Abrupt symmetry decrease in the ThT2Al20 alloys (T = 3D transition metal)

A. Uziel, A. I. Bram, A. Venkert, A. E. Kiv, D. Fuks, L. Meshi

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

Th-T-Al system, where T-3d transition metals, was studied at ThT2Al20 stoichiometry to establish the influence of T on the structural stability of ternary aluminide formed. Different alloys were prepared, varying T in the row from Ti to Fe. Using electron microscopy and X-ray diffraction methods it was found that ThT2Al20 phase adopts CeCr2Al20 structure type when T = Ti, V, and Cr. Starting from Mn, the symmetry of the stable Al-rich phase, which forms in the alloys with the same composition, decreases from cubic to orthorhombic. The results of Density Functional Theory (DFT) calculations coincide with experiments. Concepts of the Theory of Coordination Compounds and Jahn-Teller effect were used to explain the observed abrupt change of the symmetry. These considerations were supported by DFT calculations.

Original languageEnglish
Pages (from-to)353-359
Number of pages7
JournalJournal of Alloys and Compounds
Volume648
DOIs
StatePublished - 13 Jul 2015

Keywords

  • Aluminide
  • Crystal structure
  • DFT
  • Ternary alloys

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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