Accession Number : AD0611197

Title :   THE STRUCTURE OF DIMOLYBDENUM CARBIDE BY NEUTRON DIFFRACTION TECHNIQUE,

Corporate Author : PENNSYLVANIA UNIV PHILADELPHIA SCHOOL OF METALLURGICAL ENGINEERING

Personal Author(s) : Parthe,Edwin ; Sadagopan,Varadachari

Report Date : 1962

Pagination or Media Count : 11

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)

Descriptors :   (*MOLYBDENUM COMPOUNDS, CARBIDES), (*CARBIDES, CRYSTAL SUBSTRUCTURE), (*NEUTRON DIFFRACTION, CARBIDES), PHASE STUDIES, POWDERS, MOLECULAR STRUCTURE, CRYSTAL LATTICES

Distribution Statement : APPROVED FOR PUBLIC RELEASE