JPS63248721A - Superconductor - Google Patents

Abstract

PURPOSE:To obtain a superconductor having a high transition temp. and high critical current density by using Cu and Ag as the component B of a perovskite type superconductor represented by a formula ABO3, etc. CONSTITUTION:This superconductor is perovskite type superconductor rep resented by a formula ABO3, A2BO4 or A2BO3 [where A is one or more kinds of elements selected among the alkali metals and alkaline earth metals such as La, Ba, Sr, Yt, Yb and Ca, and B is Ag-added Cu such as Cu1-xAgx (x=0.01-0.3)]. Powder of oxide or the like of the component A is mixed with powder of oxide of the component B in a prescribed ratio corresponding to the compsn. and the powdery mixture is compression-molded and sintered at about 900 deg.C for about 5hr in an O2 atmosphere to obtain the superconductor.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a superconductor, and particularly to a superconductor having a high transition temperature and a high critical current density.

[Conventional technology] Conventionally, perovskite superconductors have been developed using the Zeitschrift Fehrfischikubi.

64, (1986) pp. 189-193, (Z.

Phys, B, 64 (1986) pp, 189-19
It is discussed in 3.

[Problems to be Solved by the Invention] In the prior art, the critical current density was low because of the ceramic-based material, and this point was not taken into consideration, which caused problems in practical application.

An object of the present invention is to increase the critical current density of the superconductor.

[Means for solving the problem] The above purpose is to solve the problem by using the superconducting compound A B O3-A 28
04- Among the elements constituting A2B01, B contains Cu and A
This is achieved by using g.

[Function] The A p B○1 type super-groove conductor was conventionally made of Cu, but by adding Ag to Cu, the carrier concentration increases and the critical current density increases.

[Example] The present invention will be explained below with reference to Examples.

As the A 2B 03 compound, using La and Ba for A and Cu and Ag for B, (La++F Bay)p+ (
Cu+-1A g x ) 03. Here y is 0
．． 4. Let x be 0.1. To synthesize a compound, half of the oxide of each element or the number of metals is mixed to have the above composition, and the powder is compression molded and molded in a 02 atmosphere.
It was obtained by performing a sintering treatment at 00°C for 5 hours. When the critical current of the superconductor obtained in this way was measured, it was found that the critical current of the compound where X=0.1 was about 1 compared to the case where X=O.
0 times the current flowed.

When the value of X is 0.01 or less, no significant effect is shown;
．． The maximum value is taken between 1 and 0.2. x) At 0.3, the effect decreases rapidly, so a range of 0.01 to 0.3 is appropriate.

[Effects of the Invention] According to the present invention, the critical current density of a perovskite compound superconductor can be increased, which is effective in developing superconducting application equipment that requires electric current.

Claims (1)

[Claims] 1. A perovskite superconductor represented by ABD_3, A_2BO_4, A_2BO_3, where A is La, Ba,
Consists of single or multiple elements of alkali and alkaline earth metals such as Sr, Yt, Yb, Ca, etc., and B is Cu
and a superconductor consisting of Ag. 2. A_2B in the item described in claim 1
A superconductor characterized in that when O_3 is represented by A_2(Cu_1_-_xAg_x)O_3, x is 0.01 to 0.3. 3. In the item described in claim 1, ABO_
A superconductor in which x is 0.01 to 0.3 when 3 is represented by A(Cu_1_-_xAg_x)O_3. 4. A_2B in the thing described in claim 1
A superconductor in which x is 0.01 to 0.3, where O_4 is represented by A(Cu_1_-_xAg_x)O_4.