Solid state synthesis of Bi2Sr2CaCu2Ox superconductor

Autor:	K.C. Goretta, Michael T. Lanagan, J.M. Frommelt, Ira Bloom, C.-T. Wu, M.C. Hash
Rok vydání:	1991
Předmět:	Superconductivity Range (particle radiation) Mechanical Engineering Solid-state Analytical chemistry chemistry.chemical_element Mineralogy Partial pressure Condensed Matter Physics Oxygen chemistry Mechanics of Materials Phase (matter) General Materials Science Total pressure Stoichiometry
Zdroj:	Materials Research Bulletin. 26:1269-1276
ISSN:	0025-5408
DOI:	10.1016/0025-5408(91)90141-8
Popis:	The high-temperature superconducting material Bi 2 Sr 2 CaCu 2 O x (2212) was synthesized by reaction of oxides and carbonates. Several stoichiometries and a range of temperatures and oxygen partial pressures were investigated for the production of pure 2212. The reaction sequence to form Bi 2 Sr 2 CaCu 2 O x was found to consist of initial formation of Bi compounds, their subsequent reaction to form the Bi 2 Sr 2 CuO x phase and CaCu oxides, and a slow reaction to form the Bi 2 Sr 2 CaCu 2 O x phase. The best powder was made from a Bi:Sr:Ca:Cu composition equal to 2.0:1.7:1.0:2.0. The optimum heat treatment was found to consist of initial heating to about 725 °C in flowing oxygen at a reduced total pressure of 5 x 10 2 Pa, followed by brief heating in air to about 885 °C, and, finally heating in air at 842 °C for 2 to 3 days.
Databáze:	OpenAIRE
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