CN103280520A - Preparation method of YBCO (yttrium barium copper oxide) superconductivity composite film - Google Patents
Preparation method of YBCO (yttrium barium copper oxide) superconductivity composite film Download PDFInfo
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Abstract
The invention relates to a preparation method of a YBa2Cu3O(7-x) superconductivity composite film. According to the preparation method, firstly, precursor liquid is prepared, i.e. Sm(CH3COO)3, Y(CH3COO)3, Ba(CH3COO)2 and Cu(CH3COO)2 are mixed and dissolved in 10-30 mol percent trifluoroacetic acid water solution according to the mol ratio that Sm:Y:Ba:Cu is (0.05-0.1):1:2:3; the mixed solution is uniformly stirred, then, solvents are dried through evaporation in a vacuum way, and gel is obtained; then, methyl alcohol is added and is uniformly stirred, then, the solvents are dried through evaporation, and gel is obtained; next, a proper amount of methyl alcohol and terpilenol are added, solution with the four-metal (Sm, Y, Ba and Cu) ion total concentration being 1.5 to 3.0mol/L is prepared, and the precursor liquid is prepared; then, the precursor liquid is coated on a substrate; the coated film is firstly subjected to 300 DEG C-500 DEG C low-temperature heat treatment process, and trifluoroacetic acid salts are decomposed; and finally, 800 DEG C-900 DEG C high-temperature heat treatment and 450 DEG C-550 DEG C annealing process are carried out, and the YBa2Cu3O(7-x) (YBCO ) superconductivity composite film containing nanometer samarium oxide is formed. The critical current density of the YBCO film prepared by the preparation method reaches 6MA/cm<2>(77k, 0T).
Description
Technical field
The present invention relates to a kind of preparation method of second generation belt material of high temperature superconduct superconducting layer, particularly a kind of preparation method of YBCO superconduction laminated film.
Background technology
Second generation belt material of high temperature superconduct refers to the terres rares barium-copper oxide superconducting coating conductor based on the YBCO-123 series superconducting material.It is made of metal alloy base band, Seed Layer, barrier layer, cap layer, rare earth barium copper oxide superconducting layer, protective layer and stabilized zone etc., is a kind of sandwich construction.Compare with first generation Bi based high-temperature superconductive strip, second generation belt material of high temperature superconduct has the ability of the high electric current of load under the highfield, can under higher temperature and magnetic field, use, and be the focus that various countries competitively research and develop in the high-temperature superconductor field.
YBCO can use in the forceful electric power field as coating conductor, mainly be since it have can load current and the characteristic of not loss.Concerning same band, the critical current density (Jc) that increases it has also just improved its current capacity.Therefore the critical current density that improves the YBCO superconducting film is research focus in recent years.
The people such as J.L.MacManus-Driscoll of U.S. Los Alamos National Laboratories and Cambridge University then directly mix zirconia and excessive barium dust in the YBCO ceramic target, adopt the PLD method to obtain containing the BaZrO that is of a size of 10nm according to the process conditions of preparation ybco film
3(BZO) laminated film of particle.Its critical current density all is higher than the critical current density of pure ybco film at whole externally-applied magnetic field, and especially when externally-applied magnetic field was 7T, its critical current density was five times of pure ybco film.Barcelona, ESP university 2007 has reported at Nature materials that employing trifluoroacetate-metal organic deposit method (TFA-MOD method) has prepared contains nanometer BaZrO
3Ybco film.Its critical current density has not only had large increase than the pure ybco film of TFA-MOD method preparation, and its pining force to be issued to maximum in the condition of 77K, externally-applied magnetic field 2T be 21GN m
-3, improved 175% than the BZO/YBCO nano compound film of PLD method preparation, improved 60% than the performance at the NiTb of 4.2K alloy.The preparation method that the present domestic patent overwhelming majority about the YBCO superconducting film is ybco film has only Chinese patent CN101320604A to propose to add SrZrO in the YBCO superconducting film
3Improve the effect of its critical current density.This patent has obtained doping SrZrO by interpolation strontium acetate and acetylacetone,2,4-pentanedione zirconium in precursor liquid
3Ybco film, but doping SrZrO
3The ybco film critical current density compare and improve little with pure YBCO film.
Summary of the invention
The objective of the invention is to overcome the existing prepared more weak shortcoming of YBCO superconducting thin film current capacity, propose the method that a kind of preparation has the YBCO laminated film of high current carrying capacity.
The present invention contains the ybco film of nano oxidized samarium by adopting trifluoroacetate-metal organic deposit method preparation, the present invention adds terpinol in the precursor liquid that contains trifluoroacetic acid samarium, trifluoroacetic acid yttrium, trifluoroacetic acid barium and trifluoroacetic acid copper, concentration by the control metal ion, after through low temperature thermal decomposition and high temperature sintering, prepare the YBCO superconducting thin film that contains nano oxidized samarium, utilized nano oxidized samarium to improve the flux pinning effect of ybco film.
Concrete steps order of the present invention is as follows:
(1) according to the mol ratio of Sm:Y:Ba:Cu=0.05～0.1:1:2:3 Sm (CH
3COO)
3, Y (CH
3COO)
3, Ba (CH
3COO)
2And Cu (CH
3COO)
2Four kinds of powder are dissolved under room temperature in the deionized water of the trifluoroacetic acid that contains 10-30mol%, wiring solution-forming, and the mol ratio of solute and solvent is 1:100 in the described solution;
(2) the described solution that step (1) is prepared adopts Rotary Evaporators to steam to desolventize then and obtains gel through magnetic stirrer 1-3h;
(3) gel that described step (2) is made adds in the methyl alcohol, and the gel in this step and the mol ratio of methyl alcohol are 1:50; Behind magnetic stirrer 0.5-1.5h, adopt Rotary Evaporators to steam again and desolventize, with impurity such as further removal moisture, obtain pure gel;
(4) gel that described step (3) is made joins in methyl alcohol and the terpinol, the solution that to make Sm, Y, Ba and four kinds of metal total ion concentrations of Cu be 1.5-3.0mol/L, the volume ratio of described methyl alcohol and terpinol is 1:1, the solution that will contain described Y, Ba and Cu stirs, and is prepared into precursor liquid;
(5) precursor liquid of described step (4) being made adopts spin coating or method of pulling up to be coated on the substrate;
(6) substrate after step (5) applies is placed the quartzy stove of high-temperature tubular, under 300 ℃ of-500 ℃ of temperature, carry out the Low Temperature Heat Treatment of 10h, decompose trifluoroacetate; The heating rate of this step is 40 ℃/h;
(7) will place heat treatment 2-4h under 800 ℃～-900 ℃ the high temperature through the substrate that described step (6) is handled, generate the cubic phase YBCO film that contains nano oxidized samarium; The programming rate of this step is 400 ℃/h;
(8) will place through the substrate that step (7) is handled under 450 ℃-550 ℃ and the pure oxygen condition the film heat treatment 0.5-1.5h that anneals, be prepared into the YBCO superconducting thin film that contains nano oxidized samarium.
Substrate described in the step (5) is lanthanum aluminate, strontium titanates or magnesium oxide single-crystal substrate.
Compared with prior art, the present invention has following beneficial effect:
The present invention adds acetic acid samarium and terpinol in the precursor liquid that contains trifluoroacetic acid yttrium, trifluoroacetic acid barium and trifluoroacetic acid copper.By the concentration of control metal ion, after through low temperature thermal decomposition and high temperature sintering, prepared the YBCO superconducting thin film that contains nano oxidized samarium.These samarium oxides with nano-scale have well played the effect of flux pinning, and adopting the ybco film critical current density of this method preparation is at null field or at High-Field raising to be arranged all, reaches 6MA/cm in null field lower critical current density
2, improved the current capacity of ybco film greatly, reduced the production cost of coating conductor, widened the range of application of YBCO coating conductor.
Description of drawings
The field emission scanning electron microscope picture of the YBCO film of Fig. 1 embodiment 1 preparation;
The X-ray diffraction picture of the YBCO film of Fig. 2 embodiment 1 preparation;
The field emission scanning electron microscope picture of the YBCO film of Fig. 3 embodiment 2 preparations;
Fig. 4. the X-ray diffraction picture of the YBCO film of embodiment 2 preparations;
The critical current density picture of the YBCO film of Fig. 5 embodiment 2 preparations;
The field emission scanning electron microscope picture of the YBCO film of Fig. 6 embodiment 3 preparations;
The field emission scanning electron microscope picture of the YBCO film of Fig. 7 embodiment 4 preparations.
Embodiment
Embodiment 1
(1) takes by weighing acetic acid samarium, yttrium acetate, barium acetate and copper acetate and be respectively 0.00025mol, 0.005mol, 0.01mol and 0.015mol, be dissolved in wiring solution-forming in the 54.45ml deionized water of the trifluoroacetic acid that contains 10mol% after acetic acid samarium, yttrium acetate, barium acetate and copper acetate are mixed;
(2) solution that step (1) is made adopts Rotary Evaporators to steam to desolventize again and obtains gel behind magnetic stirrer 1h;
(3) methyl alcohol of 1.55mol is added in the gel that described step (2) makes, behind magnetic stirrer 0.5h, adopt Rotary Evaporators to steam again again to desolventize with impurity such as further removal moisture to obtain very pure gel;
(4) gel that step (3) is made joins in the mixed liquor of 10.05ml methyl alcohol and 10.05ml terpinol, and the volume ratio of described methyl alcohol and terpinol is 1:1, the solution that to make Sm, Y, Ba and four kinds of metal total ion concentrations of Cu be 1.5mol/L.The methyl alcohol that contains Sm, Y, Ba and Cu and the terpineol solution of gained are stirred, be prepared into precursor liquid;
(5) precursor liquid that step (4) is made is spin-coated on the strontium titanate monocrystal chip with 1500 rev/mins speed, and the spin coating time is 90s.
(6) the coated substrate of step (5) that coating is good is placed on to send in the quartz boat in the quartzy stove of high-temperature tubular and carries out Low Temperature Heat Treatment and high-temperature heat treatment, obtains containing the YBCO high temperature superconducting film of nano oxidized samarium at last.
Low Temperature Heat Treatment is to carry out under the moistening oxygen condition, be through the vial that distilled water is housed steam to be brought the oxygen of 500sccm into reative cell, make that water vapour pressure is 100hPa in the reative cell, on average be warming up to 300 ℃ with the heating rate of 40 ℃/h from room temperature, and then stove is cooled to room temperature.The purpose of Low Temperature Heat Treatment is to decompose trifluoroacetate, forms unformed precursor film and discharges harmful residual substance.The whole resolving time is about 10h.
High-temperature heat treatment is to carry out under moistening oxygen and argon gas mixed atmosphere, the argon gas mist that 500sccm is contained 500ppm oxygen is brought steam into reative cell through the vial that distilled water is housed, make that water vapour pressure is 160hPa in the reative cell, heating rate with 400 ℃/h rose to 800 ℃ of the highest temperatures before this, behind 800 ℃ of insulation 2h, directly feed the argon gas mist that contains 500ppm oxygen, be cooled to 450 ℃ with 100 ℃/h then, insulation 0.5h makes the YBCO oxygen uptake of cubic phase change the ybco film with superconductivity of quadrature phase in 450 ℃ purity oxygen atmosphere, and sample stove under the oxygen atmosphere is chilled to room temperature subsequently.With field emission scanning electron microscope sample has been carried out the surface topography observation, the surfacing of ybco film film, densification; And film surface is obviously found out nano particle, as shown in Figure 1.Adopt X-ray diffractometer that sample has been carried out analysis of components.Except YBCO (00l) diffraction maximum is arranged, also have some more weak diffraction maximums in addition in the sample.Through the retrieval of JCPDS card, (313) diffraction maximum of the corresponding samarium oxide of diffraction maximum that intensity is more weak illustrates in the prepared ybco film and contains samarium oxide, as shown in Figure 2.
(1) takes by weighing acetic acid samarium, yttrium acetate, barium acetate and copper acetate and be respectively 0.0075mol, 0.01mol, 0.02mol and 0.03mol, be dissolved in wiring solution-forming in the 121.5ml deionized water of the trifluoroacetic acid that contains 20mol% after acetic acid samarium, yttrium acetate, barium acetate and copper acetate are mixed;
(2) the described solution that step (1) is made adopts Rotary Evaporators to steam to desolventize again and obtains gel behind magnetic stirrer 2h;
(3) 3.175mol methyl alcohol is joined in the gel that step (2) makes, behind magnetic stirrer 1h, adopt Rotary Evaporators to steam again again to desolventize with impurity such as further removal moisture to obtain very pure gel;
(4) gel that step (3) is made joins in the mixed liquor of 16.88ml methyl alcohol and 16.88ml terpinol, and the volume ratio of described methyl alcohol and terpinol is 1:1, the solution that to make Sm, Y, Ba and four kinds of metal total ion concentrations of Cu be 2.0mol/L.The methyl alcohol that contains Sm, Y, Ba and Cu and the terpineol solution of gained are stirred, be prepared into precursor liquid;
(5) precursor liquid that step (4) is made is spin-coated on the lanthanuma luminate single crystal substrate with 1500 rev/mins speed, and the spin coating time is 90s.
(6) substrate that coating is good is placed on to send in the quartz boat in the quartzy stove of tubular type and carries out Low Temperature Heat Treatment and high-temperature heat treatment, obtains containing the YBCO high temperature superconducting film of nano oxidized samarium at last.
Low Temperature Heat Treatment is to carry out under the moistening oxygen condition, be through the vial that distilled water is housed steam to be brought the oxygen of 500sccm into reative cell, make that water vapour pressure is 180hPa in the reative cell, on average be warming up to 400 ℃ with the heating rate of 40 ℃/h from room temperature, and then stove is cooled to room temperature.The purpose of Low Temperature Heat Treatment is to decompose trifluoroacetate, forms unformed precursor film and discharges harmful residual substance.The whole resolving time is about 10h.
High-temperature heat treatment is to carry out under moistening oxygen and argon gas mixed atmosphere, the argon gas mist that 500sccm is contained 500ppm oxygen is brought steam into reative cell through the vial that distilled water is housed, make that water vapour pressure is 275hPa in the reative cell, heating rate with 400 ℃/h rose to 850 ℃ of the highest temperatures before this, behind 850 ℃ of insulation 3h, directly feed the argon gas mist that contains 500ppm oxygen, be cooled to 500 ℃ with 100 ℃/h then, insulation 1h makes the YBCO oxygen uptake of cubic phase change the YBCO with superconductivity of quadrature phase in 500 ℃ purity oxygen atmosphere, and sample stove under the oxygen atmosphere is chilled to room temperature subsequently.
With field emission scanning electron microscope sample has been carried out the surface topography observation, the surfacing of ybco film film, densification; And film surface is obviously found out nano particle, as shown in Figure 3.With X-ray diffractometer sample has been carried out analysis of components.Except YBCO (00l) diffraction maximum is arranged, also have some more weak diffraction maximums in addition in the sample.Through the retrieval of JCPDS card, (313) and (313) diffraction maximum of the corresponding samarium oxide of diffraction maximum difference that these intensity are more weak illustrates in the prepared ybco film and contains samarium oxide, as shown in Figure 4.
Adopt the Jc-scan system that sample has been carried out the critical current density test, the sample critical current density is 6.3MA/cm
2, be higher than pure ybco film, as shown in Figure 4.
Embodiment 3
(1) takes by weighing acetic acid samarium, yttrium acetate, barium acetate and copper acetate and be respectively 0.0015mol, 0.015mol, 0.03mol and 0.045mol, be dissolved in wiring solution-forming in the 164.7ml deionized water of the trifluoroacetic acid that contains 30mol% after acetic acid samarium, yttrium acetate, barium acetate and copper acetate are mixed;
(2) solution that step (1) is made adopts Rotary Evaporators to steam to desolventize again and obtains gel behind magnetic stirrer 3h;
(3) methyl alcohol of 4.875mol is joined in the gel that step (2) makes, behind magnetic stirrer 1.5h, adopt Rotary Evaporators to steam again again to desolventize with impurity such as further removal moisture to obtain very pure gel;
(4) gel that step (3) is made joins in the mixed liquor of 15.25ml methyl alcohol and 15.25ml terpinol, and the volume ratio of described methyl alcohol and terpinol is 1:1, and making Sm, Y, Ba and Cu four metal ion species concentration is the solution of 3.0mol/L.The methyl alcohol that contains Sm, Y, Ba and Cu and the terpineol solution of gained are stirred, be prepared into precursor liquid;
(5) speed of above-mentioned precursor liquid with 1500 rev/mins is spin-coated on the lanthanuma luminate single crystal matrix, the spin coating time is 90s.
(6) sample that coating is good is placed on to send in the quartz boat in the quartzy stove of tubular type and carries out Low Temperature Heat Treatment and high-temperature heat treatment, obtains containing the YBCO high temperature superconducting film of yittrium oxide and nanometer barium zirconate at last.Low Temperature Heat Treatment is to carry out under the moistening oxygen condition, be through the vial that distilled water is housed steam to be brought the oxygen of 500sccm into reative cell, make that water vapour pressure is 200hPa in the reative cell, on average be warming up to 500 ℃ with the heating rate of 40 ℃/h from room temperature, and then stove is chilled to room temperature.The purpose of Low Temperature Heat Treatment is to decompose trifluoroacetate, forms unformed precursor film and discharges harmful residual substance.The whole resolving time is about 10h.
High-temperature heat treatment is to carry out under moistening oxygen and argon gas mixed atmosphere, the argon gas mist that 500sccm is contained 500ppm oxygen is brought steam into reative cell through the vial that distilled water is housed, make that water vapour pressure is 300hPa in the reative cell, heating rate with 400 ℃/h rose to 900 ℃ of the highest temperatures before this, behind 900 ℃ of insulation 4h, directly feed the argon gas mist that contains 500ppm oxygen, be cooled to 550 ℃ with 100 ℃/h then, insulation 1.5h makes the YBCO oxygen uptake of cubic phase change the YBCO with superconductivity of quadrature phase in 550 ℃ purity oxygen atmosphere, and sample stove under the oxygen atmosphere is cooled to room temperature subsequently.
With field emission scanning electron microscope sample has been carried out the surface topography observation, the surfacing of ybco film film, densification; And film surface is obviously found out nano particle, as shown in Figure 5.
Embodiment 4
(1) takes by weighing acetic acid samarium, yttrium acetate, barium acetate and copper acetate and be respectively 0.0075mol, 0.01mol, 0.02mol and 0.03mol, be dissolved in wiring solution-forming in the 121.5ml deionized water of the trifluoroacetic acid that contains 20mol% after acetic acid samarium, yttrium acetate, barium acetate and copper acetate are mixed;
(2) the described solution that step (1) is made adopts Rotary Evaporators to steam to desolventize again and obtains gel behind magnetic stirrer 2h;
(3) 3.175mol methyl alcohol is joined in the gel that step (2) makes, behind magnetic stirrer 1h, adopt Rotary Evaporators to steam again again to desolventize with impurity such as further removal moisture to obtain very pure gel;
(4) gel that step (3) is made joins in the mixed liquor of 16.88ml methyl alcohol and 16.88ml terpinol, and the volume ratio of described methyl alcohol and terpinol is 1:1, the solution that to make Sm, Y, Ba and four kinds of metal total ion concentrations of Cu be 2.0mol/L.The methyl alcohol that contains Sm, Y, Ba and Cu and the terpineol solution of gained are stirred, be prepared into precursor liquid;
(5) precursor liquid that step (4) is made is coated on the magnesium oxide single-crystal substrate with 5 millimeters/minute pull rate.
(6) substrate that coating is good is placed on to send in the quartz boat in the quartzy stove of tubular type and carries out Low Temperature Heat Treatment and high-temperature heat treatment, obtains containing the YBCO high temperature superconducting film of nano oxidized samarium at last.
Low Temperature Heat Treatment is to carry out under the moistening oxygen condition, be through the vial that distilled water is housed steam to be brought the oxygen of 500sccm into reative cell, make that water vapour pressure is 180hPa in the reative cell, on average be warming up to 400 ℃ with the heating rate of 40 ℃/h from room temperature, and then stove is cooled to room temperature.The purpose of Low Temperature Heat Treatment is to decompose trifluoroacetate, forms unformed precursor film and discharges harmful residual substance.The whole resolving time is about 10h.
High-temperature heat treatment is to carry out under moistening oxygen and argon gas mixed atmosphere, the argon gas mist that 500sccm is contained 500ppm oxygen is brought steam into reative cell through the vial that distilled water is housed, make that water vapour pressure is 275hPa in the reative cell, heating rate with 400 ℃/h rose to 850 ℃ of the highest temperatures before this, behind 850 ℃ of insulation 3h, directly feed the argon gas mist that contains 500ppm oxygen, be cooled to 500 ℃ with 100 ℃/h then, insulation 1h makes the YBCO oxygen uptake of cubic phase change the YBCO with superconductivity of quadrature phase in 500 ℃ purity oxygen atmosphere, and sample stove under the oxygen atmosphere is chilled to room temperature subsequently.
With field emission scanning electron microscope sample has been carried out the surface topography observation, the surfacing of ybco film film, densification; And film surface is obviously found out nano particle, as shown in Figure 5.
Claims (3)
1. the preparation method of a YBCO superconduction laminated film is characterized in that, described preparation method is: add methyl alcohol and terpinol in the precursor liquid that contains trifluoroacetic acid samarium, trifluoroacetic acid yttrium, trifluoroacetic acid barium and trifluoroacetic acid copper; By the concentration of control metal ion, through low temperature thermal decomposition and high temperature sintering, preparation contains the YBCO superconducting thin film of nano oxidized samarium, utilizes nano oxidized samarium to improve the flux pinning effect of ybco film.
2. the preparation method of a YBCO superconduction laminated film is characterized in that, described preparation method comprises the steps:
(1) according to the mol ratio of Sm:Y:Ba:Cu=0.05～0.1:1:2:3 Sm (CH
3COO)
3, Y (CH
3COO)
3, Ba (CH
3COO)
2And Cu (CH
3COO)
2Mix, be dissolved under room temperature in the deionized water of the trifluoroacetic acid that contains 10-30mol%, be made into the solution of trifluoroacetate, the mol ratio of solute and solvent is 1:100 in the described trifluoroacetic acid salting liquid;
(2) the trifluoroacetic acid salting liquid that step (1) is prepared adopts Rotary Evaporators to steam to desolventize again and obtains gel through magnetic stirrer 1-3h;
(3) gel that described step (2) is made adds in the methyl alcohol, gel in this step and the mol ratio of methyl alcohol are 1:50, behind magnetic stirrer 0.5-1.5h, adopt Rotary Evaporators to steam again and desolventize, with impurity such as further removal moisture, obtain pure gel;
(4) gel that described step (3) is made joins in methyl alcohol and the terpinol, the solution that to make Sm, Y, Ba and four kinds of metal total ion concentrations of Cu be 1.5-3.0mol/L, and the volume ratio of described methyl alcohol and terpinol is 1:1; The solution that will contain described Sm, Y, Ba and Cu stirs, and is prepared into precursor liquid;
(5) the described precursor liquid of above-mentioned steps (4) being made adopts spin coating or method of pulling up to be coated on the substrate;
(6) substrate after step (5) applies is placed the quartzy stove of high-temperature tubular, under 300 ℃ of-500 ℃ of temperature, carry out the Low Temperature Heat Treatment of 10h, decompose trifluoroacetate; The heating rate of this step is 40 ℃/h;
(7) will place heat treatment 2-4h under 8000 ℃-900 ℃ the high temperature through the substrate that step (6) is handled, generate the cubic phase YBCO film that contains nano oxidized samarium; The programming rate of this step is 400 ℃/h;
(8) will place through the substrate that step (7) is handled under 450 ℃-550 ℃ and the pure oxygen condition the film heat treatment 0.5-1.5h that anneals, be prepared into the YBCO superconducting thin film that contains nano oxidized samarium.
3. the preparation method of a kind of ybco film superconductivity as claimed in claim 2 is characterized in that, substrate described in the described step (5) is lanthanum aluminate, strontium titanates or magnesium oxide single-crystal substrate.
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|---|---|---|---|---|
| CN102491740A (en) * | 2011-11-28 | 2012-06-13 | 西北有色金属研究院 | Yttrium barium copper oxide superconducting thin film mixed with samarium and manufacture method thereof |
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| CN102491740A (en) * | 2011-11-28 | 2012-06-13 | 西北有色金属研究院 | Yttrium barium copper oxide superconducting thin film mixed with samarium and manufacture method thereof |
Non-Patent Citations (2)
| Title |
|---|
| SANSHENG WANG等: ""High quality YBCO film growth on SrTiO3-buffered LaAlO3 substrate by full solution method"", 《JOURNAL OR MATERIAL SCIENCE AND TECHNOLOGY》, vol. 24, no. 6, 31 December 2008 (2008-12-31), pages 899 - 902 * |
| 丁发柱等: "YBa2Cu3O7-x高温超导涂层导体磁通钉扎的研究进展", 《中国稀土学报》, vol. 26, no. 5, 31 October 2008 (2008-10-31), pages 613 - 623 * |
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