STUDY OF SEMICONDUCTING PROPERTIES OF RARE-EARTH METALS AND COMPOUNDS
Abstract
Four binary crystalline phases of the Gd-Te system were identified: GdTe, a phase which persists over the Gd3Te4-Gd2Te3 range, GdTe2, and GdTe4. Two phases have been prepared and studied in the Nd-Te system: NdTe and a phase encompassing the Nd3Te4-Nd2Te3 composition range. In both the Gd-Te and Nd-Te systems, room temperature electrical resistivities and Seebeck coefficients typically increased as the Te-M ratio was increased from 1 to 1.33 to 1.5. Resistivities of all n-type specimens studied increased with temperature (80 to 800 K). Twelve new compositions, including selenides and tellurides of Sm, Yb, Ce, and Gd were prepared. Crystal structures and lattice constants obtained for 11 of the compounds show that generally the MX compositions have the NaCl structure and the M2X3 compositions have the bcc Th3P4-type structure. Trends in the electrical properties follow a pattern appearing to correlate with the M-X ratio and the stable valence states of the rare-earth elements. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 21, 1961
- Accession Number
- AD0262215
Entities
People
- J.f. Miller
- L.k. Matson
Organizations
- Battelle Memorial Institute