Fast grain?boundary diffusion paths in ionic solids: Space?charge layers versus interfacial core
نویسندگان
چکیده
The accelerated diffusion of ions along grain boundaries in ionic solids may occur two possible paths: (a) the interface core (IC), as known for metals; and (b) space-charge layers (SCLs), located adjacent to core, which point defects responsible are accumulated. In this study, we examined whether it is possible, on basis profiles, discriminate between IC SCL paths. Taking cation MO2 oxides our example system, used finite-element-method (FEM) calculations obtain profiles various combinations fast grain-boundary Three characteristics feature were investigated: quantitative description “tail”, its dependence time, temperature (activation enthalpy). For all calculated with varying ratios diffusion, no criterion was found that allowed dominant path be identified. Consideration activation enthalpies, however, provide an indication path: If energy approaches or equals enthalpy bulk one conclude dominates.
منابع مشابه
Origin of fast ion diffusion in super-ionic conductors
Super-ionic conductor materials have great potential to enable novel technologies in energy storage and conversion. However, it is not yet understood why only a few materials can deliver exceptionally higher ionic conductivity than typical solids or how one can design fast ion conductors following simple principles. Using ab initio modelling, here we show that fast diffusion in super-ionic cond...
متن کاملDiffusion in Nanocrystalline Solids
Enhanced atomic migration was an early observation from experimental studies into nanocrystalline solids. This contribution presents an overview of the available diffusion data for simple metals and ionic materials in nanocrystalline form. It will be shown that enhanced diffusion can be interpreted in terms of atomic transport along the interfaces, which are comparable to grain boundaries in co...
متن کاملWrinkling of Interfacial Layers in Stratified Composites
O DOI: 10.1002/adem.201200387 M M U Wrinkling of Interfacial Layers in Stratified Composites** N IC By Yaning Li,y Narges Kaynia,y Stephan Rudykh and Mary C. Boyce* A T IO N Many structured composites in nature possess undulating and wrinkled interfacial layers that regulate mechanical, chemical, acoustic, adhesive, thermal, electrical, and optical functions, and also serve to reveal underlying...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of the American Ceramic Society
سال: 2021
ISSN: ['0002-7820', '1551-2916']
DOI: https://doi.org/10.1111/jace.17905