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YBCO on Silver Substrates
The surface morphology of YBCO films deposited on polished Ag
substrates was examined by AFM. Unlike YBCO on single-crystal substrates,
grain boundaries are clearly seen in the plan view of YBCO on Ag (Fig. 20). The
film contains c-axis oriented grains with an average size of ~0.5 m as well as a
few uniformly dispersed a-axis oriented grains (Fig. 20). Also, a-axis oriented
grains were seen by SEM (Fig. 21). Only (00!) peaks were observed in the X-ray
diffraction pattern (Fig. 22), however, indicating that c-axis orientation was
dominant in the YBCO film. The strong c-axis alignment was confirmed by an
intense peak at 340 cm-1 in the Raman spectrum (Fig. 23). The YBCO (103) pole
figure (Fig. 24) revealed, however, that the YBCO on Ag had only fiber texture
with its c-axes aligned parallel to the substrate normal. No biaxial alignment was
evident, i.e., the a- and b-axes of YBCO were not preferentially aligned within the
plane of the film.0 5.00 "M
Fig. 20. Plan view by AFM of a YBCO film deposited directly
on Ag substrate at 755 C with inclination of 55 .
Cross-sectional TEM (Fig. 25) revealed an amorphous layer at the interface
between YBCO and the Ag substrate. The origin of this layer and its role in the
growth of YBCO are not yet fully understood and are being studied further. For
the sample deposited at 755 C with an inclination of 550, the thickness of the
amorphous layer was ~70 nm. Figure 26 shows the TEM EDS spectra of the20
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Cha, Y. S.; Dorris, S. E.; Dusek, J. T.; Emerson, J. E.; Erck, R. A.; Fisher, B. L. et al. Practical superconductor development for electrical power applications : annual report for FY 2001., report, May 2, 2002; Illinois. (https://digital.library.unt.edu/ark:/67531/metadc737902/m1/28/: accessed July 17, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.