On the Hardness of a New Boron Phase, Orthorhombic {\gamma}-B28
V.L. Solozhenko, O.O. Kurakevych, A.R. Oganov

TL;DR
This paper reports the hardness measurement of a newly discovered high-pressure boron phase, orthorhombic γ-B28, which exhibits the highest hardness among all known crystalline boron forms, reaching approximately 50 GPa.
Contribution
It provides the first hardness measurement of the new orthorhombic γ-B28 boron phase, establishing its exceptional hardness.
Findings
γ-B28 has the highest hardness (~50 GPa) among boron crystals.
The new phase's hardness surpasses previous boron modifications.
Abstract
Measurements of the hardness of a new high-pressure boron phase, orthorhombic {\gamma}-B28, are reported. According to the data obtained, {\gamma}-B28 has the highest hardness (~50 GPa) of all known crystalline modifications of boron.
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