Accession Number:

AD0726201

Title:

Preparation and Properties of Rare-Earth Compounds

Descriptive Note:

Annual technical rept. 4 Jun 1970-4 Jun 1971

Corporate Author:

BATTELLE MEMORIAL INST COLUMBUS OH COLUMBUS LABS

Report Date:

1971-06-30

Pagination or Media Count:

123.0

Abstract:

Research on preparation of, characterization of, and physical- property measurements on rare-earth compounds of technological potential is described. Work was in four areas magnetoferroelectric materials, narrow-band narrow-gap semiconductors, rare-earth pnictides, and cooperative excitation of luminescence of rare-earth ions in insulators. In the first area, study of heavy rare-earth manganites and chromites and their solid solutions has been emphasized. Ranges of solid solution and weak ferromagnetism have been determined for Yb compounds. High pressure orthorhombic phases of Y, Ho and Yb manganites were shown to be antiferromagnetic. Work is in progress to determine the extent of ferroelectricity in all of the systems prepared. In narrow-band narrow-gap materials, it was attempted to determine the nature of a localized excited state in SmB6 in order to understand the conductivity transition. However, work on very well characterized SmB6 has thus far been inconclusive. Work on the pnictides was primarily on production of near-stoichiometric oxygen- free samples of DyN for magnetic resonance studies. Finally, studies on two- photon infrared-excited red fluorescence of Ho3 ions in CaF2 have established that at ion concentrations greater than about 0.5 the fluorescence arises from cooperative energy transfer between Ho3 ions rather than from successive excitation of a single ion.

Subject Categories:

  • Inorganic Chemistry
  • Electricity and Magnetism
  • Solid State Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE