Measurement and correlation of optical and TEM (Transmission Electron Microscopy) twins in Y sub 1 Ba sub 2 Cu sub 3 O sub 7-. delta
The spacing of the twins present in Y{sub 1}Ba{sub 2}Cu{sub 3}O{sub 7-{delta}} has been investigated using optical and Transmission Electron Microscopy (TEM). Studies have reported that the value of the average twin spacing obtained by optical measurements is much larger than that measured in thin foils prepared for TEM observation, and controversy exists as to the exact nature of the optical twins. Experiments have been conducted which show that the twins observed optically correspond to those seen using TEM and are not produced by an optical interference effect. Using electron channeling, equations have been formulated which allow optical determination of the true spacing of twins present in a selected grain as well as the orientation of that grain. The average twin spacing measured in TEM has been found to vary with sample preparation method, being smaller for crushed chip samples that for bulk samples prepared by ion milling or jet-polishing. A variation of the twin spacing with grain size has also been noted. 12 refs., 6 figs., 2 tabs.
- Research Organization:
- Ames Lab., Ames, IA (United States)
- Sponsoring Organization:
- DOE/ER
- DOE Contract Number:
- W-7405-ENG-82
- OSTI ID:
- 6623991
- Report Number(s):
- IS-M-626; CONF-880812-47; ON: DE90016705
- Resource Relation:
- Conference: Applied superconductivity conference, San Francisco, CA (USA), 21-25 Aug 1988
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BARIUM OXIDES
MICROSTRUCTURE
COPPER OXIDES
YTTRIUM OXIDES
ELECTRON CHANNELING
GRAIN SIZE
HIGH-TC SUPERCONDUCTORS
TRANSMISSION ELECTRON MICROSCOPY
TWINNING
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CHALCOGENIDES
CHANNELING
COPPER COMPOUNDS
CRYSTAL STRUCTURE
ELECTRON MICROSCOPY
MICROSCOPY
OXIDES
OXYGEN COMPOUNDS
SIZE
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
360202* - Ceramics
Cermets
& Refractories- Structure & Phase Studies