Occurrence and stability of trivalent zirconium in orthophosphate single crystals

Journal Article · Sat Dec 15 04:00:00 EST 1984 · J. Chem. Phys.; (United States)

DOI:https://doi.org/10.1063/1.447678· OSTI ID:6017061

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

EPR spectroscopy has been used in investigations of the unusual 3+ valence state of zirconium. The EPR spectrum of Zr/sup 3 +/, which was initially observed as a parasitic signal in Fe-doped single crystals of ScPO/sub 4/, was definitively identified by preparing single crystals of ScPO/sub 4/ doped with isotopically enriched (94.6%)/sup 91/Zr. Single crystals of LuPO/sub 4/ and YPO/sub 4/ doped with both naturally abundant and isotopically enriched Zr were also grown and investigated. The EPR spectrum of Zr/sup 3 +/ could be observed at room temperature in the ''as-grown'' single crystals of both ScPO/sub 4/ and LuPO/sub 4/; and, accordingly, the 3+ state is stable at room temperature in these hosts. The spectrum of Zr/sup 3 +/ in the YPO/sub 4/ host could only be observed following a ..gamma.. irradiation at 77 K, and this spectrum decayed rapidly with increasing temperature. Axial spin-Hamiltonian parameters were determined for Zr/sup 3 +/ in all three hosts at a sample temperature of 77 K and at room temperature for the ScPO/sub 4/ and LuPO/sub 4/ hosts. In the case of the latter two hosts, the spin-Hamiltonian parameters were found to exhibit a small temperature dependence. The observed g values were not accounted for by previously published second-order expressions indicating that additional coupling mechanisms are operative.

• Research Organization: Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831
• OSTI ID: 6017061
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 81:12; 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
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ACTINIDE COMPOUNDS
ALLOYS
CATIONS
CHARGED PARTICLES
CHEMICAL RADIATION EFFECTS
CHEMICAL REACTIONS
CHEMICAL STATE
CHEMISTRY
CRYSTALS
DECOMPOSITION
DOPED MATERIALS
ELECTROMAGNETIC RADIATION
ELECTRON SPIN RESONANCE
GAMMA RADIATION
IONIZING RADIATIONS
IONS
LUTETIUM COMPOUNDS
LUTETIUM PHOSPHATES
MAGNETIC RESONANCE
MANAGEMENT
MATERIALS
MINERALS
MONAZITES
MONOCRYSTALS
OXYGEN COMPOUNDS
PHOSPHATES
PHOSPHORUS COMPOUNDS
RADIATION CHEMISTRY
RADIATION EFFECTS
RADIATIONS
RADIOACTIVE MATERIALS
RADIOACTIVE MINERALS
RADIOACTIVE WASTE DISPOSAL
RADIOLYSIS
RARE EARTH COMPOUNDS
RESONANCE
SCANDIUM COMPOUNDS
SCANDIUM PHOSPHATES
STABILITY
THORIUM COMPOUNDS
THORIUM MINERALS
THORIUM PHOSPHATES
TRANSITION ELEMENT COMPOUNDS
VALENCE
WASTE DISPOSAL
WASTE MANAGEMENT
YTTRIUM COMPOUNDS
YTTRIUM PHOSPHATES
ZIRCONIUM ADDITIONS
ZIRCONIUM ALLOYS
ZIRCONIUM COMPOUNDS
ZIRCONIUM PHOSPHATES