Accession Number : AD0651342

Title :   EFFECT OF CHARGE COMPENSATION IN CALCIUM TUNGSTATE: YTTERBIUM,

Corporate Author : HARRY DIAMOND LABS WASHINGTON D C

Personal Author(s) : Nemarich,J. ; Viehmann,W.

Report Date : FEB 1967

Pagination or Media Count : 76

Abstract : The paramagnetic resonance spectra of CaWO4:Yb have been examined in single crystals grown from melts containing sodium, niobium, and no impurity for charge compensation. To varying extents all crystals showed the presence of Yb(3+) ions in sites with several types of local symmetry. In the sample gorwn from a melt containing a ratio of sodium to ytterbium of eight to one, approximately 71 percent of the Yb(3+) ions occupy sites with tetragonal symmetry. It is concluded that the structure observed in the optical spectra of this crystal may be due to Yb(3+) in lower symmetry sites. (Author)

Descriptors :   (*PARAMAGNETIC RESONANCE, *RARE EARTH ELEMENTS), YTTERBIUM, SINGLE CRYSTALS, SODIUM, NIOBIUM, SYMMETRY(CRYSTALLOGRAPHY), IONS, CRYSTAL STRUCTURE, CALCIUM COMPOUNDS, TUNGSTEN COMPOUNDS

Subject Categories : Inorganic Chemistry
      Crystallography
      Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE