Practical superconductor development for electrical power applications : annual report for FY 2001. Page: 41 of 88
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I II III II III II III II III II III II III II III II I
0.8
0
0.7
u. 0.6
0.5
720 740 760 780
Temperature ( C)
Fig. 35. FWHMs of O-scan vs. temperature during second heat treatment of samples
made by the TFA process.
Raman microspectroscopy was used to investigate the effect of heat
treatment temperature on c-axis alignment, defect structures, oxygen
stoichiometry, and second-phase formation. Figure 37 shows representative
Raman spectra for samples processed at each of the five heat-treatment
temperatures. The spectra were recorded in the xx/yy mode, i.e., with the laser
excitation and observation directions perpendicular to the substrate and hence
(presumably) also perpendicular to the a-b planes of all epitaxial YBCO grains.
In this configuration, a perfectly epitaxial, defect- and impurity-free YBCO film
should exhibit only one band (marked with an inverted triangle in Fig. 37)
between 200 and 800 cm-1. This band, nominally at ~340 cm-1, is the out-of-phase
02/03 mode of YBCO.33
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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/m1/41/: accessed July 17, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.