Shear strength measurements and hydrostatic compression of rhenium diboride under high pressures

Journal Article · 24 May 2021 · Journal of Applied Physics

DOI: https://doi.org/10.1063/5.0050057 · OSTI ID:1813044

Burrage, Kaleb C.  ^[1]; Park, Changyong  ^[2]; Vohra, Yogesh K.  ^[1]

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1. Univ. of Alabama, Birmingham, AL (United States)
2. Argonne National Lab. (ANL), Argonne, IL (United States)

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. Here, the average lower bound of shear strength (τ) from various diffraction planes was then calculated using the measured interplanar d-spacing (d_m) and hydrostatic component of d-spacing (d_p) 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.

• Research Organization: Argonne National Laboratory (ANL), Argonne, IL (United States)
• Sponsoring Organization: National Science Foundation (NSF); USDOE; USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division
• Grant/Contract Number: AC02-06CH11357
• OSTI ID: 1813044
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 20 Vol. 129; ISSN 0021-8979
• Publisher: American Institute of Physics (AIP)Copyright Statement
• Country of Publication: United States
• Language: English