Accession Number:

AD0744980

Title:

Preparation and Properties of Rare-Earth Compounds

Descriptive Note:

Semiannual technical rept. 4 Jan-3 Jun 1972

Corporate Author:

BATTELLE COLUMBUS DIV OH

Personal Author(s):

• Wood, Van E.
• Brog, Kenneth C.
• Austin, Alfred E.
• Miller, James F.
• Jones, Jr, William H.

Report Date:

1972-06-30

Pagination or Media Count:

54.0

Abstract:

The preparation and characterization and certain physical properties of some rare-earth compounds of technological potential are described. Magneto- ferroelectric materials and narrow-band narrow-gap semiconductors were investigated. In the former area, development of a simultaneously ferroelectric and ferromagnetic device element operating in a useful temperature range is the primary goal. The principal materials studied were bismuth-neodymium ferrites. It was found that addition of neodymium led to weak ferromagnetism at room temperature in the ferroelectric BiFeO3 phase. A nuclear-magnetic-resonance study of certain samarium monochalcogenides, which undergo semiconductor-to- metal transitions at elevated pressure, was carried out in order to determine the degree of localization of the samarium 4f states in these materials. Experiments on cathodoluminescence in these materials and further investigations of allegedly ferroelectric ytterbium chromite are also reported briefly.

Descriptors:

• *SEMICONDUCTORS
• *RARE EARTH COMPOUNDS
• MAGNETIC PROPERTIES
• CRYSTAL STRUCTURE
• NUCLEAR MAGNETIC RESONANCE
• FERROELECTRIC MATERIALS
• CRYSTAL GROWTH
• FERRITES
• BISMUTH COMPOUNDS
• SCIENTIFIC RESEARCH
• MANGANATES
• YTTERBIUM COMPOUNDS
• SAMARIUM COMPOUNDS
• NEODYMIUM COMPOUNDS
• SELENIDES
• SULFIDES
• SOLID SOLUTIONS
• LUMINESCENCE
• DOPING
• SYNTHESIS(CHEMISTRY)
• CHROMATES

Subject Categories:

• Solid State Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE