Crystal structure of the Th2Ni10Al15 phase solved using electron diffraction tomography

G. Yaniv, L. Meshi

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Due course of study of the Th-Ni-Al system, new Th2Ni10Al15 phase was revealed. Despite the prolonged heat treatment- the studied alloy did not attained equilibrium and contained many intermetallic phases along with the phase of an interest. Thus, structure solution of this phase was performed by only viable option - electron crystallography, specifically electron diffraction tomography. Such structures (containing actinides, transition metals and Al) were never solved before using this method. Since it is possible that Th, as heavy scatterer, will smear the Fourier map, making it hard to find the positions of the Al atoms - case study was performed prior structure solution of the Th2Ni10Al15 phase. Finally, it was determined that the Th2Ni10Al15 structure has an orthorhombic unit cell with following lattice parameters a = 3.99 Å, b = 11.18 Å, c = 17.34 Å and Immm (No.71) space group. Its structural model contains 54 atoms in the unit cell, distributed over 10 unique atom positions. This structure can be described both as stacking of coordination polyhedra formed around heavy atoms and as layered structure with unique architecture.

Original languageEnglish
Pages (from-to)496-502
Number of pages7
JournalJournal of Alloys and Compounds
Volume660
DOIs
StatePublished - 5 Mar 2016

Keywords

  • Electron diffraction tomography
  • Intermetallic
  • Layered structures
  • Precession electron diffraction
  • Structure solution
  • Th-Ni-Al

ASJC Scopus subject areas

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

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