16.5 Conclusion
The recent progress on the development of LPE process for fabricating coated conductors was reviewed. In order to prevent the reaction between liquid and metal, it was clarified that the combination of MgO or NiO buffer layer and MgO- or NiO-saturated liquid are both effective. There is difference in the influence of buffer material-addition to liquid for growth of the 1st LPE layer. Although the MgO addition affect little to the Y-solubility and Tp of 123, NiO addition makes the able temperature range for Y123 growth decrease due to decrease of Tp and increase of crystallization temperature of the low temperature phase. Additionally, it was found that the suitable selection of RE for each layers to suppress dissolution of the 1st layer at dipping for the 2nd layer, which means stable growth of the 2nd layer. Consequently, the double layered LPE structure successfully realized on metal substrates, which reveal high superconducting performance. Then, the suitable constructions for the LPE coated conductors were confirmed as that lower growth temperature for the 2nd LPE layer should be selected than Tp of the 1st LPE layer material. Additionally, a higher Tp material than Y123 such as Nd- or Sm-system has to be selected for the 1st LPE layer in the NiO saturated system.
Next stage, the textured substrates such as the MgO deposited by using ISD technique or NiO fabricated by the SOE method will be applied to obtain high Jc and Ic. Furthermore, the process has to be extended to the long tape processing in parallel with improving Jc and Ic.
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Izumi, T., Shiohara, Y. (2005). LPE Processing for Coated Conductor. In: Goyal, A. (eds) Second-Generation HTS Conductors. Springer, Boston, MA. https://doi.org/10.1007/0-387-25839-6_16
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