Accession Number : AD0656335

Title :   THE STRUCTURE OF THE M'-PHASE OF YTAO4, A THIRD FERGUSONITE POLYMORPH,

Corporate Author : AEROSPACE CORP EL SEGUNDO CALIF LABS DIV

Personal Author(s) : Wolten,Gerard M.

Report Date : FEB 1967

Pagination or Media Count : 25

Abstract : The M' -phase of fergusonite is closely related to the other known monoclinic form (M-phase), except that it has a halved b-axis and its space group is P2/a instead of I2. The structure of the M' -phase was determined for YTaO4 from three-dimensional diffractometer data, and its relationship to the other polymorphs is discussed. The lattice parameters of M' -YTaO are: a = 5.292A, b = 5.451A, c = 5.110A, beta = 96.44 deg., Z = 2. (Author)

Descriptors :   (*YTTRIUM COMPOUNDS, *CRYSTAL STRUCTURE), (*TANTALUM COMPOUNDS, CRYSTAL STRUCTURE), PHASE STUDIES, MINERALS, X RAY DIFFRACTION, OXIDES

Subject Categories : Geology, Geochemistry and Mineralogy
      Ceramics, Refractories and Glass
      Crystallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE