Accession Number : AD0613474

Title :   THE CRYSTAL STRUCTURE OF YB4,

Corporate Author : CARBORUNDUM CO NIAGARA FALLS N Y

Personal Author(s) : Giese,R. F. ,Jr. ; Matkovich,V. I. ; Economy,J.

Report Date : MAR 1965

Pagination or Media Count : 18

Abstract : A structure determination of YB4 was carried out in order to determine the boron positions in metal tetraborides. The structure proposed by earlier workers using the ThB4 was confirmed; however, significant departures in occupany of boron positions were noted. One boron position (B III) was found to be about 25% defective. As a consequence, each octahedral boron group is on the average one atom short. This argues against the earlier proposed structure interpretation based on a continuous framework of boron atoms. A new crystal chemical interpretation of the tetraboride structure is presented in terms of tetrahedral units which demonstrates a structural framework common to MB4, M3B2, and M2B type compounds. (Author)

Descriptors :   (*BORIDES, CRYSTAL STRUCTURE), (*YTTRIUM, BORIDES), X RAY DIFFRACTION, DENSITY, CRYSTAL DEFECTS

Distribution Statement : APPROVED FOR PUBLIC RELEASE