In this research, we explore electrocoloration experiments as an easily accessible and non-destructive technique for visualizing and quantifying ionic defect flows in oxide thin films, with a specific focus on calcium-doped bismuth ferrite (Ca-doped BiFeO, or BCFO) as the model material. This study utilizes the observation of color transitions induced by electrical bias to elucidate the dynamics of ionic migration and defect behaviors in these materials. To augment the insights gained from electrocoloration, we integrate traditional methodologies such as electrochemical impedance spectroscopy, thereby enriching our comprehension of these phenomena and corroborating our experimental results. Our investigations disclose fascinating phenomena, notably filamentary conduction and the kinetic roughening of color fronts. Consequently, electrocoloration emerges as a promising investigative tool for examining ionic migration in oxide-based materials, with potential implications for enhancing technologies in fields such as resistive random access memory and solid oxide fuel cells.

中文翻译：

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通过电着色对离子缺陷流进行可视化和定量

在这项研究中，我们探索电着色实验作为一种易于使用且非破坏性的技术，用于可视化和量化氧化物薄膜中的离子缺陷流，特别关注钙掺杂铁酸铋（Ca 掺杂 BiFeO，或 BCFO）作为模型材料。这项研究利用对电偏压引起的颜色转变的观察来阐明这些材料中离子迁移和缺陷行为的动力学。为了增强从电着色中获得的见解，我们整合了电化学阻抗谱等传统方法，从而丰富了我们对这些现象的理解并证实了我们的实验结果。我们的研究揭示了令人着迷的现象，特别是丝状传导和色锋的动力学粗糙化。因此，电着色成为一种有前途的研究工具，用于检查氧化物材料中的离子迁移，对增强电阻随机存取存储器和固体氧化物燃料电池等领域的技术具有潜在影响。