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Method for rare earth 242 phase control component for growing superconducting block material

A technology of phase control and superconducting block, which is applied in the field of growing superconducting block with light rare earth 242 phase control component, can solve the problems of complex operation, slow growth of block, expensive equipment, etc., and achieve simple process, convenient operation, The effect of high growth rate

Inactive Publication Date: 2011-04-20
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the equipment required for this method is more expensive, and the operation is more complicated, and in a low-oxygen atmosphere, the growth rate of the block will also be affected and reduced.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1: Mixing Sm242 and Sm123 powders to grow samarium barium copper oxide bulk material with melt texture

[0019] 1. Use BaCO 3 , CuO and Sm 2 o 3 The powder is prepared as the original powder according to the composition ratio of Sm123 and Sm242.

[0020] 2. Fully grind the original powder evenly, sinter the Sm123 powder at about 900°C for 48 hours, and sinter the Sm242 at 810°C under nitrogen for 12 hours; The powder is ground and sintered again, and the same process is repeated three times.

[0021] 3. The obtained pure phase powder is mixed according to Sm123+(10~30) mol% Sm242 components, and the ground powder after sintering is pressed into A 20×10mm circular precursor sheet with a seed crystal placed on top to control orientation.

[0022] 4. Put the precursor sheet pressed in step 3 on the MgO single crystal substrate, and put the whole system into a sealed system.

[0023] 5. Raise the temperature to 950°C in 2 hours and keep it warm for 1 hour; co...

Embodiment 2

[0025] Embodiment 2: After mixing Nd242 and Nd123 powders, melt texture grows neodymium barium copper oxide bulk material

[0026] 1. Use BaCO 3 , CuO and Nd 2 o 3 The powder is prepared as the original powder according to the composition ratio of Nd123 and Nd242.

[0027] 2. Fully grind the original powder evenly, sinter the Nd123 powder at about 900°C for 48 hours, and sinter the Nd242 at 810°C under nitrogen for 12 hours; The powder is ground and sintered again, and the same process is repeated three times.

[0028] 3. The obtained pure-phase powder is mixed according to the Nd123+(10-30) mol% Nd242 component, and the ground powder after sintering is pressed into A 20×10mm circular precursor sheet with a seed crystal placed on top to control orientation.

[0029] 4. Put the precursor sheet pressed in step 3 on the MgO single crystal substrate, and put the whole system into a sealed system.

[0030] 5. Raise the temperature to 950°C in 2 hours and keep it warm for 1 h...

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Abstract

The invention relates to a method for growing a superconducting bulk material by utilizing rare earth 242 phase to control the composition. A precursor is added with light rare earth 242(LRE2Ba4Cu2O9, wherein, LRE is Nd and Sm, etc.) phase powder to control the composition. The ground and sintered LRE123 and LRE242 powder are mixed and ground according to a certain ratio and are pressed into the precursor; the corresponding seed crystal is put on the top part of the precursor, and the LRE-BCO bulk material is prepared by a melt textured method. In the method, the barium-rich rare earth 242 phase powder is utilized because the fused mass composition can be adjusted in a high temperature melting state, thereby effectively suppressing the substitution situation of light rare earth elements and barium elements in the peritectic reaction process, increasing the superconducting transformation temperature of the prepared light rare earth BCO superconductor and improving other performances of the prepared light rare earth BCO superconductor.

Description

technical field [0001] The invention relates to a method for growing a superconducting bulk material by controlling the composition of the light rare earth 242 phase, in particular to a precursor doped with barium-rich light rare earth 242 (LRE 2 Ba 4 Cu 2 o 9 , LRE242, in which the light rare earth mainly includes elements such as shank and neodymium) non-superconducting phase to control the melt composition, and realize the method of growing high-performance light rare earth barium copper oxide superconducting bulk material in air. Background technique [0002] Melt texturing (MTG) is generally considered to be a promising method for preparing bulk materials of barium-copper-oxygen high-temperature superconductors. Such superconducting bulk materials have many potential applications, such as magnetic levitation forces, magnetic bearings, flywheel energy storage, and permanent magnets. Therefore, the requirements for bulk materials at the application level are generally...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/22C30B19/00H01B12/06C04B35/01
CPCY02E40/642Y02E40/60
Inventor 姚忻孙立杰黄宜斌程玲
Owner SHANGHAI JIAO TONG UNIV
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