EPR studies of some f/sup n/ and d/sup n/ electronic impurities in KTaO/sub 3/ single crystals

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

OSTI ID:6364700

Abraham, M M; Boatner, L A; Olson, D N; Hoechli, U T

Single crystals of the cubic perovskite host, potassium tantalate (KTaO/sub 3/), doped with iron group, lanthanide, and actinide impurities have been investigated using the technique of electron paramagnetic resonance (EPR). The EPR spectra of Yb/sup 3 +/ and U/sup 5 +/ have been observed for the first time in potassium tantalate by employing crystals co-doped with both impurities. Multiple doping of the material during the crystal growth process avoided the production of semiconducting KTaO/sub 3/ and resulted in the incorporation of adequate concentrations of the trivalents lanthanide ion Yb/sup 3 +/. The EPR results indicate that Yb/sup 3 +/ occupies a site in which the local symmetry is axial as a result of nearby charge compensation. Pentavalent uranium is found to occupy a substitutional cubic symmetry site. EPR investigations of Cu/sup 2 +/, Co/sup 2 +/, Mn/sup 2 +/, Ni/sup 3 +/, and Fe/sup 3 +/ were also carried out.

• Research Organization: Oak Ridge National Lab., TN
• DOE Contract Number: W-7405-ENG-26
• OSTI ID: 6364700
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 81:6; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALKALI METAL COMPOUNDS
CHALCOGENIDES
CRYSTAL DOPING
CRYSTAL STRUCTURE
ELECTRON SPIN RESONANCE
IMPURITIES
MAGNETIC RESONANCE
OXIDES
OXYGEN COMPOUNDS
POTASSIUM COMPOUNDS
REFRACTORY METAL COMPOUNDS
RESONANCE
TANTALATES
TANTALUM COMPOUNDS
TANTALUM OXIDES
TRANSITION ELEMENT COMPOUNDS