YBa2Cu3O7-δ Thin Film: Preparation by BaCl2/BaF2-MOD Method and Superconducting Property

doi:10.15541/jim20220302

Abstract

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

CLC Number:

TQ174

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.

Figures/Tables 8

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

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

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)

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

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

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

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

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) $p_{\text{HCl}}^{\text{2}}/{{p}_{{{H}_{2}}O}}=1\times {{10}^{-13}}$

References 26

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

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