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A low-temperature preparation method of nd2-xcexcuo4-delta superconducting nano ceramic powder

A nano-porcelain and superconducting technology is applied in the field of preparation of Nd1.85Ce0.15CuO4-δ superconducting nano-porcelain, which can solve the problems of consumption, inability to synthesize nano-powder, large energy, etc., and achieve the effect of reducing energy consumption

Active Publication Date: 2015-09-30
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 nano-powders. At the same time, due to the diffusion of Ce, the synthesized phase still has certain impurities.

Method used

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  • A low-temperature preparation method of nd2-xcexcuo4-delta superconducting nano ceramic powder
  • A low-temperature preparation method of nd2-xcexcuo4-delta superconducting nano ceramic powder
  • A low-temperature preparation method of nd2-xcexcuo4-delta superconducting nano ceramic powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Nd(NO 3 ) 3 ·nH 2 O, Cu(NO 3 ) 2 ·3H 2 O and EDTA (ethylenediaminetetraacetic acid) are weighed according to the molar ratio of Nd:Ce:Cu:EDTA is 2:1:3;

[0026] (2) According to the liquid-solid ratio (L / Kg) of 5:1, place the EDTA prepared in step (1) in deionized water, and add ethylenediamine at the same time to adjust the pH value to 4 to obtain a mixed solution;

[0027] (3) Add the Nd(NO 3 ) 3 ·nH 2 O and Cu(NO 3 ) 2 ·3H 2 0, while adding ethylenediamine to adjust the pH value to be 8, to obtain a mixture;

[0028] (4) Heat the mixture obtained in step (3) to reflux at 60°C for 1 hour to obtain a sol, then heat, evaporate and concentrate for 7 hours to obtain a gel, and dry the gel in an oven at 120°C under normal pressure to obtain a dry gel;

[0029] (5) Calcining the xerogel obtained in step (4) at 600°C for 8 hours in an air atmosphere to obtain Nd 2 CuO 4-δ Superconducting nano ceramic powder.

Embodiment 2

[0031] (1) Nd(NO 3 ) 3 ·nH 2 O, Ce(NO 3 ) 3 ·6H 2 O, Cu(NO 3 ) 2 ·3H 2 O and EDTA (ethylenediaminetetraacetic acid) are weighed according to the molar ratio of Nd:Ce:Cu:EDTA is 1.85:0.15:1:3;

[0032] (2) According to the liquid-solid ratio (L / Kg) of 20:1, place the EDTA prepared in step (1) in deionized water, and add ethylenediamine at the same time to adjust the pH value to 6 to obtain a mixed solution;

[0033] (3) Add the Nd(NO 3 ) 3 ·nH 2 O, Ce(NO 3 ) 3 ·6H 2 O and Cu(NO 3 ) 2 ·3H 2 0, while adding ethylenediamine to adjust the pH value to 6, to obtain a mixture;

[0034] (4) Heat the mixture obtained in step (3) to reflux at 75°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 90°C under normal pressure to obtain a dry gel;

[0035] (5) Calcinate the xerogel obtained in step (4) at 700°C for 8 hours in an air atmosphere to obtain Nd 1.85 Ce 0.15 CuO 4-δ Superconducting nano...

Embodiment 3

[0037] (1) Nd(NO 3 ) 3 ·nH 2 O, Ce(NO 3 ) 3 ·6H 2 O, Cu(NO 3 ) 2 ·3H 2 O and EDTA (ethylenediaminetetraacetic acid) are weighed according to the molar ratio of Nd:Ce:Cu:EDTA is 1.83:0.17:1:3;

[0038] (2) According to the liquid-solid ratio (L / Kg) of 40:1, place the EDTA prepared in step (1) in deionized water, and add ethylenediamine at the same time to adjust the pH value to 8 to obtain a mixed 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 0, while adding ethylenediamine to adjust the pH value to 10, to obtain a mixture;

[0040] (4) Heat the mixture obtained in step (3) to reflux at 80°C for 2 hours to obtain a sol, then heat, evaporate and concentrate for 3 hours to obtain a gel, and dry the gel in an oven at 70-150°C under normal pressure to obtain a dry gel;

[0041] (5) Calcining the xerogel obtained in step (4) at 600°C for 16 hours in an air atmosphere to obtain Nd 1.83 Ce 0.17 CuO 4-δ Superconductin...

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Abstract

The invention provides a low-temperature preparation method for Nd2-xCexCuO4-delta superconductive nano porcelain powder. The method comprises the following steps: weighing Nd(NO3)3.nH2O, Ce(NO3)3.6H2O, Cu(NO3)2.3H2O and EDTA (ethylene diamine tetraacetic acid) according to the Nd-to-Ce-to-Cu-to-EDTA molar ratio of (2-x) to x to 1 to 3, wherein x is 0-0.17; putting EDTA in de-ionized water while adding ethanediamine for adjusting the pH value, adding Nd(NO3)3.nH2O, Ce(NO3)3.6H2O and Cu(NO3)2.3H2O while adding ethanediamine for adjusting the pH value, performing heating reflux at the temperature of 60-80 DEG C to obtain sol, heating, evaporating and concentrating to obtain gel, drying the gel to obtain dry gel, and calcining to obtain the Nd2-xCexCuO4-delta superconductive nano porcelain powder with the particle size of 20-70 nm. According to the method, Nd, Ce and Cu are atomically mixed by a sol-gel process, so that the low-temperature synthesis of the pure-phase nano Nd2-xCexCuO4-delta superconductive porcelain powder is achieved and the energy consumption is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of superconducting powder, and relates to a kind of Nd 1.85 Ce 0.15 CuO 4-δ The preparation method of superconducting nano ceramic powder. Background technique [0002] In 1986, Swiss physicist A. Müller and Federal German physicist G. Bednorz discovered the zero resistance transition temperature T C 35K copper oxide La 2-x Ba x CuO, 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 discovered in the copper oxide h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/50C04B35/626
Inventor 陈清明张斌张辉
Owner KUNMING UNIV OF SCI & TECH
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