Local epitaxy of YBa{sub 2}Cu{sub 3}O{sub x} on polycrystalline Ni measured by x-ray microdiffraction.
Polychromatic synchrotron x-ray microdiffraction is used to determine the epitaxy of YBa{sub 2}Cu{sub 3}O{sub x} (YBCO) films grown on polycrystalline Y{sub .15}Zr{sub .85}O{sub 1.925}/CeO{sub 2}/Y{sub 2}O{sub 3}/Ni{sub 95}W{sub 5}(Ni) rolling-assisted, biaxially textured substrates (RABiTS). A novel analysis technique is introduced in which the orientation of mosaic films is measured by using a Hough transform to recognize arcs in Laue microdiffraction patterns that correspond to low-index zone axes. While the overall epitaxy is cube-on-cube, grain-by-grain analysis reveals a systematic misorientation of YBCO with respect to Ni: the YBCO [001] rotates toward the direction of the surface normal. The crystal mosaic (for rotation about the rolling direction) measured by a single diffraction pattern sampling a 0.5-{micro}m{sup 2} surface area is 0.7 degrees full width at half-maximum for YBCO grown on Ni grains with a low tilt; for more highly tilted grains, the YBCO patterns can no longer be measured, presumably due to the large mosaic. The YBCO mosaic over the entire area of a Ni grain is {approx}2.5 degrees and varies with grain size; the mosaic is smaller for larger grains.
- Research Organization:
- Argonne National Laboratory (ANL)
- Sponsoring Organization:
- SC
- DOE Contract Number:
- AC02-06CH11357
- OSTI ID:
- 917246
- Report Number(s):
- ANL/XSD/JA-60073
- Journal Information:
- J. Mater. Res., Journal Name: J. Mater. Res. Journal Issue: 3 ; Mar. 2007 Vol. 22; ISSN JMREEE; ISSN 0884-2914
- Country of Publication:
- United States
- Language:
- ENGLISH
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