Bi<sub>2</sub>(Sr<sub>1-<i>x</i></sub>Ca<sub><i>x</i></sub>)<sub>2</sub>(Ca<sub>1-<i>y</i></sub>Y<sub><i>y</i></sub>)Cu<sub>2</sub>O<sub>δ</sub> の合成と超伝導転移

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  • Formation of Bi2(Sr1-xCax)2(Ca1-yYy)Cu2O.DELTA. and Its Superconducting Transition
  • Formation of Bi2(Sr1-xCax)2(Ca1-yYy)Cu2Oδ and Its Superconducting Transition
  • Formation of Bi2 Sr1 xCax 2 Ca1 yYy Cu2O デルタ and Its Superconducting Transition

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Single phase Bi2(Sr1-xCax)2(Ca1-yYy)Cu2Oδ is successfully prepared in the range of 0≤x≤0.8 and 0≤y≤0.6 by a solid state reaction in air. The optimal sintering temperature for forming the single phase is reduced from 875°C to 800°C with substitution of Y in the Ca site or with increased Ca in the Sr site. The lattice parameter c reduced from 3.081 to 3.017 nm by substituting Ca with Y and/or Sr with Ca. Bi2(Sr1.0Ca0.0)2(Ca0.8Y0.2)Cu2Oδ, is superconducting after heat treatment either in Ar or O2 while the phases Bi2(Sr0.6Ca0.4)2(Ca0.8Y0.2)Cu2Oδ, Bi2(Sr1.0Ca0.0)2(Ca0.4Y0.6)Cu2Oδ and Bi2(Sr0.4Ca0.6)2(Ca0.4Y0.6)Cu2Oδ are superconducting only after oxygenation. The oxygen stability and optimum heat treatment temperature for superconductivity depend on the Sr/Ca and Ca/Y ratios in Bi2(Sr1-xCax)2(Ca1-yYy)Cu2Oδ.<br>

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