Tl2Ca1Ba2Cu2O8+xhighTcsuperconductors processed by the sol‐gel technique

Autor:	M. R. Teepe, G. Kordas
Rok vydání:	1990
Předmět:	Materials science High-temperature superconductivity Physics and Astronomy (miscellaneous) Analytical chemistry Mineralogy chemistry.chemical_element Barium Thermal treatment law.invention chemistry.chemical_compound chemistry law X-ray crystallography Alkoxide Calcination Particle size Sol-gel
Zdroj:	Applied Physics Letters. 57:1461-1463
ISSN:	1077-3118 0003-6951
DOI:	10.1063/1.103367
Popis:	Tl2Ca1Ba2Cu2O8+x high Tc superconductors were developed using a new alkoxide sol‐gel system. Barium‐, calcium‐, thallium‐methoxyethoxide and Cu(II) ethoxide precursors were used for the formation of homogeneous sols. Solubility of the Cu(II) ethoxide was aided by using a 2‐methoxyethanol/methyl ethylketone/toluene solvent system. The sols were characterized by small‐angle x‐ray scattering and transmission electron microscopy. The average particle size was 50 nm and the fractal dimension of these particles was 1.8. Powders were produced by rotary evaporation followed by thermal treatment in a closed container with excess thallium at 900 °C for various calcination times. Powders were characterized by x‐ray diffraction, resistivity, and magnetic susceptibility measurements, and chemical analysis. Samples exhibited transition temperatures between 100 and 110 K depending upon the processing conditions.
Databáze:	OpenAIRE
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