Method for preparing calcium doped REBCO (rare earth barium copper oxygen) high temperature superconductivity standard single crystal

A high-temperature superconducting, single crystal technology, applied in the direction of single crystal growth, crystal growth, single crystal growth, etc., can solve the problems of slow growth rate, dependence on pulling method, pollution of other elements, etc. The method is simple, easy to prepare, prevent pollution effect

Inactive Publication Date: 2014-03-12
SHANGHAI JIAO TONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to provide a method for preparing calcium-doped REBCO high-temperature superconducting quasi-single crystals using the top seed melt texture, which overcomes the reliance on the pulling method in the prior art. Crucible, slow growth, other elements of pollution and other defects

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  • Method for preparing calcium doped REBCO (rare earth barium copper oxygen) high temperature superconductivity standard single crystal
  • Method for preparing calcium doped REBCO (rare earth barium copper oxygen) high temperature superconductivity standard single crystal
  • Method for preparing calcium doped REBCO (rare earth barium copper oxygen) high temperature superconductivity standard single crystal

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Embodiment 1

[0035] In this example, if figure 1 and figure 2 As shown, in the top seed melt texture method, the schematic diagram of the placement of seed crystal 1 and precursor 2 in the growth furnace, and the schematic diagram of the temperature program of seed crystal 1 and precursor 2 for the growth of the molten structure are respectively given. Specifically, a method for preparing a calcium-doped YBCO high-temperature superconducting quasi-single crystal in this embodiment includes the following steps:

[0036] 1. According to the ratio of Y:Ba:Cu=1:2:3, Y 2 o 3 、BaCO 3 Mix with CuO powder to obtain Y123 phase powder.

[0037] 2. After fully grinding the powder of Y123 phase in step 1, sintering in air at 900°C for 48 hours, grinding the sintered powder again, and sintering in air at 900°C for 48 hours, repeating three times to obtain Y123 with uniform and single composition Pure phase powder.

[0038] 3. The Y123 pure phase powder obtained in step 2, CaCO 3 Powder, CeO 2 ...

Embodiment 2

[0050] A method for preparing a calcium-doped YBCO high-temperature superconducting quasi-single crystal, comprising the following steps:

[0051] 1. According to the ratio of Y:Ba:Cu=1:2:3, Y 2 o 3 、BaCO 3 Mix with CuO powder to obtain Y123 phase powder.

[0052] 2. After fully grinding the Y123 phase powder in step 1, sintering in air at 900°C for 48 hours, grinding the sintered powder again, and sintering in air at 900°C for 48 hours, repeating three times to obtain Y123 with uniform and single composition Pure phase powder.

[0053] 3. The Y123 pure phase powder obtained in step 2, CaCO 3 Powder, CeO 2 Powder according to Y123+1wt%CaCO 3 +0.3wt%CeO 2 After fully grinding and mixing the ingredients, take 30g of the mixed powder and put it into a mold, and press it into a cylindrical precursor with a diameter of 30mm.

[0054] 4. Select a c-axis oriented NdBCO / YBCO / MgO thin film seed crystal material with a size of 2mm×2mm, where 2mm×2mm means that the length and wid...

Embodiment 3

[0063] A method for preparing a calcium-doped YBCO high-temperature superconducting quasi-single crystal, comprising the following steps:

[0064] 1. According to the ratio of Y:Ba:Cu=1:2:3, Y 2 o 3 、BaCO 3 Mix with CuO powder to obtain Y123 phase powder.

[0065] 2. After fully grinding the Y123 phase powder in step 1, sintering in air at 900°C for 48 hours, grinding the sintered powder again, and sintering in air at 900°C for 48 hours, repeating three times to obtain Y123 with uniform and single composition Pure phase powder.

[0066] 3. The Y123 pure phase powder obtained in step 2, CaCO 3 Powder, CeO 2 Powder according to Y123+15wt%CaCO 3 +1.5wt%CeO 2 After fully grinding and mixing the ingredients, take 10g of the mixed powder and put it into a mold, and press it into a cylindrical precursor with a diameter of 20mm.

[0067] 4. Select a c-axis oriented NdBCO / YBCO / MgO thin film seed crystal material with a size of 2mm×2mm, where 2mm×2mm means that the length and wi...

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Abstract

The invention discloses a method for preparing calcium doped REBCO (rare earth barium copper oxygen) high temperature superconductivity standard single crystal. The method comprises steps of a) preparing powder of RE123 phase; b) preparing a precursor; c) putting a seed crystal on the upper surface of the precursor; and d) putting the precursor and the seed crystal in a crystal growth furnace for fusing the texture so as to grow a high temperature superconductivity material, wherein the precursor in step b) is a cylindrical precursor formed through uniformly mixing the powder of RE123 phase obtained in step a) according to the proportion of RE123+(0-15)wt%CaCO3+(0.3-1.5)wt%CeO2 and then pressing. According to the method, the calcium doped REBCO high temperature superconductivity standard single crystal is prepared through fusing the texture of top seed crystal, in the preparation process, the CaCO3 only needs to be mixed in the precursor powder so as to be pressed into the cylindrical precursor. The method is simple, easy to operate, completely repeatable and controllable.

Description

technical field [0001] The invention relates to a high-temperature superconducting material, in particular to a method for preparing a calcium-doped REBCO high-temperature superconducting quasi-single crystal. Background technique [0002] Since REBa 2 Cu 3 o x (referred to as REBCO, RE123, rare earth barium copper oxide, where RE=Y, Gd, Sm, Nd, etc.) superconductors have attracted widespread attention since they were discovered. Due to its properties such as complete diamagnetism, high critical current density, and high freezing magnetic field, REBCO superconductors have many potential applications in areas such as magnetic levitation forces, magnetic bearings, flywheel energy storage, and permanent magnets. [0003] For further scientific research and physical property analysis, REBCO high-temperature superconductors doped with chemical elements are of great significance. This is because the basic mechanism and basic research of element doping are not very systematic. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/22C30B15/00
Inventor 姚忻王伟崔祥祥郭林山陈媛媛彭波南陈尚荣
Owner SHANGHAI JIAO TONG UNIV
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