwellian quadrupole frequency distribution is linear in Hf concentration.
- OSTI ID:
- 5525736
- Journal Information:
- Physical Review (Section) B: Condensed Matter; (USA), Vol. 40:7; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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