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Preparation method of Nd1.85Ce0.15CuO4-detal superconducting target with preferred orientation

A nd1.85ce0.14cuo4- technology with preferential orientation, applied in the field of superconducting powder, can solve the problems of high energy consumption and inability to synthesize, and achieve the effect of reducing energy consumption and realizing preferential growth.

Inactive Publication Date: 2014-08-27
KUNMING UNIV OF SCI & TECH
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Problems solved by technology

The synthesis temperature of the final phase is 1150°C, which consumes a lot of energy and cannot synthesize Nd with preferred orientation. 2-x CaO 4-δ Ceramics, at the same time, because of the diffusion of Ce, the synthesized phase still has a certain amount of impurity

Method used

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  • Preparation method of Nd1.85Ce0.15CuO4-detal superconducting target with preferred orientation
  • Preparation method of Nd1.85Ce0.15CuO4-detal superconducting target with preferred orientation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0021] Implementation mode one: if figure 1 As shown, this embodiment has a preferred orientation of Nd 1.85 Ce 0.15 CuO 4-δ The preparation method of the superconducting target is as follows:

[0022] (1) Nd(NO 3 ) 3 ·nH 2 O, Ce(NO 3 ) 3 ·6H 2 O, Cu(NO 3 ) 2 ·3H 2 O and citric acid are weighed according to the molar ratio of Nd: Ce: Cu: EDTA being 1.85: 0.15: 1: 6;

[0023] (2) According to the liquid-solid ratio (L / Kg) of 20:1, put the citric acid prepared in step (1) in deionized water, citric acid solution;

[0024] (3) Add the Nd(NO 3 ) 3 ·nH 2 O, Ce(NO 3 ) 3 ·6H 2 O and Cu(NO 3 ) 2 ·3H 2 O, obtain mixed solution;

[0025] (4) Heat the mixture obtained in step (3) to reflux at 60°C for 4 hours to obtain a sol, then heat, evaporate and concentrate for 6 hours to obtain a gel, and dry the gel in an oven at 70°C under normal pressure to obtain a dry gel;

[0026] (5) Calcinate the xerogel obtained in step (4) at 700°C for 8 hours in an air atmosphere t...

Embodiment approach 2

[0029] Embodiment 2: This embodiment has Nd with preferred orientation 1.85 Ce 0.15 CuO 4-δ The preparation method of the superconducting target is as follows:

[0030] (1) Nd(NO 3 ) 3 ·nH 2 O, Ce(NO 3 ) 3 ·6H 2 O, Cu(NO 3 ) 2 ·3H 2 O and citric acid are prepared according to the molar ratio of Nd: Ce: Cu: EDTA of 1.85: 0.15: 1: 3;

[0031] (2) According to the liquid-solid ratio (L / Kg) of 5:1, prepare the citric acid prepared in step (1) into an aqueous solution;

[0032] (3) Add the Nd(NO 3 ) 3 ·nH 2 O, Ce(NO 3 ) 3 ·6H 2 O and Cu(NO 3 ) 2 ·3H 2 O, obtain mixed solution;

[0033] (4) Heat the mixed solution at 40°C to reflux to obtain a sol, then heat and evaporate to concentrate to obtain a gel, and dry the gel to obtain a xerogel; the time for heating and reflux is 4 hours, and the time for evaporation and concentration is 7 hours; the drying temperature is 150°C, the drying condition is normal pressure;

[0034] (5) Calcining the xerogel at 700°C to ...

Embodiment approach 3

[0036] Embodiment 3: This embodiment has the preferred orientation of Nd 1.85 Ce 0.15 CuO 4-δ The preparation method of the superconducting target is as follows:

[0037] (1) Nd(NO 3 ) 3 ·nH 2 O, Ce(NO 3 ) 3 ·6H 2 O, Cu(NO 3 ) 2 ·3H 2 O and citric acid are prepared according to the molar ratio of Nd: Ce: Cu: EDTA of 1.85: 0.15: 1: 10;

[0038] (2) According to the liquid-solid ratio (L / Kg) of 40:1, prepare the citric acid prepared in step (1) into an aqueous solution;

[0039] (3) Add the Nd(NO 3 ) 3 ·nH 2 O, Ce(NO 3 ) 3 ·6H 2 O and Cu(NO 3 ) 2 ·3H 2 O, obtain mixed solution;

[0040] (4) Heat the mixed solution to reflux at 70°C to obtain a sol, then heat, evaporate and concentrate to obtain a gel, and dry the gel to obtain a xerogel; the time for heating and reflux is 1 hour, and the time for evaporation and concentration is 3 hours; the drying temperature is 50°C, the drying condition is normal pressure;

[0041] (5) Calcining the xerogel at 700°C to ...

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Abstract

The invention relates to a preparation method of an Nd1.85Ce0.15CuO4-detal superconducting target with preferred orientation, and belongs to the technical field of superconducting powder. The preparation method comprises the following steps: weighing Nd(NO3)3.nH2O, Ce(NO3)3.6H2O, Cu(NO3)2.3H2O and nitric acid according to a molar ratio of Nd to Ce to Cu to the citric acid of1.85: 0.15: 1: x, wherein x is 3-10; firstly putting citric acid in the deionized water, then adding Nd(NO3)3.nH2O, Ce(NO3)3.6H2O and Cu(NO3)2.3H2O, carrying out heating reflux at the temperature of 40-70 DEG C so as to obtain sol, heating, evaporating and concentrating so as to obtain gel, drying the gel so as to obtain the dry gel, then calcining so as to obtain Nd[2-x]CexCuO4-delta superconducting nanometer porcelain powder, carrying out compression molding and sintering so as to obtain the target with the preferred orientation. The preparation method has the advantages that Nd, Ce and Cu are mixed at the atomic level in a sol-gel process, and a sintering schedule suitable for preferred growth is provided, so that the preparation of the Nd1.85Ce0.15CuO4-detal superconducting target with preferred orientation is realized at a low temperature, and the energy consumption is greatly reduced.

Description

technical field [0001] The present invention relates to a preferred orientation The invention discloses a preparation method of superconducting nano porcelain powder, which belongs to the technical field of superconducting powder. Background technique [0002] In 1986, the Swiss physicist A. Müller and the Federal German physicist G. Bednorz discovered the copper oxide La2-xBaxCuO with a zero-resistance transition temperature TC of 35K, thus creating a new era of research on high-temperature critical temperature superconductivity. With the extensive and in-depth development of research, new phenomena, new effects, new theories, new technologies, and new materials emerge in an endless stream in this high-temperature superconducting research field, which greatly promotes the rapid development of basic research and applied technology research. Copper oxide high temperature superconductivity has been further developed since electron or hole type doped copper-oxygen planes were...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/453C04B35/622
Inventor 张辉张斌陈清明李兵兵
Owner KUNMING UNIV OF SCI & TECH
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