Lattice dynamics in ionic conductors

具有大离子电导率的固体离子导体在电池、固体氧化物燃料电池、太阳能热发电机和氧传感器等许多应用中是不可替代的。对固态离子输运的更好的基本理解有望影响这些相关领域，并有助于下一代能源技术的发展。理解固态离子传导的经典方法集中在晶体学扩散途径和假设静态晶格环境下载流子浓度的优化。化学直觉帮助我们用具有更极化和更柔软晶格的固体来识别更好的离子导体，这表明动态晶格对离子传输有更大的影响。这一提议的假设是基于晶格与运动离子之间的相互作用；也就是说，晶格动力学的变化会影响离子运动。研究、测量了晶格极化率、晶格柔软度和晶格振动的非调和性对离子传导变化的影响。本提案旨在通过将热电学领域的经验丰富的申请人的知识和工具集与离子导体相结合，对固体中的离子电导率有更好的基本理解。

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.