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 language | English |
|---|---|
| Pages (from-to) | 2857-2865 |
| Number of pages | 9 |
| Journal | Acta Materialia |
| Volume | 54 |
| Issue number | 10 |
| DOIs | |
| Publication status | Published - 2006 Jun 1 |
| Externally published | Yes |
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