Accession Number : AD0438516

Title :   GROWTH AND CHARACTERIZATION OF SINGLE CRYSTALS OF RARE EARTH COMPOUNDS.

Descriptive Note : Quarterly technical rept. no. 3.

Corporate Author : WESTINGHOUSE ELECTRIC CORP PITTSBURGH PA

Report Date : 1944

Pagination or Media Count : 12

Abstract : Single crystalline films of EuS, having either (100) or (111) orientation, were prepared by vapor-deposition techniques. Three alkali halides, NaCl, NaBr, and CaF2 were found satisfactory as substrate materials for the epitaxial growth of EuS. A simple mode of epitaxy was observed for both the (100) and (111) cleavage surfaces. The conditions for the deposition and the quality of the films were critically examined. Some striking effects were noted of the doping of La on the electrical conduction of EuS. In addition to a marked decrease in resistivity at all temperatures between 4.2 and 300, La substitution also causes a slight incr ase of the Curie temperature. Ferromagnetic EuS with La as little as 1% exhibit metallic behavior in the electrical conduction below the Curie temperature. In all doped compounds, the resistivities drop by several orders of magnitude accompanying the paramagnetic approaches ferromagnetic transition. (Author)

Descriptors :   (*SINGLE CRYSTALS, EUROPIUM COMPOUNDS), (*EUROPIUM COMPOUNDS, CRYSTAL GROWTH), (*CRYSTAL GROWTH, SINGLE CRYSTALS), CRYSTAL STRUCTURE, CRYSTAL LATTICES, EPITAXIAL GROWTH, SULFIDES, SODIUM COMPOUNDS, CHLORIDES, BROMIDES, CALCIUM COMPOUNDS, FLUORIDES, IMPURITIES, LANTHANUM, TRANSITION TEMPERATURE, FERROMAGNETISM, ELECTRICAL CONDUCTIVITY, PARAMAGNETIC PROPERTIES, SOLID SOLUTIONS, CHROMIUM ALLOYS, TELLURIUM ALLOYS, CRYSTAL DEFECTS, RESISTANCE (ELECTRICAL), MOLECULAR STRUCTURE, THORIUM COMPOUNDS, PHOSPHIDES, LABORATORY FURNACES, ELECTRON IRRADIATION, TERBIUM ALLOYS, YTTRIUM ALLOYS, ZONE MELTING

Distribution Statement : APPROVED FOR PUBLIC RELEASE