Structural variations of ScRh3Bx (x = 0-1) phase studied by transmission electron microscopy

Kunio Yubuta, Akiko Nomura, Kazuo Nakajima, Toetsu Shishido

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

We have examined structural ordering of a Cu3Au-type compound ScRh3Bx (x = 0-1) by electron diffraction and high-resolution transmission electron microscopy (HRTEM). The electron diffraction patterns reveal 1/2 1/2 1/2-type superlattice reflections in a B content range of 0.5 ≤ x ≤ 0.75, where an anomalous drop of hardness was observed. This behavior is quite similar in a CeRh3Bx phase. Conclusively, ordering of B atoms in Rh-octahedra followed by the appearance of the long-ranged modulated structure could lead to the anomalous behavior of hardness in ScRh3Bx. The observed HRTEM image of ScRh3B0.5 and ScRh3B0.75 taken with a diffraction pattern showing the superlattice reflections along the [0 1 1] direction shows a domain structure. The superlattice is due to vacancy ordering.

Original languageEnglish
Pages (from-to)341-346
Number of pages6
JournalJournal of Alloys and Compounds
Volume471
Issue number1-2
DOIs
Publication statusPublished - 2009 Mar 5

Keywords

  • Boron nonstoichiometry
  • Crystal structure
  • Electron diffraction
  • Hardness
  • Superlattice reflection

ASJC Scopus subject areas

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

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