Superhard Phases of Simple Substances and Binary Compounds of the B-C-N-O System: from Diamond to the Latest Results (a Review)

Abstract

The basic known and hypothetic one- and two-element phases of the B-C-N-O system (both superhard phases having diamond and boron structures and precursors to synthesize them) are described. The attention has been given to the structure, basic mechanical properties, and methods to identify and characterize the materials. For some phases that have been recently described in the literature the synthesis conditions at high pressures and temperatures are indicated.

Review on superhard B-C-N-O phases

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• Comparison of solid state crystallization of boron polymorphs at ambient and high pressures
• Thermoelastic Equation of State of Boron Suboxide B6O up to 6 GPa and 2700 K: Simplified Anderson-Grüneisen Model and Thermodynamic Consistency
• Thermoelastic equation of state of boron subphosphide B12P2
• Phase boundary between Na-Si clathrates of structures I and II at high pressures and high temperatures
• Structure and equation of state of tetragonal boron subnitride B50N2
• On the crystal lattice parameters of graphite-like phases of the B-C system
• Physical properties of new MAX phase borides M2SB (M = Zr, Hf and Nb) in comparison with conventional MAX phase carbides M2SC (M = Zr, Hf and Nb): Comprehensive insights
• Discovering Superhard B-N-O Compounds by Iterative Machine Learning and Evolutionary Structure Predictions
• Synthesis of ultra-incompressible sp3-hybridized carbon nitride
• Physical properties of predicted MAX phase borides Hf2AB (A = Pb, Bi): a DFT insight