The Proceedings of the Thermal Engineering Conference
Online ISSN : 2424-290X
2018
Session ID : 0176
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Thermal Conductivity Reduction of Bulk GaAs using Giant Strain
Sivasankaran HarishYoshifumi IkomaYasuyuki TakataZenji HoritaMasamichi Kohno
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Abstract

We report a dramatic and irreversible reduction in the lattice thermal conductivity of bulk-crystalline Gallium Arsenide (GaAs) when subjected to intense plastic strain under a pressure of 24 GPa using high-pressure torsion (HPT). Thermal conductivity measurements show that the HPT-processed samples have a lattice thermal conductivity reduction by a factor of approximately 6 (from intrinsic single crystalline value of 42 Wm-1 K-1 to approximately 7 Wm-1 K-1). Thermal conductivity reduction in HPT-processed GaAs is attributed to the formation of nanograin boundaries and metastable phases which act as phonon scattering sites, and because of a large density of lattice defects introduced by HPT processing. Annealing the samples at 873 K increases the thermal conductivity due to the reduction in the density of secondary phases and lattice defects.

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© 2018 The Japan Society of Mechanical Engineers
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