Abstract
High Tc superconducting powders and thin films on silicon have been fabricated by the sol-gel process. Both powder and film preparation involved the synthesis of metal alkoxides, followed by the complexation of yttrium, barium, and copper alkoxides in a common solvent. Bulk gels were then vacuum dried and fired at 700 and 950 °C in flowing oxygen. Thin films on (100) silicon were fired at 700 °C in flowing oxygen. Susceptibility vs temperature measurements showed that the thin films on silicon had a Tc of 40 K while the bulk gels fired under the same conditions had a Tc of 75 K. The sample fired at 950 °C was superconducting at 90 K.
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Kramer, S., Wu, K. & Kordás, G. Preparation of thin Film YBa2CU3O6+X Ceramic Superconductors by the Sol-Gel Process. MRS Online Proceedings Library 99, 323–326 (1987). https://doi.org/10.1557/PROC-99-323
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DOI: https://doi.org/10.1557/PROC-99-323