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A preparation method of nano-bismuth ferrite-doped yttrium-barium-copper-oxygen superconducting bulk material

A yttrium barium copper oxide and nano-iron technology is applied in the field of preparation of yttrium barium copper oxide superconducting bulk materials, which can solve the problems of time decay of superconducting performance, magnetic flux creep and the like, and achieve a simple and efficient process and superior superconducting performance. Effect

Inactive Publication Date: 2019-10-22
TIANJIN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the high-temperature superconductor works in the liquid nitrogen temperature region, the magnetic flux creep caused by thermal activation will appear inside, which will lead to the problem of serious decay of superconducting properties (such as trapped magnetic flux, magnetic levitation force, etc.) over time

Method used

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  • A preparation method of nano-bismuth ferrite-doped yttrium-barium-copper-oxygen superconducting bulk material
  • A preparation method of nano-bismuth ferrite-doped yttrium-barium-copper-oxygen superconducting bulk material
  • A preparation method of nano-bismuth ferrite-doped yttrium-barium-copper-oxygen superconducting bulk material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Prepare mixed powder:

[0030] Take 49.2302g Y 2 o 3 The nano powder is mixed with 33.4276g BaO, 17.3422g CuO initial powder, and 1gCeO is added at the same time 2 Initial powder and 0.1g BiFeO 3 Nano powder, namely Y 2 o 3 The molar ratio of nano powder to BaO and CuO initial powder is 1:1:1, and 1% (w / w) CeO is added at the same time 2 Starting powder and 0.1% (w / w) BiFeO 3 Nano powder, mix well, as solid phase mixed powder; take 7.4481g Y 2 o 3 Nano powder mixed with 50.5727g BaO, 41.9792g CuO initial powder, namely Y 2 o 3 The molar ratio of nano powder to BaO and CuO initial powder is 1:10:16, which is used as liquid phase mixed powder;

[0031] (2) Press the precursor block:

[0032] Take 5g of solid-phase mixed powder into cylindrical mold 1 (diameter 16mm) and press it into a solid-phase block; take 15g of liquid-phase mixed powder into cylindrical mold 2 (diameter 26mm) and press it into a liquid-phase block; The mass ratio of the solid-phase mi...

Embodiment 2

[0042] In the preparation of mixed powder step (1), take 49.2302g Y 2 o 3 The nano powder is mixed with 33.4276g BaO, 17.3422g CuO initial powder, and 1g CeO is added at the same time 2 Initial powder and 0.2g BiFeO 3 Nano powder, namely Y 2 o 3 The molar ratio of nano powder to BaO and CuO initial powder is 1:1:1, and 1% (w / w) CeO is added at the same time 2 Starting powder and 0.2% (w / w) BiFeO 3 Nano powder, mix well, as solid phase mixed powder; take 7.4481g Y 2 o 3 Nano powder mixed with 50.5727g BaO, 41.9792g CuO initial powder, namely Y 2 o 3 The molar ratio of nano powder to BaO and CuO initial powder is 1:10:16, which is used as liquid phase mixed powder;

[0043] Other steps are identical with embodiment 1. Preparation of 0.2% nano-BiFeO 3 Doped yttrium barium copper oxide superconducting bulk.

[0044] The prepared 0.2% nano-BiFeO 3 Doped yttrium-barium-copper-oxygen superconducting bulk material, the surface morphology is taken with a camera, and the ph...

Embodiment 3

[0047] In the preparation of mixed powder step (1), take 49.2302g Y 2 o 3 The nano powder is mixed with 33.4276g BaO, 17.3422g CuO initial powder, and 1g CeO is added at the same time 2 Initial powder and 0.3g BiFeO 3 Nano powder, namely Y 2 o 3 The molar ratio of nano powder to BaO and CuO initial powder is 1:1:1, and 1% (w / w) CeO is added at the same time 2 Starting powder and 0.3% (w / w) BiFeO 3 Nano powder, mix well, as solid phase mixed powder; take 7.4481g Y 2 o 3 Nano powder mixed with 50.5727g BaO, 41.9792g CuO initial powder, namely Y 2 o 3 The molar ratio of nano powder to BaO and CuO initial powder is 1:10:16, which is used as liquid phase mixed powder;

[0048] Other steps are identical with embodiment 1. Preparation of 0.3% nano-BiFeO 3 Doped yttrium barium copper oxide superconducting bulk.

[0049] The prepared 0.3% nano-BiFeO 3 Doped yttrium-barium-copper-oxygen superconducting bulk material, the surface morphology is taken with a camera, and the ph...

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Abstract

The invention discloses a preparation method of a yttrium-barium-copper-oxide superconductive block doped with nano bismuth ferrite. The preparation method comprises the following steps of preparing mixed powder, pressing a precursor block, assembling the precursor block, carrying out high-temperature heat treatment and carrying out oxygen-permeation treatment. The preparation method disclosed by the invention has the advantages that nano bismuth-ferrite particles are doped in a solid-phase block, grow after high-temperature melting, liquid-phase permeation and slow cooling, Y2Ba4CuBiOx phase is generated in the yttrium-barium-copper-oxide superconductive block as a second-phase particle, so that delta1-type pinning is improved; in addition, elemental substitution of Fe for the Cu site of YBa2Cu3O7-delta phase is initiated, so that the component fluctuation and weak superconductive areas in a superconductive matrix are caused, the delta Tc-type pinning of a sample is improved and finally better superconductive performance is obtained.

Description

technical field [0001] The invention belongs to the technical field of high-temperature copper oxide superconducting materials, and in particular relates to a preparation method of a nano-bismuth ferrite-doped yttrium-barium-copper-oxygen superconducting bulk material. Background technique [0002] 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 ), yttrium barium copper oxide (Y-Ba-Cu-O) high-temperature superconducting materials and their application technologies have always been one of the hot spots in the research fields of high-tech materials and high-tech applications in the world. However, when the high-temperature superconductor works in the liquid nitrogen temperature region, the magnetic flux creep caused by thermal activation will appear inside, which will lead to the serious problem of superconducting performance (such as trapped ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/50C04B35/622
Inventor 李国政
Owner TIANJIN NORMAL UNIVERSITY