(Al,Mg)3La: a new phase in the Mg–Al–La system

Charlotte Wong, Mark J. Styles, Suming Zhu, Dong Qiu, Stuart D. McDonald, Yuman Zhu, Mark A. Gibson, Trevor B. Abbott, Mark A. Easton

Research output: Contribution to journalArticleResearchpeer-review

6 Citations (Scopus)

Abstract

During an investigation of the Mg-rich end of the Mg–Al–La system, a new ternary phase with the composition of (Al,Mg)3La was identified. The crystal structure of this phase was determined by conventional X-ray powder diffraction and transmission electron microscopy analysis and refined using high-resolution X-ray powder diffraction. The (Al,Mg)3La phase is found to have an orthorhombic structure with a space group of C2221 and lattice parameters of a = 4.3365 (1) Å, b = 18.8674 (4) Å and c = 4.4242 (1) Å, which is distinctly different from the binary Al3La phase (P63/mmc). The resolved structure of the (Al,Mg)3La phase is further verified by high-angle annular dark-field scanning transmission electron microscopy.

Original languageEnglish
Pages (from-to)370-375
Number of pages6
JournalActa Crystallographica Section B: Structural Science, Crystal Engineering and Materials
Volume74
Issue number4
DOIs
Publication statusPublished - 1 Aug 2018

Keywords

  • (Al,Mg)La phase
  • high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) imaging
  • Rietveld refinement
  • simulated annealing
  • synchrotron powder diffraction

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