Method for improving transformation temperature of apical oxygen doping high temperature superconductor

A technology of high-temperature superconductivity and transition temperature, which is applied in the usage of superconducting elements, superconducting devices, superconducting/high-conducting conductors, etc., and can solve the problem of non-adjustable oxygen content at the top angle

Inactive Publication Date: 2008-07-30
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most high-temperature superconductors have fully occupied apex angle positions, and the oxygen content in apex angles is not adjustable.

Method used

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  • Method for improving transformation temperature of apical oxygen doping high temperature superconductor
  • Method for improving transformation temperature of apical oxygen doping high temperature superconductor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Sr 2 CuO 3 Precursor preparation:

[0021] Using a solid-phase reaction method under normal pressure, 99.9% pure SrCO 3 Mix and grind CuO powder at a molar ratio of 2:1, sinter at 950-1000°C, keep it warm for 24 hours or repeat the sintering three times to obtain single-phase Sr 2 CuO 3 compound.

[0022] High pressure synthesis of Sr 2 CuO 3+δ superconductor

[0023] Using SrO 2 As an oxygen source, by controlling the oxygen content, high temperature and high pressure to prepare Sr 2 CuO 3+δ sample. The precursor Sr 2 CuO 3 , SrO 2 and CuO according to the molar ratio of (1-x):2x:x (x=0.1) were weighed, mixed and uniformly ground in a glove box filled with argon. Then pressed into a small disc with a diameter of 5mm, wrapped with gold foil, and packaged in a Ф8×15mm NaCl cylinder. Put the pressed sample into the graphite furnace and put it into the high-pressure assembly device for high-pressure synthesis. The sample synthesis is carried out on a large ...

Embodiment 2

[0027] Sr 2 CuO 3 Precursor preparation and high-pressure synthesis of Sr 2 CuO 3+δ The procedure of the superconductor is the same as that of Example 1; except that x=0.3, the pressure is 7GPa, and the temperature is 900°C.

[0028] High pressure synthesized Sr 2 CuO 3+δ Low temperature heat treatment of superconductors

[0029] In a tube furnace, under an inert gas atmosphere (such as Ar gas), the high-pressure synthesized Sr 2 CuO3+δ The superconducting samples were heat-treated at 250 °C for 10 h.

Embodiment 3

[0031] Sr 2 CuO 3 Precursor preparation and high-pressure synthesis of Sr 2 CuO 3+δ The procedure of the superconductor is the same as in Example 1; except that x=0.7, the pressure is 5GPa, and the temperature is 1000°C.

[0032] High pressure synthesized Sr 2 CuO 3+δ Low temperature heat treatment of superconductors

[0033] In a tube furnace, under an inert gas atmosphere (such as N 2 ) the high pressure synthesized Sr 2 CuO 3+δ The superconducting samples were heat-treated at 300°C for 8 hours.

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Abstract

The invention relates to a novel method for increasing superconducting transition temperature Tc, in particular to a method for increasing the superconducting transition temperature Tc by using vertex angel oxygen in sequence. In the invention, a precursor method and a high temperature and high pressure method are used for synthesizing a high temperature superconductor of Sr2CuO3+Delta (Delta is more than zero and less than 1) with a single phase; the material refers to a p-typed high temperature superconductor with a single layer of CuO2 plane and a simple structure and the vertex angle oxygen partly occupied; the high temperature superconductor after synthesized under high temperature is treated thermally with the temperature of the thermal treatment of 50 DEG C to 500 DEG C and the time of the thermal treatment is 0.5 hour to 30 hours. The vertex angle is ordered, the Tc of Sr2CuO3+Delta after synthesized under high pressure increases from 30 to 75 K to 90 to 100 K after thermal treatment in low temperature. The method can be applicable to other systems and can be taken as a new path for developing a higher Tc superconducting material.

Description

technical field [0001] The present invention relates to a kind of Sr 2 CuO 3+δ Heat treatment methods for high temperature superconductors. Specifically, it relates to a method for Sr 2 CuO 3+δ The high-temperature superconducting crystal undergoes subsequent heat treatment to increase its high-temperature superconducting transition temperature T c Methods. Background technique [0002] In terms of lattice structure, high temperature superconductors are composed of CuO 2 The planar conductive layer and the charge storage layer are composed of two parts. By substituting or changing the oxygen content by asymmetric metal cations, the charge pool layer shifts towards CuO 2 The planes provide charge carriers (holes or electrons), giving rise to superconductivity. Doping carrier concentration, CuO in unit cell 2 The number of plane layers is to regulate the superconducting transition temperature T c available parameters. For example, for each copper oxide system, when ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/00H01B12/00C04B35/45C04B35/622
CPCY02E40/64Y02E40/60
Inventor 刘青清杨华杨留响余勇禹日成李凤英靳常青
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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