Exploring the hardness and high-pressure behavior of osmium and ruthenium-doped rhenium diboride solid solutions
Exploring the hardness and high-pressure behavior of osmium and ruthenium-doped rhenium diboride solid solutions
复制标题
DOI：
10.1063/5.0135620
复制
发表时间：
2023-03
期刊：
影响因子：
6.1
通讯作者：
Shanling Hu;Lisa E. Pangilinan;Christopher L. Turner;R. Mohammadi;A. Kavner;R. Kaner;S. Tolbert
中科院分区：
文献类型：
--
作者：
Shanling Hu;Lisa E. Pangilinan;Christopher L. Turner;R. Mohammadi;A. Kavner;R. Kaner;S. Tolbert
二硼化铼（ReB2）因其褶皱的硼片阻碍剪切变形而表现出很高的差应变。在这里，我们展示了如何利用固溶体形成来提高 ReB2 的维氏硬度和差应变。ReB2 结构固溶体（Re0.98Os0.02B2 和 Re0.98Ru0.02B2，分别称为 "ReOsB2 "和 "ReRuB2"）是由纯元素通过电弧熔融法合成的。在金刚石砧室中进行了原位高压径向 X 射线衍射，以研究 ReOsB2 和 ReRuB2 在 ∼56 GPa 下的不可压缩性和晶格应变。与纯 ReB2 相比，两种固溶体都表现出更高的不可压缩性和微分应变。然而，在 ReB2 结构中掺入锇（Os）后，所有晶格平面都得到了增强，而只有最弱的 ReB2 晶格平面在钌（Ru）的作用下得到了增强。这些结果与这两种体系的维氏硬度测量结果一致，即 ReOsB2 的硬度更高。高压研究与实验观察到的硬度数据相结合，提供了有关 ReB2 体系内在硬度增强背后的强化机制的特定晶格信息。
Rhenium diboride (ReB2) exhibits high differential strain due to its puckered boron sheets that impede shear deformation. Here, we demonstrate the use of solid solution formation to enhance the Vickers hardness and differential strain of ReB2. ReB2-structured solid solutions (Re0.98Os0.02B2 and Re0.98Ru0.02B2, noted as “ReOsB2” and “ReRuB2”) were synthesized via arc-melting from the pure elements. In-situ high-pressure radial x-ray diffraction was performed in the diamond anvil cell to study the incompressibility and lattice strain of ReOsB2 and ReRuB2 up to ∼56 GPa. Both solid solutions exhibit higher incompressibility and differential strain than pure ReB2. However, while all lattice planes are strengthened by doping osmium (Os) into the ReB2 structure, only the weakest ReB2 lattice plane is enhanced with ruthenium (Ru). These results are in agreement with the Vickers hardness measurements of the two systems, where higher hardness was observed in ReOsB2. The combination of high-pressure studies with experimentally observed hardness data provides lattice specific information about the strengthening mechanisms behind the intrinsic hardness enhancement of the ReB2 system.