Metalorganic Deposition of YBCO Films for Second-Generation High-Temperature Superconductor Wires
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osition of YBCO Films for SecondGeneration High Temperature Superconductor Wires Martin W. Rupich, Darren T. Verebelyi, Wei Zhang, Thomas Kodenkandath and Xiaoping Li MRS Bulletin / Volume 29 / Issue 08 / August 2004, pp 572 578 Copyright © Materials Research Society 2004 Published online by Cambridge University Press: January 2011 DOI: 10.1557/mrs2004.163
Link to this article: http://journals.cambridge.org/abstract_S0883769400016043 How to cite this article: Martin W. Rupich, Darren T. Verebelyi, Wei Zhang, Thomas Kodenkandath and Xiaoping Li (2004). Metalorganic Deposition of YBCO Films for SecondGeneration HighTemperature Superconductor Wires. MRS Bulletin,29, pp 572578 doi:10.1557/ mrs2004.163 Request Permissions : Click here
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Metalorganic
Deposition of YBCO Films for Second-Generation High-Temperature Superconductor Wires
Martin W. Rupich, Darren T.Verebelyi, Wei Zhang, Thomas Kodenkandath, and Xiaoping Li Abstract Metalorganic deposition (MOD) is an attractive process for low-cost, high-rate deposition of YBa2Cu3O7– (YBCO) films on continuous lengths of biaxially textured metallic templates for second-generation (2G) high-temperature superconductor (HTS) wires. MOD of YBCO films involves four steps: precursor synthesis, coating, decomposition, and reaction. The final films must meet stringent requirements, including high critical current, uniformity across the width and along the length of the textured substrate, and excellent mechanical properties. Achieving these properties has required the development of a metalorganic precursor that produces an intermediate BaF2-based film, which in turn is converted to a high-quality YBCO film. Understanding and controlling the deposition of the metalorganic precursor and its conversion to YBCO are critical to reproducibly manufacturing uniform, high-performance, HTS wires required for commercial applications. This article reviews the issues that must be addressed in the use of MOD for low-cost YBCO film fabrication and summarizes the performance of 2G HTS wires prepared by this manufacturing process. Keywords: second-generation high-temperature superconductors, metalorganic deposition, YBa2Cu3O7– , YBCO.
Introduction A major challenge facing the commercialization of high-temperature superconductor (HTS) wires is reducing the cost of manufacturing while maintaining the performance required for practical applications.1 A key metric for the wire is the price/ performance ratio, or cost per kiloampere572
meter. Second-generation HTS wire is based on an epitaxial YBCO film deposited on a biaxially textured template, while firstgeneration HTS wire is based on a multifilamentary Bi-2223/Ag composite. Thus, in the development of second-generation (2G) wire, a primary concern was choosing
a cost-effective manufacturing process that maintains high electrical performance in the YBCO layer. Among the various processes used for the deposit
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