Formation of a series of chimney-ladder compounds in the Ru-Re-Si system

B. A. Simkin, A. Ishida, N. L. Okamoto, K. Kishida, K. Tanaka, H. Inui

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Rhenium-alloyed ruthenium sesquisilicide alloys have been prepared over the wide composition range Ru1-δReδSi1.5, 0 {less-than or slanted equal to} δ {less-than or slanted equal to} 0.85. The phase relationships of these alloys have been investigated using X-ray powder diffraction, scanning electron microscopy and transmission electron microscopy. Alloys with δ {greater than or slanted equal to} 0.03 are multi-phase, composed of a series of (Ru,Re)Siy chimney-ladder phases with compositions of Ru1-xRexSi1.5386+0.1783x (0.14 {less-than or slanted equal to} x {less-than or slanted equal to} 0.76) and B20-type monosilicide (Ru,Re)Si as a secondary phase. These chimney-ladder structures are considered to form to stabilize the high-temperature Ru2Si3 chimney-ladder phase through the substitution of Ru with Re. The solubility limit of Re in a series of chimney-ladder phases is as large as 76% Re (x = 0.76) and the Si/(Ru + Re) ratio of the chimney-ladder phases increases with increasing Re content. The observed deviation of the chimney-ladder structure from the idealized composition and the possibility of adjusting the semiconducting properties of these chimney-ladder structures are discussed in terms of the valence electron concentration per metal atom.

Original languageEnglish
Pages (from-to)2857-2865
Number of pages9
JournalActa Materialia
Volume54
Issue number10
DOIs
Publication statusPublished - 2006 Jun 1
Externally publishedYes

Keywords

  • Crystal structure
  • Electron diffraction
  • Semiconductor compounds
  • Transition metal silicides
  • Transmission electron microscopy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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