Method for preparing c-axis YBCO (yttrium barium copper oxide) high-temperature superconducting thick films with two types of a-axis crystal grains

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...

AI Technical Summary

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