Perturbed-angular-correlation study of the electric-field gradient in {sup 181}Hf-doped and implanted indium sesquioxide

Journal Article · Sun Jun 01 04:00:00 EDT 1997 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.55.14200· OSTI ID:509040

Renteria, M; Requejo, F G; Bibiloni, A G; Pasquevich, A F; Shitu, J ^[1]; Freitag, K ^[2]

---

1. Departamento de Fisica, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, CC N67, 1900 La Plata (Argentina)
2. Institut fuer Strahlen- und Kernphysik der Universitaet Bonn, Nussallee 14-16, 5300 Bonn (Germany)

We studied the hyperfine interactions of {sup 181}Ta in In{sub 2}O{sub 3} by means of perturbed-angular-correlation (PAC) measurements. We prepared thin films of indium sesquioxide with different degrees of initial amorphism and implanted them with {sup 181}Hf. Chemically prepared indium-sesquioxide powder samples were also made starting from neutron-irradiated HfCl{sub 4}, which provides the {sup 181}Hf PAC probes. PAC experiments were performed on each sample at room temperature, after each step of annealing programs at increasing temperatures up to the full crystallization of the samples. The results indicate that the PAC probe occupies preferentially the axially symmetric cation site. Point-charge-model calculations were performed. The calculated asymmetry parameters {eta} were compared with those obtained in {sup 181}Hf PAC experiments performed also on other binary oxides, showing that the symmetry of the electric-field-gradient (EFG) tensor at {sup 181}Ta cation sites in binary oxides is mainly determined by the nearest-neighbor oxygen-ion distribution around the probe. Comparisons of the experimental results in bixbyites obtained for both PAC probes, {sup 111}Cd and {sup 181}Ta, show that the local EFG in bixbyites, are strongly dependent on the geometry of the sites and the electronic configuration of the probes. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 509040
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 21 Vol. 55; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
66 PHYSICS
ANNEALING
CRYSTAL DOPING
CRYSTAL LATTICES
ELECTRIC FIELDS
ELECTRONIC STRUCTURE
HAFNIUM
HAFNIUM 181
HYPERFINE STRUCTURE
IMPURITIES
INDIUM COMPOUNDS
INDIUM OXIDES
ION IMPLANTATION
PERTURBED ANGULAR CORRELATION
TANTALUM
TANTALUM 181
THIN FILMS