Effect of Firing Temperature on Microstructure and Superconductivity of YBCO Films Derived from Low-Fluorine Solution

Abstract:

Using a low-fluorine solution, YBa₂Cu₃O_7-x (YBCO) superconducting films were prepared on LaAlO₃ (LAO) substrates by dip-coating method. YBCO films were fired at different temperatures with same oxygen pressure of 1.3 vol% and water vapor pressure of 7.4 vol%. Effect of firing temperature on film microstructure and superconductivity was investigated. The results indicated that YBCO films with high-degree c-axis orientation (the degree of c-axis orientation reached 96%) can be obtained when heat treated at 800 °C. At this temperature YBCO films were grown on LAO with cubic-on-cubic mode, resulting in a high critical transition temperature (T_c) of 91.5 K, and critical current density (J_c) of lager than 1 MA/cm². However, when fired at lower temperatures, YBCO films trended to form a-axis grains, which degraded J_c of films. And a higher heat treatment temperature also depressed superconductivity of YBCO films.

• Periodical: Materials Science Forum (Volumes 745-746)
• Pages: 243-248
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.745-746.243
• Online since: February 2013
• Authors: Chuan Bao Wu, Gao Yang Zhao, Yuan Qing Chen
• Keywords: Critical Current Density, Orientation, Superconductor, YBa₂Cu₃O_7-x

References

[1] P. Malozemoff, S. Fleshler, M. Rupich, C. Thieme, X. Li, W. Zhang, A. Otto, J. Maguire, D. Folts, J. Yuan, H.P. Kraemer, W. Schmidt, M. Wohlfart, H.W. Neumueller, Progress in high temperature superconductor coated conductors and their applications, Supercond. Sci. Technol. 21 (2008).

DOI: 10.1088/0953-2048/21/3/034005

[2] T. Izumi, M. Yoshizumi, J. Matsuda, K. Nakaoka, Y. Kitoh, Y. Sutoh, T. Nakanishi, A. Nakai, K. Suzuki, Y. Yamada, A. Yajima, T. Saitoh, Y. Shiohara, Progress in development of advanced TFA-MOD process for coated conductors, Physica C: Superconductivity, 463-465 (2007).

DOI: 10.1016/j.physc.2007.04.240

[3] A. Gupta, R. Jagannathan, E.I. Cooper, E.A. Giess, J.I. Landman, B.W. Hussey, Superconducting oxide films with high transition temperature prepared from metal trifluoroacetate precursors, Appl. Phys. Lett. 52 (1988) 2077-(2079).

DOI: 10.1063/1.99752

[4] P.C. McIntyre, M.J. Cima, J.A. Smith Jr. R.B. Hallock, M.P. Siegal, J.M. Phillips, Effect of growth conditions on the properties and morphology of chemically derived epitaxial thin films of Ba2YCu3O7−x on (001) LaAlO3, J. Appl. Phys. 71 (1992).

DOI: 10.1063/1.351172

[5] H. Fuji, T. Honjo, R. Teranishi, Y. Tokunaga, J. Matsuda, S. Asada, Y. Yamada, T. Izumi, Y. Shiohara, Y. Iijima, S. Yasuhiro, K. Takashi, M. Atsushi, K. Murata, Processing for long YBCO coated conductors by advanced TFA-MOD process, Physica C: Superconductivity 412 (2004).

DOI: 10.1016/j.physc.2004.02.206

[6] Y. Chen, G. Zhao, L. Lei, X. Liu, High rate deposition of thick YBa2Cu3O7−x superconducting films using low-fluorine solution, Supercond. Sci. Technol. 20 (2007) 251-255.

DOI: 10.1088/0953-2048/20/3/024

[7] J. Lian, H. Yao, D. Shi, L. Wang, Y. Xu, Q. Liu, Z. Han, Structural characterization of epitaxial YBCO thin films prepared by a fluorine-free sol-gel method for coated conductors, Supercond. Sci. Technol. 16 (2003) 838-844.

DOI: 10.1088/0953-2048/16/8/302

[8] Y. Xu, A. Goyal, J. Lian, N. A. Rutter, D. Shi, S. Sathyamurthy, M. Paranthaman, L. Wang, P.M. Martin, D. M. Kroeger, Preparation of YBCO Films on CeO2-Buffered (001) YSZ Substrates by a Non-Fluorine MOD Method, J. Am. Ceram. Soc. 87 (2008).

DOI: 10.1111/j.1551-2916.2004.01669.x

[9] Y. Chen, F. Yan, G. Zhao, G. Qu, L. Lei, Fluorine-free sol-gel preparation of YBa2Cu3O7−x superconducting films by a direct annealing process J. Alloys Compd. 505 (2010) 640-644.

DOI: 10.1016/j.jallcom.2010.06.098

[10] N Roma, S Morlens, S Ricart, K Zalamova, J M Moreto, A Pomar, T Puig, X Obradors, Acid anhydrides: a simple route to highly pure organometallic solutions for superconducting films, Supercond. Sci. Technol. 19 (2006) 521-527.

DOI: 10.1088/0953-2048/19/6/019

[11] L. Lei, G. Zhao, H. Xu, N. Wu, Y. Chen, Influences of Y2O3 nanoparticle additions on the microstructure and superconductivity of YBCO films derived from low-fluorine solution, Mater. Chem. Phys. 127 (2011) 91-94.

DOI: 10.1016/j.matchemphys.2011.01.030

[12] G. Zhao, Li Lei, Xiaomei Liu, Yuanqing Chen, Effect of copper content in precursor solution on the superconducting properties of YBCO films derived from low-fluorine solution, Physica C: Superconductivity 468 (2008) 2317-2321.

DOI: 10.1016/j.physc.2008.08.007

[13] G. Zhao, Y. Chen, L. Lei, R. Xue, Fabrication of YBa2Cu3O7-x Superconducting Films Using Low-Fluorine-Content Solution, IEEE Trans. Appl. Supercond. 17 (2007) 40-43.

DOI: 10.1109/tasc.2006.887545

[14] C.J. Lu, Y. Qiao, Y.J. Qi, X.Q. Chen and J.S. Zhu, Large Anisotropy of Ferroelectric and Dielectric [] Properties for Bi3. 15Nd0. 85Ti3O12 Thin Films Deposited on Pt/Ti/SiO2/Si. Appl. Phys. Lett. 87 (2005) 2229011 (1-3).

DOI: 10.1063/1.2135386

[15] E.M. Gyorgy, R.B. van Dover, K.A. Jackson, L.F. Schneemeyer and J.V. Waszczak, Anisotropic critical currents in Ba2YCu3O7 analyzed using an extended Bean model, Appl. Phys. Lett. 55 (1989) 283-285.

DOI: 10.1063/1.102387