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A method for preparing c-axis ybco high temperature superconducting thick film with two kinds of a-axis grains
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A high-temperature superconductivity and grain technology, applied in chemical instruments and methods, single crystal growth, single crystal growth and other directions, can solve the problems of supersaturation state adjustment, the initial state of the solution cannot be fixed, etc., and achieves convenient operation and simple process. Effect
Inactive Publication Date: 2020-12-25
SHANGHAI JIAO TONG UNIV
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Problems solved by technology
[0006] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to provide a convenient and efficient method for growing a c-axis YBCO high-temperature superconducting thick film with two kinds of a-axis grains embedded on an NGO substrate, Overcame the inability to fix the initial state of the solution and the inability to adjust the supersaturation state of the solution to σ int2 and other problems
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Embodiment 1
[0036] This embodiment provides a method for preparing a c-axis YBCO high-temperature superconducting thick film with two kinds of a-axis grains, including the following steps:
[0037] 1. According to the ratio of Ba: Cu = 0.6, BaCO 3 Powder and CuO powder are mixed, put into a ball mill jar, add absolute ethanol or water for wet grinding to obtain BaCO 3 and CuO mixed slurry, the wet grinding time is 3 hours.
[0038] 2. The BaCO obtained in step 1 3 The mixed slurry with CuO was heated and dried at 105°C to obtain BaCO 3 and CuO mixed powder.
[0039] 3. The BaCO obtained in step 2 3 The mixed powder with CuO was sintered in the air at 900°C for 48 hours to obtain the precursor powder of Ba-Cu-O phase.
[0040] 4. Add the Ba-Cu-O precursor powder to the Y in the crystal growth furnace 2 o 3 In the crucible of the material, the Ba-Cu-O precursor powder was added to be flush with the upper edge of the crucible.
[0041] 5. Combine the Ba-Cu-O precursor powder from ste...
Embodiment 2
[0048] This embodiment provides a method for preparing a c-axis YBCO high-temperature superconducting thick film with two kinds of a-axis grains, including the following steps:
[0049] 1. According to the ratio of Ba: Cu = 0.6, BaCO 3 Powder and CuO powder are mixed, put into a ball mill jar, add absolute ethanol or water for wet grinding to obtain BaCO 3 and CuO mixed slurry, the wet grinding time is 4 hours.
[0050] 2. The BaCO obtained in step 1 3 The mixed slurry with CuO was heated and dried at 120°C to obtain BaCO 3 and CuO mixed powder.
[0051] 3. The BaCO obtained in step 2 3 The mixed powder with CuO was sintered in the air at 910°C for 50 hours to obtain the precursor powder of Ba-Cu-O phase.
[0052] 4. Add the Ba-Cu-O precursor powder to the Y in the crystal growth furnace 2 o 3 In the crucible of the material, the Ba-Cu-O precursor powder was added to be flush with the upper edge of the crucible.
[0053] 5. Combine the Ba-Cu-O precursor powder from ste...
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Abstract
The invention discloses a method for preparing c-axis YBCO (yttrium barium copper oxide) high-temperature superconducting thick films with two types of a-axis crystal grains. The method includes stepsof 1), proportioning and agglomerating BaCO3 powder and CuO powder to obtain Ba-Cu-O powder; 2), adding the Ba-Cu-O powder into Y2O3 crucibles, heating the Ba-Cu-O powder until the temperature of theBa-Cu-O powder reaches the high temperatures, adding Ba-Cu-O powder with the fixed weight into the Ba-Cu-O powder after the Ba-Cu-O powder is sufficiently melted, and preserving heat for a long termto obtain Y-Ba-Cu-O solution in constant initial states; 3), adding Ba-Cu-O powder with the fixed weight into high-temperature solution, changing the melting time delta<tm> of the Ba-Cu-O powder to regulate under-saturation and over-saturation intermediate states U<int> and allowing the solution to be in states U <int2>; 4), cooling the solution until the temperature of the solution reaches secondtemperatures; 5), implanting seed crystal materials into Y-Ba-Cu-O solution obtained at the step 4), and growing the seed crystal materials for 5-15 s. The seed crystal materials about to be implanted in the Y-Ba-Cu-O solution at the step 5) are fixed to connecting rods. The method has the advantages that the over-saturation of the solution can be finely regulated, accordingly, the Y-Ba-Cu-O solution can be accurately in specified over-saturation states in metastable regions, the c-axis YBCO high-temperature superconducting thick films with the two types of a-axis crystal grains can be obtained by the aid of the method by means of growing, and the method includes simple processes and is convenient to operate.
Description
technical field [0001] The present invention relates to a method for preparing a high-temperature superconducting material, in particular to a method for preparing a c-axis YBCO high-temperature superconducting thick film, and more particularly to a method for preparing a c-axis YBCO high-temperature superconducting film with two kinds of a-axis grains thick film method. Background technique [0002] Since the discovery of high-temperature superconductors, a large number of crystal workers have devoted themselves to the basic research and preparation of high-quality films. Thanks to YBa 2 Cu 3 o x (referred to as YBCO, Y123, Yttrium Barium Copper Oxygen) has a superconducting transition temperature Tc higher than the temperature of liquid nitrogen, and exhibits characteristics such as Meissner effect and zero resistance effect in a temperature environment lower than Tc. It is because of these important properties of YBCO high temperature superconducting materials that YB...
Claims
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