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Site preference of Hf dopant in Ni3Al alloys: A perturbed angular correlation study

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Authors
Ivanovski, Valentin N.
Cekić, Božidar Đ.
Umićević, Ana
Barudžija, Tanja
Schumacher, G.
Mađarević, Ivan
Koteski, Vasil J.
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Abstract
Perturbed angular correlation measurements of the hyperfine interactions of the Ta-181 probe in the polycrystalline intermetallic Ni3Al doped with 0.5 and 5 at.% Hf were performed in the temperature range 78-1230 K. The observed local hyperfine fields at the Hf-181/Ta-181 probe showed that Hf atoms are substituting on Al sites in the L1(2) structure of Ni3Al. The two minor electric quadrupole interactions that were found for each Ni3Al alloy are discussed taking into account the L1(2) cubic structure and its two tetragonal distortions: D0(22) and L6(0). The presence of two tetragonal transformations of the parent cubic L1(2) lattice in 0.5 at.% Hf and 5 at.% Hf doped Ni3Al was revealed by X-ray diffraction. The ab initio calculations, performed with the projector augmented wave method correctly reproduce the experimental results and enable discussion on the structural and electronic properties of the polycrystalline alloys. The experimental and theoretical investigations showed that ha...fnium additions prefer aluminum sites in Ni3Al. (C) 2014 Elsevier B.V. All rights reserved.

Keywords:
Intermetallics / Electronic properties / Perturbed angular correlations / PAC / X-ray diffraction
Source:
Journal of Alloys and Compounds, 2015, 622, 541-547
Projects:
  • Investigation of intermetallics and semiconductors and possible application in renewable energy sources (RS-171001)

DOI: 10.1016/j.jallcom.2014.10.132

ISSN: 0925-8388 (print); 1873-4669 (electronic)

WoS: 000345749500082

Scopus: 2-s2.0-84910648884
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http://vinar.vin.bg.ac.rs/handle/123456789/249
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