Add time:08/11/2019         Source:sciencedirect.com

Based on in situ synchrotron X-ray diffraction experiments employing laser heated diamond anvil cells to investigate the reaction of rhenium and boron from the elements at high-(p, T) conditions, Re7B3 was found to be extremely incompressible, with BRe7B3=435(14)GPa, making it one of the least compressible binary compounds known to date. We also have determined the previously unknown bulk modulus of Re3B, BRe3B=320(15)GPa, and have confirmed earlier reports of the bulk modulus of ReB2, BReB2 = 360(18) GPa. The experimental findings were supported by density functional theory calculations, which were also employed to compute elastic stiffness coefficients and estimates for the hardness. At different high-(p, T) conditions the formation of new phases were observed.

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