Journal
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
Volume 64, Issue 11, Pages -Publisher
SCIENCE PRESS
DOI: 10.1007/s11433-021-1748-7
Keywords
phonon; phonon anharmonicity; thermodynamics; inelastic neutron; X-ray scattering; 63; 20; -e; 63; 20; Ry; 63; 10; +a; 63; 20; Dj; 63; 20; Ls
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Funding
- National Natural Science Foundation of China [12172047]
- Beijing Natural Science Foundation [Z190011]
- Beijing Institute of Technology Research Fund Program for Young Scholars
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Anharmonic lattice vibrations are crucial in thermal dynamics of condensed matters, affecting atom interactions and heat conduction. Recent studies have revealed novel behaviors and potential applications driven by phonon anharmonicity, offering opportunities for superior material performance. However, challenges and future prospects in understanding and utilizing phonon anharmonicity remain to be addressed.
Anharmonic lattice vibrations play pivotal roles in the thermal dynamics in condense matters and affect how the atoms interact and conduct heat. An in-depth understanding of the microscopic mechanism of phonon anharmonicity in condensed systems is critical for developing better functional and energy materials. In recent years, various novel behaviors in condense matters driven by phonon anharmonic effects were discovered, such as soft mode phase transition, negative thermal expansion (NTE), multiferroicity, ultralow thermal conductivity (kappa), high thermal resistance, and high-temperature superconductivity. These properties have endowed anharmonicity with many promising applications and provided remarkable opportunities for developing Anharmonicity Engineering-regulating heat transport towards excellent performance in materials. In this work, we review the recent development of studies on phonon anharmonic effect and summarize its origin, mechanism, research methods, and applications. Besides, the remaining challenges, future trends, and prospects of phonon anharmonicity are also discussed.
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