Effect of High-Temperature, High-Oxygen-Fugacity Annealing on the Stability of the (Bi,Pb)2Sr2Ca2Cu3O10 ±δ-type Compound |
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| Authors: | Seyed M Allemeh Kenneth H Sandhage |
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| Affiliation: | Department of Materials Science and Engineering, The Ohio State University, Columbus, Ohio 43210 |
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| Abstract: | The stability of the (Bi,Pb)2Sr2Ca2Cu3O10±δ-type compound has been evaluated under conditions of elevated temperature (500°-860°C) and elevated oxygen fugacity (i.e., in O2/Ar gas mixtures containing ≤120% O2, at total pressures of 5207 MPa). At sufficiently high oxygen fugacities and temperatures, the (Bi,Pb)2Sr2Ca2Cu3O10±δ-type compound transformed into a mixture of a strontium-rich (Bi,Pb)1-(Sr,Ca,Cu)2Oy-type compound, a calcium-rich (Bi,Pb)2-(Sr,Ca,Cu)2Oy-type compound, CuO, and a small amount of (Sr,Ca)O. The decomposition of the (Bi,Pb)2Sr2Ca2-Cu3O10±δ-type compound was accompanied by a 2%-3% weight gain, which was consistent with an oxidation reaction. The conditions of oxygen fugacity and temperature leading to decomposition, and the resulting decomposition products, are compared for the (Bi,Pb)2Sr2Ca2Cu2O10±δ-type and Bi2Sr2Ca1Cu2O8±Ψ-type compounds. |
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