1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China 2School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China 3State Key Laboratory of Heavy Oil Processing, College of New Energy and Materials, China University of Petroleum, Beijing 102249, China 4Yangtze River Delta Physics Rearch Center, Liyang 213300, China 5Songshan Lake Materials Laboratory, Dongguan 523808, China
Abstract：Polycrystalline BAs$_{x}$ ($x = 0.80$–1.10) compounds with different boron-to-arsenic elemental molar ratios were synthesized by a high-pressure and high-temperature sintering method. Compared with other ambient-pressure synthesis methods, high pressure can significantly promote the reaction speed as well as the reaction yield. As the content of arsenic increases from $x = 0.91$ to 1.10, the thermal conductivity of BAs$_{x}$ gradually increases from 53 to 65 W$\cdot$m$^{-1}\cdot$K$^{-1}$. Furthermore, the temperature dependence of thermal conductivities of these samples reveals an Umklapp scattering due to the increasing phonon population. This work provides a highly efficient method for polycrystalline BAs synthesis.
Tian F, Song B, Chen X, Ravichandran N K, Lv Y, Chen K, Sullivan S, Kim J, Zhou Y, Liu T H, Goni M, Ding Z, Sun J, Udalamatta Gamage G A G, Sun H, Ziyaee H, Huyan S, Deng L, Zhou J, Schmidt A J, Chen S, Chu C W, Huang P Y, Broido D, Shi L, Chen G and Ren Z 2018 Science361 582
2020, Vol. 37 
