摘要:
A superconductive material is disclosed which has the following composition: (R 1-x Ca x )(Ba 1-y La y )₂Cu₄O₈ wherein R is at least one element selected from Y, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb and Lu, x is a number in the range of 0-0.3 and y is a number in the range of 0.001-0.3 with the proviso that y is not greater than 0.2 when x is not 0.
摘要:
A superconductive material is disclosed which has the following composition: (R 1-x Ca x )(Ba 1-y La y )₂Cu₄O₈ wherein R is at least one element selected from Y, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb and Lu, x is a number in the range of 0-0.3 and y is a number in the range of 0.001-0.3 with the proviso that y is not greater than 0.2 when x is not 0.
摘要:
The present invention provides an oxide superconductor which has a relatively high transition temperature T c . This superconductor has the chemical formula (R 1-x Ca x )(Ba 1-y Sr y )₂Cu₃O 7-z wherein R is at least one rare earth element selected from the group consisting of Tm, Yb and Lu, x is within the range of 0.1 ≦ x ≦ 0.5, y is within the range of 0.1 ≦ y ≦ 0.4 and z is within the range of 0.05 ≦ z ≦ (x/2 + 0.5). The invention further provides a method for producing the oxide superconductor which comprises firing a composition of the formula (R 1-x Ca x )(Ba 1-y Sr y )₂Cu₃O 7-z wherein R is at least one rare earth element selected from the group consisting of Tm, Yb and Lu, x is within the range of 0.1 ≦ x ≦ 0.5 and y is within the range of 0.1 ≦ y ≦ 0.4 at a temperature of from 750°C to the melting temperature of the composition under an oxygen partial pressure P(O₂) of 0.001 atm ≦ P(O₂) ≦ 0.2 atm and then heat treating the composition to adjust the oxygen loss z to 0.05 ≦ z ≦ (x/2 + 0.5).
摘要:
A method for producing an oxide superconductor formed according to a chemical composition formula (R 1-x Ca x )(Ba 1-y Sr y )₂Cu₄O₈ and having a transition temperature of 77K or above, comprising the step of causing a reaction between (R 1-x Ca x )(Ba 1-y Sr y )₂Cu₃O 7-z and a Cu material such as CuO, wherein R stands for one or more rare earth elements selected from the group consisting of Y, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm and Yb, and wherein 0.01 ≦ x ≦ 0.25, 0 ≦ y ≦ 0.5, and 0 ≦ z ≦ 1. The advantage of this production method is that this production method does not require a hot static pressing process which takes a long time.
摘要翻译:根据化学组成式(R1-xCax)(Ba1-ySry)2Cu4O8形成的转变温度为77K以上的氧化物超导体的制造方法,其特征在于,包括使(R1-xCax)(Ba1 -ySry)2 Cu 3 O 7-z和诸如CuO的Cu材料,其中R代表选自Y,Nd,Sm,Eu,Gd,Dy,Ho,Er,Tm和Yb中的一种或多种稀土元素, 并且其中0.01≤x≤0.25,0≤y≤0.5且0≤z≤1。该生产方法的优点是该生产方法不需要热静电 压制过程需要很长时间。
摘要:
An oxide superconductor which has a composition expressed by the following general formula and whose crystal structure is 1222-phase structure. (where M represents at least one element selected from the group consisting of Y, La, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Yb, and Lu, and a, x, y, and z denote the numbers which satisfy 0.3 ≦ a 0.7, 0
摘要:
A superconducting material is disclosed which includes oxides of metals having the following composition: (Pb 1-z Cu z )((Sr 1-y Ba y ) 1-v Ca v )₂(A 1-x Ca x )Cu₂ wherein A is at least one element selected from the group consisting of Y, La, Nd, Sm, Eu, Gd, Ho, Er, Yb and mixtures of at least one of Y, La, Nd, Sm, Eu, Gd, Ho, Er and Yb with at least one of Tb, Tm and Lu, x, y, v and z are numbers satisfying the following conditions: 0 ≦ x ≦ 0.4, 0.1 ≦ y ≦ 0.7, 0 ≦ v ≦ 0.2x, and 2y - 0.4 ≦ z ≦ 2y + 0.2 with the proviso that 0.6-x ≦ z