Preparation method of FeTeSe polycrystalline superconductor

Abstract

The invention provides a preparation method of a FeTe1-xSex polycrystalline superconductor. The preparation method comprises the following steps: (1) proportionally mixing and sufficiently grinding Fepowder, Te powder and Se powder, performing tabletting, putting the mixture into a quartz tube of which one end is sealed, vacuumizing the quartz tube, and sealing the other end of the quartz tube; (2) adopting microwave heating, and after cooling, obtaining a FeTe1-xSex polycrystalline blank; and (3) putting the FeTe1-xSex polycrystalline blank in a heating furnace for annealing, and cooling theFeTe1-xSex polycrystalline blank to obtain a FeTe1-xSex polycrystalline superconductor. According to the method, energy consumed in the preparation process of the FeTe1-xSex superconducting materialis reduced through the rapid synthesis characteristic of microwaves, and the cost is saved. Due to the fact that heat is almost concentrated on the raw materials in the microwave in-situ heating process, the influence of the high temperature on other materials is avoided when the raw materials are compounded to other materials or workpieces. In addition, the grain boundary connection performance is improved through the non-thermodynamic effect of microwaves in the material synthesis process, and the material density is improved, so that the FeTe1-xSex superconducting material with very high critical current density is obtained, and the practicability of the FeTe1-xSex superconducting material is greatly promoted.

Description

technical field

[0001] The invention belongs to the technical field of preparation of superconducting materials, in particular to FeTe with high critical current density 1-x Se x Methods for the preparation of polycrystalline superconductors. Background technique

[0002] Iron-based superconductor is another new type of high-temperature superconductor after copper oxide high-temperature superconductor. Since the discovery of iron-based high-temperature superconducting materials, their practical application has attracted much attention. Compared with traditional alloy superconducting materials, it has a higher superconducting transition temperature, upper critical field and critical current density, and its current density is less dependent on the magnetic field. These characteristics make iron-based high-temperature superconducting in the field of strong electricity Especially in the application of high field magnets, it has unique advantages. On the other hand, iron-bas...

Examples

Embodiment 1

[0030] This example is used to specifically illustrate the preparation method of the FeTeSe polycrystalline superconductor of the present invention.

[0031](1) Mix Fe powder (purity 99.9%), Te powder (purity 99.999%) and Se powder (purity 99.999%) in an atomic ratio of 1:0.6:0.4 and grind them thoroughly for 30 minutes, take out 0.3 grams and put them in In a mold with a diameter of 8 mm, a small piece with a thickness of 1 mm is pressed through the mold under a pressure of 400 MPa, and the small piece is packed into a quartz tube with one end sealed. The quartz tube containing the raw material is evacuated by a molecular pump, and the vacuum degree is 10 -3 Pa or above, and seal the other port with a welding gun to ensure that the sample is in an oxygen-free environment.

[0032] (2) Put the quartz tube sealed with raw materials obtained in step (1) into the center of the cavity of a microwave oven (microwave oven model is EM-310BX, Sanyo), take out the microwave oven turnt...

Embodiment 2

[0050] This example is used to specifically illustrate the preparation method of the FeTeSe polycrystalline superconductor of the present invention.

[0051] (1) Mix Fe powder (purity 99.9%), Te powder (purity 99.999%) and Se powder (purity 99.999%) in an atomic ratio of 1:0.4:0.6 and grind them thoroughly for 30 minutes, take out 0.3 grams and put them in In a mold with a diameter of 8 mm, a small piece with a thickness of 1 mm is pressed through the mold under a pressure of 400 MPa, and the small piece is packed into a quartz tube with one end sealed. The quartz tube containing the raw material is evacuated by a molecular pump, and the vacuum degree is 10 -3 Pa or above, and seal the other port with a welding gun to ensure that the sample is in an oxygen-free environment.

[0052] (2) Put the quartz tube sealed with raw materials obtained in step (1) into the center of the cavity of a microwave oven (microwave oven model is EM-310BX, Sanyo), take out the microwave oven turn...

Embodiment 3

[0057] This example is used to specifically illustrate the preparation method of the FeTeSe polycrystalline superconductor of the present invention.

[0058] (1) Mix Fe powder (purity 99.9%), Te powder (purity 99.999%) and Se powder (purity 99.999%) in an atomic ratio of 1:0.5:0.5 and grind them thoroughly for 30 minutes, take out 0.3 grams and put them in In a mold with a diameter of 8 mm, a small piece with a thickness of 1 mm is pressed through the mold under a pressure of 400 MPa, and the small piece is packed into a quartz tube with one end sealed. The quartz tube containing the raw material is evacuated by a molecular pump, and the vacuum degree is 10 -3 Pa or above, and seal the other port with a welding gun to ensure that the sample is in an oxygen-free environment.

[0059] (2) Put the quartz tube sealed with raw materials obtained in step (1) into the center of the cavity of a microwave oven (microwave oven model is EM-310BX, Sanyo), take out the microwave oven turn...

technical field

[0001] The invention belongs to the technical field of preparation of superconducting materials, in particular to FeTe with high critical current density 1-x Se x Methods for the preparation of polycrystalline superconductors. Background technique

[0002] Iron-based superconductor is another new type of high-temperature superconductor after copper oxide high-temperature superconductor. Since the discovery of iron-based high-temperature superconducting materials, their practical application has attracted much attention. Compared with traditional alloy superconducting materials, it has a higher superconducting transition temperature, upper critical field and critical current density, and its current density is less dependent on the magnetic field. These characteristics make iron-based high-temperature superconducting in the field of strong electricity Especially in the application of high field magnets, it has unique advantages. On the other hand, iron-bas...

Examples

Embodiment 1

[0030] This example is used to specifically illustrate the preparation method of the FeTeSe polycrystalline superconductor of the present invention.

[0031](1) Mix Fe powder (purity 99.9%), Te powder (purity 99.999%) and Se powder (purity 99.999%) in an atomic ratio of 1:0.6:0.4 and grind them thoroughly for 30 minutes, take out 0.3 grams and put them in In a mold with a diameter of 8 mm, a small piece with a thickness of 1 mm is pressed through the mold under a pressure of 400 MPa, and the small piece is packed into a quartz tube with one end sealed. The quartz tube containing the raw material is evacuated by a molecular pump, and the vacuum degree is 10 -3 Pa or above, and seal the other port with a welding gun to ensure that the sample is in an oxygen-free environment.

[0032] (2) Put the quartz tube sealed with raw materials obtained in step (1) into the center of the cavity of a microwave oven (microwave oven model is EM-310BX, Sanyo), take out the microwave oven turnt...

Embodiment 2

[0050] This example is used to specifically illustrate the preparation method of the FeTeSe polycrystalline superconductor of the present invention.

[0051] (1) Mix Fe powder (purity 99.9%), Te powder (purity 99.999%) and Se powder (purity 99.999%) in an atomic ratio of 1:0.4:0.6 and grind them thoroughly for 30 minutes, take out 0.3 grams and put them in In a mold with a diameter of 8 mm, a small piece with a thickness of 1 mm is pressed through the mold under a pressure of 400 MPa, and the small piece is packed into a quartz tube with one end sealed. The quartz tube containing the raw material is evacuated by a molecular pump, and the vacuum degree is 10 -3 Pa or above, and seal the other port with a welding gun to ensure that the sample is in an oxygen-free environment.

[0052] (2) Put the quartz tube sealed with raw materials obtained in step (1) into the center of the cavity of a microwave oven (microwave oven model is EM-310BX, Sanyo), take out the microwave oven turn...

Embodiment 3

[0057] This example is used to specifically illustrate the preparation method of the FeTeSe polycrystalline superconductor of the present invention.

[0058] (1) Mix Fe powder (purity 99.9%), Te powder (purity 99.999%) and Se powder (purity 99.999%) in an atomic ratio of 1:0.5:0.5 and grind them thoroughly for 30 minutes, take out 0.3 grams and put them in In a mold with a diameter of 8 mm, a small piece with a thickness of 1 mm is pressed through the mold under a pressure of 400 MPa, and the small piece is packed into a quartz tube with one end sealed. The quartz tube containing the raw material is evacuated by a molecular pump, and the vacuum degree is 10 -3 Pa or above, and seal the other port with a welding gun to ensure that the sample is in an oxygen-free environment.

[0059] (2) Put the quartz tube sealed with raw materials obtained in step (1) into the center of the cavity of a microwave oven (microwave oven model is EM-310BX, Sanyo), take out the microwave oven turn...

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