Accession Number : ADA304287

Title :   Surface Properties of Transition Metal Carbides.

Descriptive Note : Final rept. 30 Sep 91-30 Sep 95,

Corporate Author : LINFIELD RESEARCH INST MCMINNVILLE OR

Personal Author(s) : Davis, Paul R.

PDF Url : ADA304287

Report Date : NOV 1995

Pagination or Media Count : 39

Abstract : Single crystal rods of ZrC and HfC were prepared by an arc float zone refinement technique. Single crystal specimens of compositions ZrC(0.92 + or - 0.04), ZrC(0.86 + or - 0.04) and ZrC(0.82 + or - 0.04) were fabricated for conductivity measurements and for surface studies. The electrical conductivities of ZrC(x) specimens have been measured at room temperature by a four-point probe method. The variation of resistivity with composition is discussed. Experiments were performed to study boron diffusion into ZrC specimens. Diffusion specimens and controls were analyzed by cold neutron depth profiling at the NIST cold neutron facility in Gaithersburg, MD, and by Auger depth profiling in our laboratory. jg p5

Descriptors :   *TRANSITION METALS, *HAFNIUM, *CARBIDES, *SURFACE PROPERTIES, *ZIRCONIUM, MEASUREMENT, PROBES, LOW TEMPERATURE, RESISTANCE, SINGLE CRYSTALS, ELECTRICAL CONDUCTIVITY, ROOM TEMPERATURE, VARIATIONS, SURFACES, PROFILES, DIFFUSION, RODS, BORON, AUGERS, NEUTRONS, METAL COMPOUNDS.

Subject Categories : Inorganic Chemistry
      Physical Chemistry
      Electricity and Magnetism
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE