Oxygen self-diffusion coefficient in the superconductor YBa sub 2 Cu sub 3 O sub 7 minus. delta. from internal friction measurements

Journal Article · Mon Oct 15 04:00:00 EDT 1990 · Journal of Applied Physics; (USA)

DOI:https://doi.org/10.1063/1.346261· OSTI ID:6084907

Tallon, J L; Staines, M P ^[1]

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1. Physics and Engineering Laboratory, DSIR, Lower Hutt (New Zealand)

The internal friction of YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} is measured at 7.8, 40, and 144 kHz as a function of temperature (from 300 to 1100 K) and oxygen partial pressure. At 40 kHz a marked damping peak occurs at {similar to}800 K which is attributable to oxygen hopping in the basal plane. The oxygen diffusion coefficient calculated from the hopping relaxation time is in good agreement with other estimates yielding an activation enthalpy, {ital h}{sub {ital m}}=1.07{plus minus}0.05 eV and {ital D}{sub 0}=1.8{times}10{sup {minus}4} cm{sup 2}/s. At a critical value of {delta}{similar to}0.25 the diffusion coefficient begins to rise rapidly similar to the occurrence of a fast-ion transition.

• OSTI ID: 6084907
• Journal Information: Journal of Applied Physics; (USA), Journal Name: Journal of Applied Physics; (USA) Vol. 68:8; ISSN 0021-8979; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
DIFFUSION
ELEMENTS
FREQUENCY RANGE
FRICTION
HIGH TEMPERATURE
HIGH-TC SUPERCONDUCTORS
INTERNAL FRICTION
KHZ RANGE
KHZ RANGE 01-100
KHZ RANGE 100-1000
MEDIUM TEMPERATURE
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PARTIAL PRESSURE
SELF-DIFFUSION
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
VERY HIGH TEMPERATURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES