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Semiconducting Materials: Part 2 AnInvestigation of the Boron-Phosphorous System
NEW YORK STATE COLL OF CERAMICS ALFRED
Hot-pressing of BP was used to prepare polycrystal line samples in the boron-phosphorous system. Hotpressed samples containing up to 24 carbon were also prepared and their properties analyzed. A study of the effect of hot- pressing variables on composition and properties was made. A comprehensive analysis was made of compounds, phases, compositions, grain size, and impurity content. A series of compositions, including pure B13P2, was examined for Knoop hardness, electrical conductivity, activation energies, thermal conductivity, thermoelectric power, density, Hall effect, and magnetoresistance. The value of hot-pressed samples in the boron-phosphorouscarbon system for thermoelectric applications was measured and reviewed. The electrical conductivity in B13P2 was measured and a mechanism for conduction based on extrinsic levels and a surface effect is proposed. A theoretical model for understanding the physical aspects of this system is presented. Sufficient evidence of the existence of B10P was obtained to warrant further study. A correlation between composition and physical properties was established.
Final rept. Pt. 2
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