Abstract
The salient features of the boron-germanium phase equilibrium diagram have been 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 monotectic-eutectic 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.The germanium-rich liquid freezes as essentially pure germanium; the solid solubilities of germanium in boron and of boron in germanium are virtually nil at the eutectic temperature. The minute quantity of boron that does dissolve in solid germanium does so substitutionally with a 0.01–0.02 vol.% 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.
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