Thermal transport properties and lattice vibration modes in crystalline and amorphous LaMgAl11O19

WJ Huang and JW Che and XZ Wang and NC Peng, JOURNAL OF ALLOYS AND COMPOUNDS, 955, 170245 (2023).

DOI: 10.1016/j.jallcom.2023.170245

Thermal energy transport plays a crucial role in determining the performance of LaMgAl11O19-based ap-plications. Herein, we report the inherent thermal transport in crystalline (c-LMA) and amorphous LMA (a-LMA) using atomistic simulations. It is found that c-LMA have a low K comparable to the classical 7YSZ at 300-1500 K, while the K of a-LMA is 8-68% lower than that of c-LMA. The mode decomposition shows that the phonon modes in c-LMA consist of local, normal and diffuse modes, while those in a-LMA consist of local and diffuse modes. The dual-channel model reveals that the thermal conduction in c-LMA is domi-nated by the normal modes at low temperatures (< 420 K) while by the diffusive modes at high tem-peratures, but that in a-LMA results entirely from diffusive modes. This new insight into the thermal transport properties in c-LMA and a-LMA provides a foundation for designing LH-based thermal manage- ment applications.(c) 2023 Elsevier B.V. All rights reserved.

Return to Publications page