Quenching rattling modes in skutterudites with pressure

Article

关键词: THERMOELECTRIC-MATERIALS;    THERMAL-CONDUCTIVITY;    FILLED SKUTTERUDITES;    ANTIMONIDES;    SCATTERING;   

DOI  :  10.1103/PhysRevB.91.224304

来源: SCIE

【 摘 要 】

A high-pressure study of the lattice dynamics in the filled skutterudite Eu0.84Fe4Sb12 was carried out by means of x-ray powder diffraction and nuclear inelastic scattering. The anharmonicity of particular phonon modes was characterized by mode and element specific Gruneisen parameters. The large anharmonicity of the rattling optical mode that is hybridized with the acoustical phonons at ambient pressure is reduced at high pressure as the phonon modes decouple. This result suggests that anharmonic coupling between acoustic and optical phonon modes plays a central role in the reduced thermal conductivity.

【 授权许可】

Free