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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Solovyov, V.F. Wiesmann, H.J. Li-Jun Wu Yimei Zhu Suenaga, M. Norton, D. Marken, K.R. |
| Copyright Year | 2002 |
| Abstract | Some coated conductor applications require a YBCO layer at least 5 /spl mu/m thick with high J/sub c/. The growth of thick c-axis oriented epitaxial layers using the barium fluoride ex-situ technology is not always possible. Films over 3 /spl mu/m thick have more undesirable a-oriented and random grains than thinner ones. We present an analysis of thick film nucleation and conclude that thick precursor layers impede out-diffusion of the ex-situ reaction product, HF. High impedance for HF diffusion results in large variations of the chemical potential of the growth reaction and disruption of the nucleation process. We conclude that a solution for c-axis growth is control of the precursor permeability. A method is described for controlling the permeability of precursor layers. Using this technique we were able to grow c-axis oriented 5-/spl mu/m thick films on oxide-buffered Ni tape with J/sub c/(0 T) = 4 /spl times/ 10/sup 5/ A/cm/sup 2/ and J/sub c/(1 T) = 8 /spl times/ 10/sup 4/ A/cm/sup 2/. |
| Sponsorship | Council on Superconductivity Appl. Superconductivity Conference Inc MIT |
| Starting Page | 2474 |
| Ending Page | 2476 |
| Page Count | 3 |
| File Size | 445738 |
| File Format | |
| ISSN | 10518223 |
| Volume Number | 13 |
| Issue Number | 2 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2003-06-01 |
| Publisher Place | U.S.A. |
| Access Restriction | One Nation One Subscription (ONOS) |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Yttrium barium copper oxide Chemical analysis Thick films Impedance Hafnium Permeability Conductors Epitaxial layers Chemical processes Chemical products |
| Content Type | Text |
| Resource Type | Article |
| Subject | Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering |
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