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⋅m −1 ⋅ 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.

中文翻译：

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多晶BAs的高压合成和热传递性质x

通过高压高温烧结法合成了硼元素与砷元素摩尔比不同的多晶BAs x（x = 0.80-1.10）。与其他常压合成方法相比，高压可以显着提高反应速度和反应产率。随着砷含量从x = 0.91增加到1.10，BAs x的热导率从53逐渐增加到65 W·m -1·K -1。此外，由于声子数量的增加，这些样品的热导率与温度的关系揭示了Umklapp散射。这项工作为多晶BA的合成提供了一种高效的方法。