A STUDY OF SELECTED METALLIC BORIDES, NITRIDES, AND PHOSPHIDES
Abstract
Attempts were made to prepare the nitrides of Mo, Pd, Ta, V, an d Zr, and the borides of Mo, Ta, Th, V, and Zr. Mo sub5 N sub4 was not formed by reacting MoO sub3 with NH sub3 gas, with or without C. The reaction of MoCl sub2 with NH sub3 gas produced small amounts of Mo sub5 N sub4; heating Mo to 900 deg C in a stream of NH sub3 gas yielded a bulk sample of Mo sub5 N sub4 containing 88.5% Mo and 9.77% N. The double decomposition of Ca sub3 N sub2 and V su2 O sub5 yielded 88% VN. An appreciable quantity of VN was produced by the reaction involving metallic V and NH sub3 at 1600 deg F; however, separation of the hydride which was also produced was impractical. Heating of V sub2 O sub2 Cl sub4 in a stream of NH sub3 gas produced appreciable amounts of VN. The double decomposition of Ca sub3 N sub2 and ZrO sub2 or ZrCl sub4 and the reduction of ZrCl sub4 by NH sub3 were unsatisfactory methods for obtaining ZrN, A large sample of Zrn, 70% pure, was prepared by the use of Zr metal as a heating element in an NH sub3 gas-filled chamber. The work on Ta sub3 N sub5 and Pd nitride preparation was not sufficiently advanced to develop methods for preparing bulk samples. Fusion of elemental powders of Mo and B failed to yield Mo boride. TaC formed in the furnace reaction of Ta sub2 O sub5 and B in a graphite crucible. When Th and B were heated together in a graphite-helix resistance furnace, ThO sub2 predominated. X-ray diffraction patterns were used unsuccessfully to identify the compounds resulting from attempts to obtain V boride and Zr sub3 B sub4.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 30, 1952
- Accession Number
- AD0012451
Entities
People
- F. E. Ryerson
- G. C. Williams
- R. W. Morel
Organizations
- University of Louisville