Accession Number : ADA310878

Title :   Substitution in Ce2TSi3 Intermetallic Compositions with T = (Cr, Mn, Fe, Co, or Ni) x (Pd or Au) 1-x.

Descriptive Note : Technical rept. no. 30,

Corporate Author : CORNELL UNIV ITHACA NY DEPT OF CHEMISTRY

PDF Url : ADA310878

Report Date : 10 JUL 1996

Pagination or Media Count : 35

Abstract : Alloys of composition Ce2(3d/T)Si3, with '3d' one of Cr, Mn, Fe, Co or Ni and 'T' being Pd or Au, were separated and examined by powder x-ray diffraction. Select single phase compositions were further examined by magnetic susceptibility, by resistivity for the Pd and Co end-members and by specific heat for Ce2CoSi3. For compounds not containing cobalt, effective cerium moments consistent with trivalent cerium were observed. A re-examination of the AlB2 related structure of Ce2CoSi3 by single crystal methods revealed ordering of cobalt within the CoSi3 hexagonal layer. Magnetic susceptibility, resistance and specific heat measurements suggest valence fluctuation behavior of the cerium in Ce2CoSi3. A return to trivalent cerium magnetic behavior occurs on increasing palladium or gold substitution for cobalt.

Descriptors :   *INTERMETALLIC COMPOUNDS, *SUBSTITUTION REACTIONS, *CERIUM COMPOUNDS, MEASUREMENT, MAGNETIC PROPERTIES, POWDERS, RESISTANCE, X RAY DIFFRACTION, MOMENTS, SINGLE CRYSTALS, VARIATIONS, CHEMICAL COMPOSITION, IRON, SILICON, VALENCE, NICKEL, CHROMIUM, GOLD, PALLADIUM, SPECIFIC HEAT, COBALT, MANGANESE, CERIUM ALLOYS.

Subject Categories : Inorganic Chemistry
      Physical Chemistry
      Properties of Metals and Alloys
      Crystallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE