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瞬态液相辅助化学溶液沉积法（TLAG-CSD）中氧分压跃升路径生长YBa2Cu3O7-δ的外延取向依赖前驱相中的钡铜比。为了探究这现象的深层机理，本文在中高温热处理过程中探究了不同氧分压、不同钡铜比组分对钡铜氧液相（[Ba-Cu-O]L）以及反应中间相转变的影响。研究表明：液相的形成都具有点到面的特性；液相出现的温度差异、形态差异，主要由组分决定，氧分压只起辅助作用。Y:Ba:Cu=0:3:7（0-3-7）都先于Y:Ba:Cu=0:2:3（0-2-3）出现液相，温差在20℃（高氧分压）或40℃（低氧分压）。实验发现这两组分的中间相性状存在差异，高氧分压下中间相BaCuO2在0-3-7组分是单一特征峰，晶粒大而分散；0-2-3组分则是多特征峰，晶粒小而密集。导致0-3-7组分的液相区表面积小于0-2-3组分，进而两组分液相中Y3+过饱和度不同，造成YBCO的取向差异。最后总结得出无氟液相生成的基本模型，完全的[Ba-Cu-O]L膜可由0-2-3组分在750℃高氧分压下生成。
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关键词:
- TLAG-CSD /
- YBa2Cu3O7-δ外延取向 /
- [Ba-Cu-O]L /
- 钡铜比
The epitaxial orientation of YBa2Cu3O7-δ grown via the oxygen partial pressure jump pathway in transient liquid-phase assisted chemical solution deposition (TLAG-CSD) depends on the barium copper ratio in the precursor phase. To explore the underlying mechanism of this phenomenon, this article investigated 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 during the medium-high temperature heat treatment process. Research has shown 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). The experiment found 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 was summarized, and the complete [Ba-Cu-O]L film can be generated from the 0-2-3 component at high oxygen partial pressure at 750℃.-
Keywords:
- TLAG-CSD /
- Epitaxial Orientation of YBa2Cu3O7-δ /
- [Ba-Cu-O]L /
- Barium copper ratio
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