Atmosphere-sensitive 225 K feature in internal friction of YBa2Cu3O7 - delta
Abstract
The Young's modulus and internal friction of YBa2 Cu3 O7-δ were measured from 280 to 80 K at 40 kHz using an ultrasonic composite oscillator technique. Three internal friction peaks intrinsic to the polycrystalline material which were observed at 105, 125, and 225 K disappeared when the sample was deoxygenated. Other structure in the internal friction between 220 and 280 K is ascribed to water vapor. The 225 K peak is reversibly eliminated on exposure to moist air. This is suggestive of internal friction at crystal surfaces or grain boundaries.
- Publication:
-
Applied Physics Letters
- Pub Date:
- October 1988
- DOI:
- Bibcode:
- 1988ApPhL..53.1560S
- Keywords:
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- Copper Oxides;
- High Temperature Superconductors;
- Internal Friction;
- Mixed Oxides;
- Modulus Of Elasticity;
- Barium Oxides;
- Polycrystals;
- Water Vapor;
- Yttrium Oxides;
- Solid-State Physics