Preparation and Properties of Metallic, Superhard Rhenium Diboride Crystals
- 18 November 2008
- journal article
- Published by American Chemical Society (ACS) in Journal of the American Chemical Society
- Vol. 130 (50), 16953-16958
- https://doi.org/10.1021/ja804989q
Abstract
Single crystals of ReB2 have been prepared from an aluminum flux under inert gas flow. The crystals are typically 1−3 mm in diameter and 500 μm thick, growing along the [002] direction with a distinct hexagonal morphology. Vickers microhardness and nanoindentation testing indicate that the (002) plane possesses the highest hardness with measured values of 40.5 and 36.4 GPa, respectively. The elastic anisotropy was examined and the indentation moduli of the basal plane and an (hk0) plane of unknown indices are 675 and 510 GPa, respectively. Four-probe electrical resistivity measurements demonstrate that ReB2 is the hardest material known to exhibit metallic behavior. Thermogravimetric analysis indicates that the crystals are stable in air up to 1000 °C due to the formation of a protective boron oxide coating.This publication has 33 references indexed in Scilit:
- Superhard Rhenium Diboride Films: Preparation and CharacterizationChemistry of Materials, 2008
- Mechanical and electronic properties of superhardPhysical Review B, 2007
- Synthesis of Ultra-Incompressible Superhard Rhenium Diboride at Ambient PressureScience, 2007
- Low-compressibility and hard materialsand: Prediction from first-principles studyPhysical Review B, 2006
- Osmium Diboride, An Ultra-Incompressible, Hard MaterialJournal of the American Chemical Society, 2005
- Superconductivity at 39 K in magnesium diborideNature, 2001
- Material properties of titanium diborideJournal of Research of the National Institute of Standards and Technology, 2000
- The high-temperature hardness of ZrB2 and HfB2Journal of the Less Common Metals, 1974
- Strength, Fracture Mode, and Thermal Stress Resistance of HfB2and ZrB2Journal of the American Ceramic Society, 1969
- The crystal structure of rhenium diborideActa Crystallographica, 1962