Accession Number : AD0639646

Title :   THE INVESTIGATION OF THE PREPARATION AND EVALUATION OF HIGH PURITY ELEMENTAL BORON.

Descriptive Note : Final rept., 1 Aug 63-31 Jul 66,

Corporate Author : EAGLE-PICHER INDUSTRIES INC MIAMI OKLA MIAMI RESEARCH LABS

Personal Author(s) : Buford,J. T.

Report Date : 31 AUG 1966

Pagination or Media Count : 78

Abstract : Ultrapure boron was produced via the boron triiodide intermediate. The BI3 was synthesized from crude elemental boron and C.P. grade iodine at various temperatures. A conversion efficiency of 56% was obtained using a charge of -4 +6 mesh boron at a temperature of 900-950C. Purification of the boron triiodide was performed by distillation in a 30 plate Oldershaw distillation apparatus, by batch zoning of the BI3 matrix, and by vacuum distillation. Thermal decomposition of the distilled BI3 produced boron with approximately 50 ppm carbon as the major impurity. The carbon impurity was measured by a gas chromatographic technique. Boron was crystallized for electrical measurements by vacuum zoning, using induction heating and by melting in a high pressure resistance heated furnace. Using this same high pressure equipment the synthesis of boron phosphide, boron arsenide and boron antimonide was studied. (Author)

Descriptors :   (*BORON, PURIFICATION), (*BORON COMPOUNDS, SYNTHESIS(CHEMISTRY)), SEMICONDUCTORS, MATERIALS, IODIDES, PREPARATION, DISTILLATION, VAPOR PLATING, ZONE MELTING, PYROLYSIS, GAS CHROMATOGRAPHY, IMPURITIES, ELECTRICAL PROPERTIES, CRYSTALLIZATION, PHOSPHIDES, ARSENIC ALLOYS, ANTIMONY ALLOYS

Subject Categories : Inorganic Chemistry
      Miscellaneous Materials
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE