Thallium based superconductors have the highest, reproducible transition temperatures to date, $\rm Tl\sb2Ba\sb2Ca\sb2Cu\sb3O\sb{x},$ at 122 K. Difficulty arises in preparing these materials using the common "shake and bake" procedure. The high temperature stability of BaCO$\sb3$ and the volatility of the $\rm Tl\sb2O\sb3$ pose additional problems which appear to be insurmountable. Thus, it is necessary to investigate alternative routes. / The use of a single phase precursor is an attractive option. One could pre-react the Ba-Ca-Cu starting materials and, in the final step, add an appropriate amount of $\rm Tl\sb2O\sb3$. The mixture would then be fired for a short period of time, preferably at temperatures below the volatility of $\rm Tl\sb2O\sb3$. / In order to successfully use a precursor route, the chemistry of the precursor material must be understood. The ternary BaO-CaO-CuO system is not well characterized. A methodical investigation of this system will provide a better understanding of the chemistry involved. / Presented in this paper is an investigation of selected regions of the ternary phase system. Two alternative preparative methods will be compared the common "shake and bake" method. Effects of time and heating temperature of these materials are examined and presented. / Source: Dissertation Abstracts International, Volume: 55-04, Section: B, page: 1412. / Director: Ronald J. Clark. / Thesis (Ph.D.)--The Florida State University, 1994.
| Identifer | oai:union.ndltd.org:fsu.edu/oai:fsu.digital.flvc.org:fsu_77173 |
| Contributors | Wholey, Deborah A., Florida State University |
| Source Sets | Florida State University |
| Language | English |
| Detected Language | English |
| Type | Text |
| Format | 156 p. |
| Rights | On campus use only. |
| Relation | Dissertation Abstracts International |
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