Shear strength measurements and hydrostatic compression of rhenium diboride under high pressures
| Autor: | Kaleb C. Burrage, Yogesh K. Vohra, Changyong Park |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
010302 applied physics
Diffraction Bulk modulus Materials science General Physics and Astronomy 02 engineering and technology 021001 nanoscience & nanotechnology Compression (physics) 01 natural sciences Rhenium diboride law.invention chemistry.chemical_compound chemistry law 0103 physical sciences Shear strength Deformation (engineering) Hydrostatic equilibrium Composite material 0210 nano-technology Anisotropy |
| Zdroj: | Journal of Applied Physics. 129:205901 |
| ISSN: | 1089-7550 0021-8979 |
| DOI: | 10.1063/5.0050057 |
| Popis: | Shear strength measurements have been carried out on rhenium diboride, ReB2, to a pressure of 74 GPa using a Radial X-ray Diffraction (R-XRD) technique in a diamond anvil cell using platinum as an internal x-ray pressure standard. The R-XRD result has provided a unique insight into the deformation of hexagonal crystal lattice under non-hydrostatic compression and variation of shear strength with increasing pressure. From R-XRD data, we have estimated hydrostatic component of compression to determine an equation of state of rhenium diboride yielding a bulk modulus of K0 = 366 ± 25 GPa with a pressure derivative K 0 ′ = 4.3 ± 0.5 in good agreement with hydrostatic density functional theory calculations. The average lower bound of shear strength (τ) from various diffraction planes was then calculated using the measured interplanar d-spacing (dm) and hydrostatic component of d-spacing (dp) to be shown to approach 6.7 ± 0.4 GPa at 70 GPa. Our results show that the anisotropic compression effects observed in ReB2 under hydrostatic compression are correlated to electronic structure changes under compression as predicted by theoretical calculations. |
| Databáze: | OpenAIRE |
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