Lattice dynamics in ionic conductors

具有大离子电导率的固体离子导体在许多应用中是不可替代的，例如电池、固体氧化物燃料电池、太阳能热发电机和氧传感器。对固态离子传输的更好的基本理解预计将影响这些相关领域，并有助于下一代能源技术。理解固态离子传导的经典方法集中于晶体学扩散途径和假设静态晶格环境的载流子浓度的优化。化学直觉已经帮助识别出更好的离子导体，使用具有更易极化和更软晶格的固体，这表明动态晶格对离子输运的影响更大。这一提议的假设是基于晶格和运动离子之间的相互作用;也就是说，晶格动力学的变化将影响离子运动。晶格极化率，晶格柔软度和晶格振动的非谐性的影响将被研究，测量和相关的离子传导的变化。该提案旨在通过将在热电领域获得的经验丰富的申请人的知识和工具集与离子导体相结合，更好地了解固体中的离子电导率。

Solid ion conductors with large ionic conductivities are irreplaceable in many applications such as batteries, solid oxide fuel cells, solar thermal generators, and oxygen sensors. A better fundamental understanding of ionic transport in the solid-state is expected to impact these related fields and help with next-generation energy technologies. Classical approaches for understanding ionic conduction in the solid state focus on crystallographic diffusion pathways and optimization of carrier concentration assuming a static lattice environment. Chemical intuition has helped to identify better ionic conductors using solids with more polarizable and softer lattices, suggesting a greater influence of a dynamic lattice on the ionic transport.The hypothesis of this proposal is based on the interactions between the lattice and the moving ion; that is, changes in the lattice dynamics will influence ionic motion. The effect of lattice polarizability, lattice softness and anharmonicity of lattice vibrations will be studied, measured and correlated to changes in the ionic conduction. This proposal seeks a better fundamental understanding of ionic conductivity in solids by combining the knowledge and toolset of the experienced applicant, gained in the field of thermoelectrics, with ionic conductors.