Crystallographic site of Mn in the icosahedral cluster of LaCo13-xMnx compounds

K. Asada, K. Konno, M. Matsuura, M. Sakurai, A. Fujita, K. Fukamichi

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Studies on the structure and the crystallographic site of Mn in LaCo13-xMnx compounds were carried out by using X-ray diffraction and X-ray absorption fine structure (XAFS) of the Mn K-edge. These compounds with x≤3.0 adopt a NaZn13-type structure consisting of icosahedral clusters. The lattice constant increases with the Mn concentration. The calculated XAFS curves of the center and the corner sites in the icosahedral clusters for the Mn K-edge are obtained by using the program FEFF. The fitting result for the corner site agrees much better with the observed XAFS spectrum than that for the center site. Therefore, the Mn site is determined to be the corner Co site in the icosahedral clusters of all the compounds. In comparison with the crystallographic parameters of LaCo13, the icosahedral clusters composed of Mn atoms expand and the crystallographic Mn site is slightly more close to the La atom.

Original languageEnglish
Pages (from-to)47-51
Number of pages5
JournalJournal of Alloys and Compounds
Volume350
Issue number1-2
DOIs
Publication statusPublished - 2003 Feb 17

Keywords

  • Crystal structure
  • Magnetic measurements
  • Rare earth compounds
  • Transition metal compounds
  • X-ray spectroscopy

ASJC Scopus subject areas

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

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