Accession Number : AD0278246

Title :   FIELD EMISSION MICROSCOPY OF RE-MO ALLOYS AND STUDIES OF FIELD INDUCED SURFACE REACTIONS

Corporate Author : PENNSYLVANIA STATE UNIV UNIVERSITY PARK COLL OF CHEMISTRY AND PHYSICS

Personal Author(s) : MULLER,E.W.

Report Date : 31 MAR 1962

Pagination or Media Count : 1

Abstract : Field emission microscope patterns were obtained from 35 atom % Re-Mo alloy, showing a bcc lattice, and of more than 50 atom % alloy, showing sigma phase. A bcc phase twin crystal boundary was observed in a 112 plane, with (111) as the twinning direction. Adsorption of Zr and Th on the bcc phase and of O on the sigma phase was studied. Field ion microscopy of solute alloys gives no detailed results as field evaporation causes the development of atomically random surfaces. A fast scanning limited resolution mass spectrometer was developed which will be suitable for analyzing transient field desorption products. Double charged ions of W, Wo, and WO3 were observed. Field induced reactions between W, Mo or Pt with Co and N were observed to occur in a field ion microscope at fields up to 450 MV/cm and at temperatures down to 20 K, simultaneously with the rearrangement of metal atoms in the surface. (Author)

Descriptors :   ADSORPTION, CARBON COMPOUNDS, CHEMICAL REACTIONS, CRYSTAL LATTICES, CRYSTAL STRUCTURE, ELECTRIC FIELDS, ENERGY CONVERSION, MASS SPECTROSCOPY, MONOXIDES, NITROGEN, OXYGEN, PLATINUM, SURFACES

Distribution Statement : APPROVED FOR PUBLIC RELEASE