THE STRUCTURE OF DIMOLYBDENUM CARBIDE BY NEUTRON DIFFRACTION TECHNIQUE,

Abstract

It is generally believed that Mo2C has either the hexagonal C6 Cadmium iodide anti-type structure or the related hexagonal L'3 structure. A neutron diffraction study showed that this is not the case. Mo2C crystallizes with an orthorhombic unit cell with a = 4.72 sub 4A, b = 6.00 sub 4A, and c = 5.19 sub 9A. The atomic arrangement of Mo2C presents a new structure type. Space group is D(14)2h - Pbcn. Eight molybdenum atoms are in 8d) with x = 1/4, y = 1/8, z = 1/12 and four carbon atoms are in 4c) with y = 3/8. The carbon atoms in Mo2C arrange themselves in such a way, that each molybdenum atom has three nearly planar carbon neighbours. (Author)

Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1962
Accession Number
AD0611197

Entities

People

  • Edwin Parthe
  • Varadachari Sadagopan

Organizations

  • University of Pennsylvania

Tags

DTIC Thesaurus Topics

  • Cooperation
  • Diffraction
  • Massachusetts
  • Molybdenum
  • Neutron Diffraction
  • Wave Phenomena

Fields of Study

  • Chemistry

Readers

  • Joint Military Operations and Doctrine.
  • Materials Science and Engineering.

Technology Areas

  • Space