TY - JOUR
T1 - Microstructural analysis on growth and crystallization mechanism of YBCO films deposited by advanced TFA-MOD process
AU - Matsuda, J.
AU - Nakaoka, K.
AU - Sutoh, Y.
AU - Nakanishi, T.
AU - Yoshizumi, M.
AU - Yamada, Y.
AU - Izumi, T.
AU - Shiohara, Y.
N1 - Funding Information:
This work was supported by the New Energy and Industrial Technology Development Organization (NEDO) as Collaborative Research and Development of Fundamental Technologies for Superconductivity Applications.
PY - 2007/10/1
Y1 - 2007/10/1
N2 - We have investigated effects of the heating rate in the crystallization process on Ic values and microstructures of YBa2Cu3O7-δ (YBCO) films, which were fabricated by the advanced metalorganic deposition (MOD) method using trifluoroacetates. As a result, it was found that the slow heating rate less than 2 °C/min in the crystallization process increases the volume of randomly oriented YBCO crystals, which results in a low Ic value of the YBCO film. TEM observations of quenched samples prepared by cooling rapidly during the crystallization process revealed that unreacted phase particles such as CuO, Y2Cu2O5 and Ba-O-F crystallize and coarsen to large crystals before the nucleation and growth of YBCO crystals in the case of slow heating. We conclude that it is important to control the size and distributions of the unreacted phase particles in the crystallization process, in order to fabricate the YBCO coated conductor with high Ic.
AB - We have investigated effects of the heating rate in the crystallization process on Ic values and microstructures of YBa2Cu3O7-δ (YBCO) films, which were fabricated by the advanced metalorganic deposition (MOD) method using trifluoroacetates. As a result, it was found that the slow heating rate less than 2 °C/min in the crystallization process increases the volume of randomly oriented YBCO crystals, which results in a low Ic value of the YBCO film. TEM observations of quenched samples prepared by cooling rapidly during the crystallization process revealed that unreacted phase particles such as CuO, Y2Cu2O5 and Ba-O-F crystallize and coarsen to large crystals before the nucleation and growth of YBCO crystals in the case of slow heating. We conclude that it is important to control the size and distributions of the unreacted phase particles in the crystallization process, in order to fabricate the YBCO coated conductor with high Ic.
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U2 - 10.1016/j.physc.2007.04.288
DO - 10.1016/j.physc.2007.04.288
M3 - Article
AN - SCOPUS:34548387570
SN - 0921-4534
VL - 463-465
SP - 712
EP - 716
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
IS - SUPPL.
ER -