拉曼光谱测定固体电解质材料中离子扩散系数的研究

固态氧化物电解质材料被广泛应用于燃料电池，氧传感器，氧泵等，对发展清洁能源和保护环境扮演重要角色。常见固态氧化物电解质材料导电机制是氧离子通过晶格中的氧空位沿电场方向定向移动。固态氧化物电解质中氧离子的输运能力是评价固态氧化物电解质材料性能的重要参数，氧扩散系数和迁移能力对于寻找筛选出新型的性能优异电解质材料至关重要。现有材料扩散系数的测试方法主要为同位素示踪剂法、阻抗谱法、核磁共振和穆斯波尔谱法等，对于设备和样品要求高，测试不方便等。本课题研究一种独创的利用拉曼光谱测定固体电解质材料中离子扩散系数的原理和方法。与传统的扩散系数方法相比本研究的原理是通过非接触式光学方法检测样品中伴随离子（空位）迁移由一种结构状态变为另一种状态的过程，该方法简便，快速，准确，非接触性检测。本课题对于发展我国具有独立自主知识产权的新的材料测试技术与仪器具有基础性和实用性重要意义，也为新能源材料发展做出贡献。

Solid oxide electrolyte materials are widely used in fuel cells, oxygen sensors, oxygen pumps, etc., which play an important role in developing clean energy and protecting the environment. The common conductive mechanism of solid oxide electrolyte materials is that the oxygen ions move in the direction of the electric field through the oxygen vacancy in the lattice. The transport capacity of oxygen ions in solid oxide electrolyte is an important parameter to evaluate the performance of solid oxide electrolyte materials. Currently, the main methods for testing the diffusion coefficient of materials are isotope tracer method, impedance spectroscopy, nuclear magnetic resonance (NMR) and Mossbauer spectroscopy (MS). This project presents an original method for the determination of ion diffusion coefficient in solid electrolyte materials by Raman spectroscopy. Compared with the traditional diffusion coefficient method, the principle of this study is to detect the process of accompanied ion (vacancy) migration from one structural state to another in samples by non-contact optical method. This method is simple, fast, accurate and non-contact. This topic is of fundamental and practical significance for the development of new material testing technologies and instruments with independent intellectual property rights in China, and also contributes to the development of new energy materials.