Accession Number : AD0651205

Title :   A REFINEMENT OF THE PARAMETERS OF ALPHA MANGANESE.

Descriptive Note : Technical rept.,

Corporate Author : ARMY MATERIALS RESEARCH AGENCY WATERTOWN MASS

Personal Author(s) : Gazzara,Charles P. ; Middleton,Raymond M. ; Weiss,R. J. ; Hall,E. O.

Report Date : MAR 1967

Pagination or Media Count : 15

Abstract : The atomic parameters of alpha manganese, first determined by Bradley and Thewlis (1927), have been refined from an R index of 0.093 to a final R of 0.029 for fifty reflections. This refinement was based on an analysis of the integrated intensities of X-ray diffracted powder peaks measured independently at two laboratories. The lattice constant of alpha manganese was determined from liquid helium temperature up to room temperature and a change in the thermal expansion coefficient was found in the vicinity of the Neel temperature (95 K) although no structural change was observed in this region. (Author)

Descriptors :   (*MANGANESE, *CRYSTAL STRUCTURE), X RAY DIFFRACTION, CRYOGENICS, LOW TEMPERATURE, EXPERIMENTAL DATA

Subject Categories : Crystallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE