Preparation method of gadolinium-barium-copper-oxygen compact film

A technology of gadolinium-barium-copper-oxygen dense film, which is applied in the field of preparation of gadolinium-barium-copper-oxygen dense film, can solve problems such as the reduction of superconducting performance, and achieve the effects of improved stability, easy operation, and rapid pyrolysis

Inactive Publication Date: 2012-12-05
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these studies also require precise control of the pyrolysis process and atmosphere, and at the same time, compared with GdBCO films prepared by using traditional trifluoroacetate precursors, the superconductivity of GdBCO films prepared by replacing precursors generally decreases.

Method used

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  • Preparation method of gadolinium-barium-copper-oxygen compact film

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Embodiment 1

[0026] The preparation method of the gadolinium-barium-copper-oxygen dense film of the present embodiment comprises the following steps:

[0027] Step 1, dissolving gadolinium trifluoroacetate, barium trifluoroacetate and copper trifluoroacetate in methanol to obtain trifluoroacetate precursor solution 1; gadolinium, barium and copper trifluoroacetate precursor solution 1 are The molar ratio of metal ions in the medium is: Gd 3+ : Ba 2+ : Cu 2+ =1:2:3, the total molar concentration of the three metal ions of gadolinium, barium and copper in the trifluoroacetate precursor solution 1 is 1.5mol / L;

[0028] Step 2. Add the chelating agent and the trifluoroacetic acid salt precursor described in step 1 into the agitator, stir at 60° C. for 3 hours at a speed of 400 r / min to form a complex, and then mix the complex compound in the mixed solution of methanol and propionic acid to obtain trifluoroacetate precursor solution two; The volume ratio of methanol and propionic acid in th...

Embodiment 2

[0033] The preparation method of the gadolinium-barium-copper-oxygen dense film of the present embodiment comprises the following steps:

[0034] Step 1, dissolving gadolinium trifluoroacetate, barium trifluoroacetate and copper trifluoroacetate in methanol to obtain trifluoroacetate precursor solution 1; gadolinium, barium and copper trifluoroacetate precursor solution 1 are The molar ratio of metal ions in the medium is: Gd 3+ : Ba 2+ : Cu 2+ =1:2:3, the total molar concentration of the three metal ions of gadolinium, barium and copper in the trifluoroacetate precursor solution 1 is 2mol / L;

[0035]Step 2. Add the chelating agent and the trifluoroacetate precursor solution 1 described in step 1 into the agitator, stir at a temperature of 70° C. for 2 hours at a speed of 500 r / min to form a complex, and then mix the complex compound in the mixed solution of methanol and propionic acid to obtain trifluoroacetate precursor solution two; The volume ratio of methanol and prop...

Embodiment 3

[0040] The preparation method of the gadolinium-barium-copper-oxygen dense film of the present embodiment comprises the following steps:

[0041] Step 1, dissolving gadolinium trifluoroacetate, barium trifluoroacetate and copper trifluoroacetate in methanol to obtain trifluoroacetate precursor solution 1; gadolinium, barium and copper trifluoroacetate precursor solution 1 are The molar ratio of metal ions in the medium is: Gd 3+ : Ba 2+ : Cu 2+ =1:2:3, the total molar concentration of the three metal ions of gadolinium, barium and copper in the trifluoroacetate precursor solution 1 is 2.5mol / L;

[0042] Step 2. Add the chelating agent and the trifluoroacetate precursor solution 1 described in step 1 into the agitator, stir at a temperature of 70° C. for 2 hours at a speed of 500 r / min to form a complex, and then mix the complex compound in the mixed solution of methanol and propionic acid to obtain trifluoroacetate precursor solution two; The volume ratio of methanol and p...

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Abstract

The invention discloses a preparation method of a gadolinium-barium-copper-oxygen compact film. The preparation method comprises the following steps of: dissolving gadolinium trifluoroacetate, barium trifluoroacetate and copper trifluoroacetate in methanol to obtain a first trifluoroacetate precursor solution; adding a chelating agent and the first trifluoroacetate precursor solution into an agitator, agitating and reacting to form a complex, and fixing the volume of the complex in a methanol and propanoic acid mixed solution to obtain a second trifluoroacetate precursor solution; uniformly coating the second trifluoroacetate precursor solution on a lanthanum aluminate monocrystalline substrate by adopting a spin-coating method, and then, placing the lanthanum aluminate monocrystalline substrate coated with a coating layer in a thermal decomposition furnace to carry out thermal decomposition to obtain a precursor film with a smooth surface; and placing the precursor film in a tube furnace to carry out crystallization treatment, dropping a temperature in the tube furnace to the temperature of oxygen diffusion treatment after the crystallization treatment to carry out the oxygen diffusion treatment, and cooling along with the furnace to obtain the gadolinium-barium-copper-oxygen compact film. The preparation method is simple in process and reasonable in design, and further, is easy to operate, and the gadolinium-barium-copper-oxygen compact film prepared by adopting the preparation method has the smooth surface, is flat and compact, and is excellent in performance.

Description

technical field [0001] The invention belongs to the technical field of high-temperature superconducting material preparation, and in particular relates to a preparation method of a gadolinium-barium-copper-oxygen dense film. Background technique [0002] Superconducting film GdBa in coated conductor 2 Cu 3 o y (GdBCO) has excellent superconducting properties, and its preparation technology is one of the current research hotspots. People have been able to use physical methods (pulse laser deposition technology) to prepare high-performance long strips of GdBCO superconducting layers, but the cost of equipment required for physical methods is relatively high, so many research units continue to develop low-cost chemical methods (chemical solution Deposition technology) to prepare GdBCO superconducting film. The traditional chemical method (trifluoroacetic acid metal organic deposition technology) can prepare high-performance GdBCO superconducting film, but it takes a long ti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/622C04B35/45
Inventor 金利华卢亚锋李成山于泽铭
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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