Reactions between YBa2Cu3O7?δ and La2O3 and SrCO3 |
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Authors: | Z Hegedüs |
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Institution: | (1) Department of Inorganic Chemistry, Arrhenius Laboratory, Stockholm University, 10691 Stockholm, Sweden |
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Abstract: | Solid state reactions at 925°C between the high-T c ceramic superconductor YBa2Cu3O7?δ and La2O3 and SrCO3, respectively, mixed in various molar ratiosr=MeOn/YBa2Cu3O7?δ, were studied using X-ray powder diffraction and scanning electron microscopy. The reaction between YBa2Cu3O7?δ and La2O3 yielded (La1?xBax)2CuO4?δ, withx≈0.075?0.10. La2?xBa1+xCu2O6?δ, withx≈0.2?0.25 and La-doped (Y1?xLax)2BaCuO5, withx≈0.10?0.15. Forr=3.0, Y-doped La2BaCuO5 resulted also. The reaction between YBa2Cu3O7?δ and SrCO3 yielded (Sr1?zBaz)2CuO3, withz≈0.1, Y2(Ba1?zSrz)CuO5, withz=0.1?0.15, and a nonsuperconducting compound with an approximate composition of Y(Ba0.5Sr0.5)5Cu3.5O10±δ. At values ofr≤2.0, unsubstituted YBa2Cu3O7?delta was found in the reaction products. |
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Keywords: | La2O3 SrCO3 YBa2Cu3O7− δ superconductors |
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