Entropies of defect association in ceria from first principles

文献情報

出版日 2017-10-24

DOI 10.1039/C7CP03817H

インパクトファクター 3.676

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要旨

Defects and their interactions play a crucial role for the properties of solid state materials. While energies of defect formation and defect interaction are commonly calculated from first principles, calculations of corresponding vibrational entropies in solids are less common due to the high computational demand. This is in particular true for defect pairs as the existence of multiple defects lowers the symmetry of the cell. Here, we determine the entropies of association of defects in doped cerium oxide by density functional theory and phonon calculations. We estimate the importance of the entropic contribution in the constant volume and constant pressure case and address the limitations of the calculations. The small values of the calculated entropies render the accurate determination difficult. However, even small entropy contributions could have a significant influence on defect interactions and ordering at high temperature.

掲載誌

Physical Chemistry Chemical Physics

CiteScore: 5.5

自己引用率: 10.3%

年間論文数: 3036

Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.

Entropies of defect association in ceria from first principles

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