Solid state reactions in the formation of Bi-Sr-Ca-Cu-oxide superconductor from metallo-organic precursors
| Autor: | Gustavo R. Paz-Pujalt |
|---|---|
| Rok vydání: | 1990 |
| Předmět: |
Strontium
Copper oxide Materials science Inorganic chemistry Oxide Energy Engineering and Power Technology chemistry.chemical_element Condensed Matter Physics Electronic Optical and Magnetic Materials chemistry.chemical_compound chemistry Phase (matter) X-ray crystallography Carboxylate Electrical and Electronic Engineering Thermal analysis Solid solution |
| Zdroj: | Physica C: Superconductivity. 166:177-184 |
| ISSN: | 0921-4534 |
| DOI: | 10.1016/0921-4534(90)90570-5 |
| Popis: | The preparation of Bi-Sr-Ca-Cu-oxide superconductor powders from citrate and carboxylate precursors is discussed. Solid state reactions following the pyrolysis of the precursors were examined by means of thermal analysis and X-ray diffraction. The initial powder was identified as a homogeneous mixture of bismuth trioxide, copper oxide and the double carbonate of strontium and calcium. With heat treatment CuBi 2 O 4 was detected as early as 500°C, and Bi 2 Sr 2 CuO 6 after 700°C. The Bi-Sr-Cu phase was identified as an intermediate for the formation of Bi-Sr-Ca-Cu-oxide superconductors. Further heat treatment at higher temperatures resulted in the formation of the 2212 superconductor phase. Various phase transformations were identified through-out the process. |
| Databáze: | OpenAIRE |
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