Method of manufacturing superconducting ceramics under a magnetic field
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorShunpei Yamazaki
Life of this patent
Estimating the term…
Abstract
A high Tc superconducting ceramics material is produced by a method in which a mixture of chemicals in suitable amounts is compacted into a desired form. The compact mixture is then fired and, at the same time, a magnetic field is apilied to the compacted mixture in a predetermined direction. By virtue of the application of magnetic field during firing, the orderliness of molecular arrangement is enhanced and an elevated transition temperature Tc is obtained.
Claims57
A method of manufacturing a superconducting ceramic material, said method including a step of forming a superconducting material from a mixture prepared in accordance with the stoichiometric formulae of (A1−xBx)yCuzOw, where A is one or more elements selected from Group IIIa of the Periodic Table, B is one or more elements selected from Group IIa of the Periodic Table, and x=0-1, y+2-4, z=1-4 and w=4-10, said mixture being heated in an oxidizing atmosphere at 500° C. to 1200° C. during said forming step under application of a magnetic field having a strength not lower than 500 Gauss such that a crystalline structure of the material is oriented in accordance with the applied magnetic field.
A method of manufacturing a superconducting ceramic material, said method including a step of forming a superconducting material from a mixture prepared in accordance with the stoichiometric formulae of (A1−xBx)yCuzOw, where A is one or more elements selected from Group Vb of the Periodic Table such as Bi, Sb and As, B is one or more elements selected from Group IIa of the Periodic Table, and x=0.3-1;
- y=2.0-4.0, z=1.0-4.0 and w=4.0-10.0, said mixture being heated in an oxidizing atmosphere at 500° to 1200° C. during said forming step under application of a magnetic field having a strength not lower than 500 Gauss such that a crystalline structure of the material is oriented in accordance with the applied magnetic field.
A method of manufacturing a superconducting ceramic material, said method including a step of forming a superconducting material from a mixture including a plurality of metals including at least one lanthanide and an oxygen constituent, heating said superconducting material in an oxidizing atmosphere at 500° to 1200° C. wherein a magnetic field is applied to said superconducting material during the heating step such that a crystalline structure of said material is oriented in accordance with the applied magnetic field.
A method of manufacturing a superconducting ceramic material, said method including a step of forming a superconducting material from a mixture including a plurality of metals including at least one lanthanide and an oxygen constituent, heating said superconducting material in an oxidizing atmosphere at 500° to 120° C. under an application of a magnetic field in a direction normal to an a-b plane of said material such that a crystalline structure of said material is oriented in accordance with the applied magnetic field.
A method of manufacturing a superconducting ceramic material, said method including the step of forming a superconducting material from a mixture including a plurality of metals including at least one lanthanide and an oxygen constituent, heating said superconducting material in an oxidizing atmosphere at 500° to 1200° C. under application of a magnetic field, wherein said ceramic material is compressed during the heating step.
A method of making a high-Tc superconductor comprising the steps of
- providing particles including a plurality of metals including at least one lanthanide and an oxygen constituent in admixture with one another as the constituent s of said superconductor and
- sintering said constituents in an oxidizing atmosphere at 500° to 1200° C.,
- wherein the improvement comprises the step of applying a magnetic field to said particles during said sintering step, said magnetic field being effective to substantially align said particles in said sintering step.
A method of manufacturing a superconducting ceramic material mixture prepared in accordance with the stoichiometric formula of (A1−xBx)yCuzOw, where A is one or more elements selected from Group IIIa of the Periodic Table, B is one or more elements selected from Group IIa of the Periodic Table, and x=0-1, y=2.0-4.0, z=1.0-4.0 and w=4.0-10.0, said mixture being consolidated by a pressing and firing step, wherein the improvement comprises the step of applying a magnetic field to the mixture during said pressing and firing step such that the atomic arrangement is ordered.
A method of making a high-Tc superconductor comprising the steps of providing particles including a plurality of metals including at least one lathanide and an oxygen constituent in admixture with one another as the constituents of said superconductor and consolidating said constituents by compacting said particles and sintering said compacted particles, wherein the improvement comprises the step of applying a magnetic field to said particles during said consolidating step, said magnetic field being effective to substantially align said particles in said consolidating step.
Dependencies are inferred from the claim text.