Superconducting joint ofGdBa2Cu3Oy coated conductors by crystallization of additionally deposited precursor layer
Superconducting joint ofGdBa2Cu3Oy coated conductors by crystallization of additionally deposited precursor layer
复制标题
通过额外沉积的前体层结晶形成 GdBa2Cu3Oy 涂层导体的超导接头
DOI：
10.1109/tasc.2019.2902693
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发表时间：
2019
影响因子：
1.8
通讯作者：
M. Inoue
中科院分区：
文献类型：
--
作者：
R. Teranishi;K. Hiramatsu;S. Yasuyama;T. Miyajima;Y. Sato;K. Kaneko;S. Awaji;A. Matsumoto;M. Inoue
REBa_2Cu_3O_y（REBCO）涂层导体（CC）的超导接头已经强烈地要求制造用于高场磁体应用（例如核磁共振和磁共振成像）的长长度CC。在以往的超导接头的报道中，通过熔化REBCO相或通过REBCO相的固态扩散来连接REBCO CC样品。在我们的研究中，我们提出了一种新的REBCO CC的连接方法。通过金属有机沉积工艺在GdBCO CC上额外沉积前体层，然后将其中两片面对面地粘合在一起，并在氧气气氛中在机械压力下使前体结晶以形成123相。用透射电子显微镜和四探针法分别对接头试样的微观结构和电阻随温度的变化关系进行了表征。结果，TEM观察揭示了两个CC接合在一起，而在接合界面处没有形成第二相。此外，电阻的温度依赖性示出Tc起始和Tc零分别为93 K和82 K。从而成功地完成了超导接头的研制。这种方法的概念是结合膜生长和固态扩散的额外沉积的前体层。
A superconducting joint of REBa2Cu3Oy(REBCO) coated conductors (CCs) has been demanded strongly to fabricate long length CCs for high field magnet applications such as nuclear magnetic resonance and magnetic resonance imaging. In the previous reports of superconducting joint, specimens of REBCO CCs were jointed via melting REBCO phases or via solid state diffusion of REBCO phases. In our study, we propose a new method of joint for REBCO CCs. A precursor layer is additionally deposited on GdBCO CC by a metal organic deposition process, and then two pieces of them are stuck together face-to-face and crystallized the precursor to form 123 phase under mechanical pressure in an oxygen atmosphere. The microstructures and temperature dependence of resistance of the jointed sample are characterized by a cross-sectional transmission electron microscopy (TEM) and a four-probe method, respectively. As a result, TEM observation reveals that two CCs are jointed together without formation of secondary phases at the joint interface. Also, temperature dependence of resistance shows Tc onset and Tc zero of 93 K and 82 K, respectively. Consequently, a superconducting joint has been completed successfully. The concept of this method is combining film growth and solid-state diffusion for the additionally deposited precursor layers.