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Method for preparing monodomain (gd/y)-ba-cu-o superconducting bulk materials by liquid phase infiltration

A -ba-cu-o, superconducting block technology, applied in the field of high-temperature cuprate superconducting materials, can solve the problems of complete sample growth and unfavorable superconducting properties, long period, loss of sample liquid phase, etc., to ensure stability Growth and superconducting properties, shortening the experimental period, avoiding the effect of liquid phase loss

Inactive Publication Date: 2016-08-24
TIANJIN NORMAL UNIVERSITY
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Problems solved by technology

It can be seen that no matter which treatment method is used, two kinds of precursor powders are used in the whole preparation process, which makes the preparation process of composite superconducting bulk material more complicated, the cycle is long, the efficiency is low and the cost is high
In addition, due to the (Gd x Y 1-x ) Ba 2 Cu 3 o 7- δ or GdBa 2 Cu 3 o 7- δ The phase will undergo heterogeneous melting, and the sample is prone to problems such as liquid phase loss, shrinkage deformation, and internal holes, which will adversely affect the complete growth and superconductivity of the sample.

Method used

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  • Method for preparing monodomain (gd/y)-ba-cu-o superconducting bulk materials by liquid phase infiltration
  • Method for preparing monodomain (gd/y)-ba-cu-o superconducting bulk materials by liquid phase infiltration
  • Method for preparing monodomain (gd/y)-ba-cu-o superconducting bulk materials by liquid phase infiltration

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Synthesis (Gd x Y 1-x ) 2 BaCuO 5 Precursor powder:

[0027] Take 51.5864g Gd 2 o 3 , 32.1346g Y 2 o 3 Mix well with 43.6391g BaO, 22.6399g CuO initial powder, namely Gd 2 o 3 , Y 2 o 3 The molar ratio of BaO and CuO primary powder is 0.5:0.5:1:1 (corresponding to x=0.5), and it is made by solid state reaction method (Gd 0.5 Y 0.5 ) 2 BaCuO 5 precursor powder;

[0028] (2) Preparation of liquid phase source powder:

[0029] Take 25.5000g (Gd 0.5 Y 0.5 ) 2 BaCuO 5 Precursor powder mixed with 66.7681g BaO, 57.7319g CuO initial powder, namely (Gd 0.5 Y 0.5 ) 2 BaCuO 5 The molar ratio of the precursor powder to the initial powder of BaO and CuO is 1:9:15, which is used as the liquid phase source powder;

[0030] (3) Press the precursor block:

[0031] Take 10g respectively (Gd 0.5 Y 0.5 ) 2 BaCuO 5 Precursor powder and 20g liquid phase source powder were put into a cylindrical mold (diameter 26mm) and pressed into equal diameter (Gd x Y 1-...

Embodiment 2

[0041] In synthesis (Gd x Y 1-x ) 2 BaCuO 5 In the precursor powder step (1), take 11.5115g Gd 2 o 3 , 64.5375g Y 2 o 3 Mix evenly with 48.6905g BaO, 25.2605g CuO initial powder, namely Gd 2 o 3 , Y 2 o 3 The molar ratio of BaO and CuO primary powder is 0.1:0.9:1:1 (corresponding to x=0.1), and it is made by solid state reaction method (Gd 0.1 Y 0.9 ) 2 BaCuO 5 Precursor powder.

[0042] In step (2) of preparing liquid source powder, take 23.2649g (Gd 0.1 Y 0.9 ) 2 BaCuO 5 Precursor powder mixed with 67.9668g BaO, 58.7683g CuO initial powder, namely (Gd 0.1 Y 0.9 ) 2 BaCuO 5 The molar ratio of the precursor powder to the initial powder of BaO and CuO is 1:9:15, which is used as the liquid phase source powder.

[0043] In step (3) of pressing the precursor block, take 10g (Gd 0.1 Y 0.9 ) 2 BaCuO 5 Precursor powder and 17.5g liquid phase source powder were put into a cylindrical mold (diameter 26mm) and pressed into equal diameter (Gd x Y 1-x ) 2 BaC...

Embodiment 3

[0047] In synthesis (Gd x Y 1-x ) 2 BaCuO 5 In the precursor powder step (1), take 84.1278g Gd 2 o 3 , 5.8229g Y 2 o 3 Mix well with 39.5374g BaO, 20.5119g CuO initial powder, namely Gd 2 o 3 , Y 2 o 3 The molar ratio with BaO and CuO primary powder is 0.9:0.1:1:1 (corresponding to x=0.9), and it is made by solid state reaction method (Gd 0.9 Y 0.1 ) 2 BaCuO 5 Precursor powder.

[0048] In step (2) of preparing liquid source powder, take 27.6577g (Gd 0.9 Y 0.1 ) 2 BaCuO 5 Precursor powder mixed with 65.6109g BaO, 56.7314g CuO initial powder, namely (Gd 0.9 Y 0.1 ) 2 BaCuO 5 The molar ratio of the precursor powder to the initial powder of BaO and CuO is 1:9:15, which is used as the liquid phase source powder.

[0049] In step (3) of pressing the precursor block, take 10g (Gd 0.9 Y 0.1 ) 2 BaCuO 5 Precursor powder and 22.5g liquid phase source powder were put into a cylindrical mold (diameter 26mm) and pressed into equal diameter (Gd x Y 1-x ) 2 BaCuO ...

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Abstract

The invention discloses a method for preparing a single-domain (Gd / Y)-Ba-Cu-O superconductive bulk by a liquid phase infiltration method. The method comprises the steps of synthesizing (GdxY(1-x))2BaCuO5 precursor powder, preparing liquid phase source powder, pressing a precursor block, assembling the precursor block, carrying out infiltrating growth on a single-domain (Gd / Y)-Ba-Cu-O bulk and carrying out infiltration treatment. The (GdxY(1-x))2BaCuO5 precursor powder is synthesized by Gd2O3, Y2O3, BaO and CuO initial powder, the mixture of the (GdxY(1-x))2BaCuO5 precursor powder and the BaO and CuO initial powder serves as the liquid phase source powder, so that only the (GdxY(1-x))2BaCuO5 precursor powder is needed in the infiltrating growth process of the single-domain (Gd / Y)-Ba-Cu-O superconductive bulk, further, the experiment link is simplified, the experiment period is shortened, and the preparation efficiency is improved. According to the method, the shape of a sample is kept, and the problems of the loss of the liquid phase, internal holes, shrinkage distortion and the like of the sample are avoided, so that the stable growth and the superconductive performance of the sample can be ensured.

Description

technical field [0001] The invention belongs to the technical field of high-temperature copper oxide superconducting materials, and in particular relates to a method for preparing monodomain (Gd / Y)-Ba-Cu-O superconducting block materials by liquid phase infiltration. Background technique [0002] High-temperature superconducting materials and their application technologies have important application value in energy, transportation, national defense, medical technology, and major scientific projects. Many potential, even irreplaceable application prospects. Due to the stronger magnetic flux pinning ability in the liquid nitrogen temperature region (77K) and the ability to maintain a higher critical current density under high field (J c ), rare earth-based copper oxide series superconductors (RE-Ba-Cu-O, RE=Y, Gd, Eu, Sm, Nd, etc.) have better application value, and are the most promising and promising high-temperature superconducting material family. One of the superconduct...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/22C04B35/45C04B35/505C04B35/622
CPCC04B35/45C04B35/505C04B35/622C30B29/22
Inventor 李国政邓建华董磊
Owner TIANJIN NORMAL UNIVERSITY
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