PAC spectroscopy of electronic ceramics

Technical Report · Tue Jan 01 00:00:00 EST 1991

DOI:https://doi.org/10.2172/5236444· OSTI ID:5236444

Gardner, J A; Wang, Ruiping; Schwenker, R ^[1]; Evenson, W E ^[2]; Rasera, R L ^[3]; Sommers, J A ^[4]

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1. Oregon Univ., Eugene, OR (United States). Dept. of Physics
2. Brigham Young Univ., Provo, UT (United States). Dept. of Physics and Astronomy
3. Maryland Univ., Catonsville, MD (United States). Dept. of Physics
4. Teledyne-Wah Chang, Albany, OR (United States)

Dilute indium dopants in cerium oxides and YBa{sub 2}Cu{sub 3}O{sub x} have been studied by{sup 111}In/Cd Perturbed Angular Correlation (PAC) spectroscopy. By controlling oxygen vacancy concentration in the cerium oxides through doping or high-temperature vacuum annealing, we have found that indium always forms a defect complex unless the sample is doped to reduce greatly the oxygen vacancy concentration. Three different vacancy-associated complexes are found with concentrations that depend on doping and oxygen stoichiometry. Another defect complex occurs in samples having negligible vacancy concentration. At low temperatures, evidence is found of interaction with an electronic hole trapped by {sup 111}Cd after the radioactive decay of the {sup 111}In parent. In YBa{sub 2}Cu{sub 3}O{sub x} the indium substitutes preferentially at the Y site but has measurable probability of substitution in at least one of the two copper sites. A symmetry change near 650 {degree}C is consistent with the well-documented orthorhombic/tetragonal transition for samples in air or oxygen.

• Research Organization: Oregon Univ., Eugene, OR (United States). Dept. of Physics
• Sponsoring Organization: USDOE; USDOE, Washington, DC (United States)
• DOE Contract Number: FG06-85ER45191
• OSTI ID: 5236444
• Report Number(s): DOE/ER/45191-19; ON: DE92014328
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BARIUM OXIDES
SPECTROSCOPY
COPPER OXIDES
YTTRIUM OXIDES
CADMIUM
CERIUM OXIDES
CRYSTAL DEFECTS
HIGH-TC SUPERCONDUCTORS
INDIUM 111
VACANCIES
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BETA DECAY RADIOISOTOPES
CERIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
CRYSTAL STRUCTURE
DAYS LIVING RADIOISOTOPES
ELECTRON CAPTURE RADIOISOTOPES
ELEMENTS
INDIUM ISOTOPES
INTERMEDIATE MASS NUCLEI
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
METALS
MINUTES LIVING RADIOISOTOPES
NUCLEI
ODD-EVEN NUCLEI
OXIDES
OXYGEN COMPOUNDS
POINT DEFECTS
RADIOISOTOPES
RARE EARTH COMPOUNDS
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
360202* - Ceramics
Cermets
& Refractories- Structure & Phase Studies
360204 - Ceramics
Cermets
& Refractories- Physical Properties
665411 - Basic Superconductivity Studies- (1992-)