Pressure-driven anomalous thermal transport behaviors in gallium arsenide

ZY Zhang and XH Fan and J Zhu and KP Yuan and J Zhou and DW Tang, JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY, 142, 89-97 (2023).

DOI: 10.1016/j.jmst.2022.10.009

High-pressure has been widely utilized to improve material performances such as thermal conductivity.and interfacial thermal conductance G. Gallium arsenide (GaAs) as a functional semiconductor has attracted extensive attention in high-pressure studies for its technological importance and complex structure transitions. Thermal properties of GaAs under high pressure are urgent needs in physics but remain elusive. Herein, we systematically investigate.GaAs and G Al/GaAs of multi- structure up to similar to 23 GPa. We conclude that: (1) in pressurization, phonon group velocity, lattice defects, and electrons play a central role in.GaAs in elastic, plastic, and metallization regions, respectively. The increased phonon density of states (PDOS) overlap, group velocity, and interfacial bonding enhances G Al/GaAs. (2) In depressurization, electrons remain the dominant factor on.GaAs from 23 to 13.5 GPa. G Al/GaAs increases dramatically at similar to 12 GPa due to the larger PDOS overlap. With decompressing to ambient, lattice defects including grain size reduction, arsenic vacancies, and partial amorphization reduce.GaAs to a glass-like value. Remarkably, the released G Al/GaAs is 2.6 times higher than that of the initial. Thus our findings open a new dimension in synergistically realizing glass- like.and enhancing G, which can facilitate thermoelectric performance and its potential engineering applications.

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