Correlation of hydrogen diffusion with the relative concentrations of cubic and axial Fe/sup 3 +/ sites in KTaO/sub 3/

Journal Article · Sat Jan 15 04:00:00 EST 1983 · J. Chem. Phys.; (United States)

OSTI ID:6801619

Gonzalez, R; Abraham, M M; Boatner, L A; Chen, Y

Hydrogen in the form of OH/sup -/ ions has been incorporated into Fe-doped KTaO/sub 3/ single crystals by heat treatments in H/sub 2/O vapor, air, and hydrogen gas. Heat treatments in argon and oxygen resulted in a removal of OH/sup -/ from the crystal. The conditions resulting in the incorporation of OH/sup -/ also produced a decrease in the intensity of an axial Fe/sup 3 +/ EPR signal relative to the cubic site iron spectrum while the removal of OH/sup -/ was accompanied by a relative increase in the axial EPR signal. The removal of oxygen from Fe-doped KTaO/sub 3/ by heat treatments in potassium metal vapor was also found to elminate the axial Fe/sup 3 +/ EPR spectrum. These results do not support the previously accepted oxygen vacancy model for the Fe/sup 3 +/ axial site configuration and are contrary to the results of similar investigations of Fe/sup 3 +/ in SrTiO/sub 3/.

• Research Organization: Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830
• OSTI ID: 6801619
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 78:2; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
ALKALI METAL COMPOUNDS
ALLOYS
ATOM TRANSPORT
CHALCOGENIDES
CORRELATIONS
CRYSTALS
DIFFUSION
ELECTRON SPIN RESONANCE
ELEMENTS
HEAT TREATMENTS
HYDROGEN
IMPURITIES
IRON ADDITIONS
IRON ALLOYS
MAGNETIC RESONANCE
MONOCRYSTALS
NEUTRAL-PARTICLE TRANSPORT
NONMETALS
OXIDES
OXYGEN COMPOUNDS
POTASSIUM COMPOUNDS
POTASSIUM OXIDES
RADIATION TRANSPORT
RESONANCE
SYMMETRY
TANTALUM COMPOUNDS
TANTALUM OXIDES
TRANSITION ELEMENT COMPOUNDS