Transient liquid phase-assisted fluorine-free chemical fabrication of YBa2Cu3O7–δ and complete [Ba-Cu-O]L liquid phase films: Phase transformations during intermediate-high temperature heat treatment

TAO Jiaqi; LIU Zhiyong; ZHOU Xinghang; FU Yixue; LI Minjuan; CAI Chuanbing

doi:10.7498/aps.74.20250037

Abstract

The epitaxial orientation of YBa₂Cu₃O_7–δgrown via the oxygen partial pressure jump pathway in transient liquid-phase assisted chemical solution deposition (TLAG-CSD) depends on the barium-to-copper ratio in the precursor phase. To explore the mechanism behind this phenomenon, in this work we investigate the effects of different oxygen partial pressures and barium-to-copper ratio components on the barium-copper-oxygen liquid phase ([Ba-Cu-O]_L) and the intermediate phase transition in the medium-high temperature heat treatment process. The research shows that the formation of the liquid phase exhibits a point-to-surface characteristic; the temperature and morphological differences in the liquid phase are mainly determined by the composition, with oxygen partial pressure only playing a supporting role. Y∶Ba∶Cu = 0∶3∶7 (0-3-7) components all appear before Y∶Ba∶Cu = 0∶2∶3 (0-2-3) components in the liquid phase, with a temperature difference of 20 ℃ (high oxygen partial pressure) or 40 ℃ (low oxygen partial pressure). Experimental results indicate that there are differences in the intermediate phase properties between these two components. Under high oxygen partial pressure, the intermediate phase BaCuO₂ exhibits a single characteristic peak in the 0-3-7 component, with large and dispersed grains; the 0-2-3 component has multiple characteristic peaks, with small and dense grains. The surface area of the liquid phase region in the 0-3-7 component is smaller than that in the 0-2-3 component, resulting in different supersaturation levels of Y³⁺ in the liquid phases of the two components and causing orientation differences in YBCO. Finally, the basic model for the formation of fluorine-free liquid phase is summarized, and the complete [Ba-Cu-O]_L film can be generated from the 0-2-3 component at high oxygen partial pressure and 750 ℃.

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Corresponding author: LIU Zhiyong, zyliu@shu.edu.cn ; CAI Chuanbing, cbcai@t.shu.edu.cn

Funds: Project supported by the National Key R&D Program of China (Grant No. 2022YFE03150200), the National Natural Science Foundation of China (Grant Nos. 52172271, 52307026, 52477022), and the Science and Technology Innovation Program of Shanghai, China (Grant No. 23511101600).

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Vol. 74, Issue 10 - 2025-05-20

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