YBa2Cu3O7-δ薄膜的BaCl2/BaF2-MOD法制备及超导特性研究

doi:10.15541/jim20220302

无机材料学报 ›› 2023, Vol. 38 ›› Issue (2): 199-204.DOI: 10.15541/jim20220302

YBa₂Cu₃O_7-_δ薄膜的BaCl₂/BaF₂-MOD法制备及超导特性研究

陈明月(), 颜志超, 陈静, 李敏娟, 刘志勇, 蔡传兵()

上海大学理学院, 物理系, 上海市量子与超导新物态前沿科学基地, 上海市高温超导重点实验室, 上海 200444

收稿日期:2022-05-29 修回日期:2022-06-24 出版日期:2023-02-20 网络出版日期:2022-09-15
通讯作者: 蔡传兵, 教授. E-mail: cbcai@t.shu.edu.cn
作者简介:陈明月(1996-), 女, 硕士研究生. E-mail: Chenmingyue@shu.edu.cn
基金资助:
国家自然科学基金(52172271);中国科学院战略性先导科技专项(XDB25000000)

YBa₂Cu₃O_7-_δ Thin Film: Preparation by BaCl₂/BaF₂-MOD Method and Superconducting Property

CHEN Mingyue(), YAN Zhichao, CHEN Jing, LI Minjuan, LIU Zhiyong, CAI Chuanbing()

Shanghai Key Laboratory of High Temperature Superconductors, Shanghai Frontiers Science Center of Quantum and Superconducting Matter States, Department of Physics, College of Sciences, Shanghai University, Shanghai 200444, China

Received:2022-05-29 Revised:2022-06-24 Published:2023-02-20 Online:2022-09-15
Contact: CAI Chuanbing, professor. E-mail: cbcai@t.shu.edu.cn
About author:CHEN Mingyue (1996-), female, Master candidate. E-mail: Chenmingyue@shu.edu.cn
Supported by:
National Natural Science Foundation of China(52172271);Strategic Priority Research Program of the Chinese Academy of Sciences(XDB25000000)

摘要/Abstract

摘要：

传统三氟乙酸金属有机化学溶液沉积法(TFA-MOD)制备YBa₂Cu₃O_7-_δ(YBCO)超导层, Ba倾向于与F结合, 从而避免BaCO₃的形成。本工作开展了新型基于BaCl₂/BaF₂途径的化学溶液法生长YBCO超导薄膜的研究。重点研究了添加Cl对YBCO薄膜晶粒取向、微观结构和超导性能的影响, 并通过生长反应的热化学计算, 分析了BaCl₂途径YBCO薄膜的物相转变机制。结果表明: 添加Cl有利于抑制a轴晶粒取向, 促进c轴晶粒成核。添加Cl的YBCO双层膜起始转变温度(T_c-onset)没有明显变化, 约为89.6 K, 其临界电流密度(J_c)显著提升, J_c达到2.07 MA/cm² (77 K, 自场)。此外, 生长反应过程的物相转变分析表明Cl优先与Ba结合形成BaCl₂, 有效避免BaCO₃的形成。本研究结果表明: 添加Cl对制备YBCO超导厚膜有促进作用, 这为MOD法制备YBCO提供了一种新思路。

关键词: YBCO薄膜, MOD法, Cl添加, 物相转变

Abstract:

Conventional trifluoroacetic acid metal organic chemical solution deposition (TFA-MOD) method for the preparation of YBa₂Cu₃O_7-_δ (YBCO) superconducting layers follows the BaF₂ growth mechanism. In this work, a novel chemical solution method based on BaCl₂/BaF₂ pathway for the growth of YBCO superconducting thin films was carried out. The effects of Cl addition on grain orientation, microstructure and superconductivity of YBCO thin films were investigated, and mechanism of the phase transition of YBCO thin films in the BaCl₂ pathway was explored by thermochemical calculations of the growth reaction. The results show that the Cl addition inhibits a-axis grain orientation and promotes nucleation of c-axis grains. Onset transition temperature (T_c-onset) of the YBCO 2-layer film is about 89.6 K without significant change after Cl addition. But its critical current density (J_c) is significantly increased to 2.07 MA/cm² (77 K, self-field). Meanwhile, the phase transition of the growth reaction process shows that Cl is preferentially combined with Ba to form BaCl₂ as much as possible, effectively avoiding the formation of BaCO₃. All results of this study indicate that Cl addition facilitates preparation of YBCO superconducting thick films, and provides a new idea for the preparation of YBCO by MOD method.

Key words: YBCO thin film, MOD method, Cl addition, phase transition

中图分类号:

TQ174

陈明月, 颜志超, 陈静, 李敏娟, 刘志勇, 蔡传兵. YBa₂Cu₃O_7-_δ薄膜的BaCl₂/BaF₂-MOD法制备及超导特性研究[J]. 无机材料学报, 2023, 38(2): 199-204.

CHEN Mingyue, YAN Zhichao, CHEN Jing, LI Minjuan, LIU Zhiyong, CAI Chuanbing. YBa₂Cu₃O_7-_δ Thin Film: Preparation by BaCl₂/BaF₂-MOD Method and Superconducting Property[J]. Journal of Inorganic Materials, 2023, 38(2): 199-204.

图/表 8

图1 BaCl2/BaF2-MOD法制备的YBCO单层和双层膜的XRD谱图

Fig. 1 XRD patterns of YBCO 1- and 2-layered films prepared by the BaCl2/BaF2-MOD method

图2 BaCl2/BaF2-MOD法制备的YBCO双层膜的(a) ω扫描XRD谱图和(b)拉曼光谱图

Fig. 2 (a) ω scan XRD patterns and (b) Raman spectra of YBCO 2-layered films prepared by BaCl2/BaF2-MOD method

图3 BaCl2/BaF2-MOD法制备的YBCO单层膜和晶化膜的SEM照片(插图为EDS扫描结果)

Fig. 3 SEM images of 1-layered and crystallized YBCO film prepared by the BaCl2/BaF2-MOD method Low-temperature pyrolysis film of (a) Cl free and (b) Cl addition; YBCO crystallized film of (c) Cl free and (d) Cl addition, (e) corresponding EDS result of the white cycle area in Fig(d)

图4 BaCl2/BaF2-MOD法制备的YBCO双层膜的SEM照片

Fig. 4 SEM images of YBCO 2-layered films prepared by the BaCl2/ BaF2-MOD method (a, c) Cl free and (b, d) Cl addition, different magnification

图5 BaCl2/BaF2-MOD法制备的YBCO单层和双层薄膜的临界电流密度特性

Fig. 5 Critical current density characteristics of YBCO 1- and 2-layered films prepared by the BaCl2/BaF2-MOD method

图6 BaCl2/BaF2-MOD法制备的YBCO双层膜的磁化强度的温度依赖性

Fig. 6 Temperature dependence of magnetization intensity of YBCO 2-layered films prepared by the BaCl2/BaF2-MOD method 1 Am2=103 emu

图7 BaCl2/BaF2-MOD法制备YBCO单层和双层薄膜在不同温度下Jc的场依赖性

Fig. 7 Field dependence of Jc at different temperatures for YBCO 1- and 2-layered films prepared by the BaCl2/BaF2-MOD method (a, b) 1-layer film at 30 and 77 K; (c, d) 2-layer films 30 and 77 K, respectively

图8 不同分压下BaCl2途径YBCO反应吉布斯自由能变化的温度依赖性

Fig. 8 Temperature dependence of the change in Gibbs free energy of the YBCO reaction through the BaCl2 pathway at different partial pressures (a) $p_{\text{HCl}}^{\text{2}}/{{p}_{{{H}_{2}}O}}=1$; (b) $p_{\text{HCl}}^{\text{2}}/{{p}_{{{H}_{2}}O}}=1\times {{10}^{-8}}$; (c) $p_{\text{HCl}}^{\text{2}}/{{p}_{{{H}_{2}}O}}=1\times {{10}^{-13}}$

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YBa₂Cu₃O_7-_δ薄膜的BaCl₂/BaF₂-MOD法制备及超导特性研究

YBa₂Cu₃O_7-_δ Thin Film: Preparation by BaCl₂/BaF₂-MOD Method and Superconducting Property

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