EPR investigations of Fe/sup 3 +/ in single crystals and powders of the zircon-structure orthophosphates LuPO/sub 4/, YPO/sub 4/, and ScPO/sub 4/

Journal Article · Fri Jan 01 04:00:00 EST 1982 · J. Chem. Phys.; (United States)

OSTI ID:5770747

Rappaz, M; Ramey, J O; Boatner, L A; Abraham, M M

Iron-doped single crystals of the zircon-structure orthophosphates LuPO/sub 4/, YPO/sub 4/, and ScPO/sub 4/ have been grown by means of a flux technique. Corresponding powders have been prepared independently by a urea precipitation technique and electron paramagnetic resonance measurements demonstrate that the Fe/sup 3 +/ impurity is situated in the same substitutional site in both the single crystals and the powders for all three hosts. The sign of the crystal field parameter b/sup 0//sub 2/ is shown to be positive (opposite to that found for Gd/sup 3 +/ in these hosts). The crystal-field splittings were found to be largest for the scandium host and smallest for the yttrium host. The EPR results show that iron can be incorporated in a substitutional crystallographic site in material prepared by either a high temperature process or by a low temperature precipitation and calcination (approx.800 /sup 0/C), and these findings have implications for the use of lanthanide and related orthophosphates as a host material for the isolation of nuclear wastes.

• Research Organization: Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830
• OSTI ID: 5770747
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 76:1; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

052000 -- Nuclear Fuels-- Waste Management
12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
36 MATERIALS SCIENCE
360603* -- Materials-- Properties
CHARGED PARTICLES
CRYSTAL FIELD
CRYSTALS
DOPED MATERIALS
ELECTRON SPIN RESONANCE
FEASIBILITY STUDIES
IONS
IRON IONS
LUTETIUM COMPOUNDS
LUTETIUM PHOSPHATES
MAGNETIC RESONANCE
MANAGEMENT
MATERIALS
MONOCRYSTALS
OXYGEN COMPOUNDS
PHOSPHATES
PHOSPHORUS COMPOUNDS
POWDERS
RADIOACTIVE MATERIALS
RADIOACTIVE WASTE DISPOSAL
RADIOACTIVE WASTES
RARE EARTH COMPOUNDS
RESONANCE
SCANDIUM COMPOUNDS
SCANDIUM PHOSPHATES
TRANSITION ELEMENT COMPOUNDS
WASTE DISPOSAL
WASTE MANAGEMENT
WASTES
YTTERBIUM COMPOUNDS
YTTERBIUM PHOSPHATES