Somayazulu Maddury, Ahart Muhtar, Meng Yue, Ciezak Jennifer, Velisavlevic Nenad, Hemley Russell J
HPCAT, X-ray Science Division, Argonne National Laboratory, Argonne, IL, USA.
Department of Physics, University of Illinois Chicago, IL, USA.
Philos Trans A Math Phys Eng Sci. 2023 Oct 16;381(2258):20220331. doi: 10.1098/rsta.2022.0331. Epub 2023 Aug 28.
We report the equation of state measurements of BC to 50 GPa and approximately 2500 K in laser-heated diamond anvil cells. We obtain an ambient temperature, third-order Birch-Murnaghan fit to the data that yields a bulk modulus of 221(2) GPa and derivative, (d/d) of 3.3(1). These were used in fits with both a Mie-Grüneisen-Debye model and a temperature-dependent, Birch-Murnaghan equation of state that includes thermal pressure estimated by thermal expansion () and a temperature-dependent bulk modulus (d/d). The ambient pressure thermal expansion coefficient (), Grüneisen () = (/) and volume-dependent Debye temperature, were used as input parameters for these fits and found to be sufficient to describe the data in the whole range of this study. This article is part of the theme issue 'Exploring the length scales, timescales and chemistry of challenging materials (Part 1)'.
我们报告了在激光加热金刚石对顶砧中对BC进行的状态方程测量，压力达到50 GPa，温度约为2500 K。我们获得了一个在室温下对数据的三阶Birch-Murnaghan拟合，得到的体模量为221(2) GPa，导数(d/d)为3.3(1)。这些数据被用于Mie-Grüneisen-Debye模型和一个与温度相关的Birch-Murnaghan状态方程的拟合中，后者包括通过热膨胀( )估计的热压力和与温度相关的体模量(d/d)。室温下的热膨胀系数( )、格林爱森系数( ) = ( / )和与体积相关的德拜温度被用作这些拟合的输入参数，发现它们足以描述本研究整个范围内的数据。本文是主题为“探索具有挑战性材料的长度尺度、时间尺度和化学性质（第1部分）”的一部分。
