The Compatibilities of Boron and Germanium.
Abstract
The salient features of the boron-germanium phase equilibrium diagram were deduced from X-ray diffraction, metallographic, thermal analysis, and electron microprobe studies on both sintered and melted alloys. The system can be characterized as a classical monotecticeutectic with no intermediate phases. The occurrence of hypomonotectic boron crystals and boron crystals grown from a germanium melt indicates a slight solubility of germanium in solid boron and of boron in liquid germanium at the monotectic temperature. X-ray diffraction, thermal analysis, and metallographic studies indicate that the germanium-rich liquid freezes as essentially pure germanium and that the solid solubility of germanium in boron and of boron in germanium is virtually nil at the eutectic temperature. The minute quantity of boron that does dissolve in solid germanium does so substitutionally with a 0.01 to 0.02 volume percent contraction of the germanium lattice. These results indicate that germanium may have utility as a boron diffusion barrier for boron fiber-reinforced metal-matrix composites. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1969
- Accession Number
- AD0863815
Entities
People
- Lawrence R. Bidwell
Organizations
- Air Force Research Laboratory