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Boron carbide is a ceramic material with unique properties widely used innumerous, including armor, applications. Its mechanical properties, mechanismof compression, and limits of stability are of both scientific and practicalvalue. Here, we report the behavior of the stoichiometric boron carbide B13C2studied on single crystals up to 68 GPa. As revealed by synchrotron X-raydiffraction, B13C2 maintains its crystal structure and does not undergo phasetransitions. Accurate measurements of the unit cell and B12 icosahedra volumesas a function of pressure led to conclusion that they reduce similarly uponcompression that is typical for covalently bonded solids. A comparison of thecompressional behavior of B13C2 with that of alpha-B, gamma-B, and B4C showedthat it is determined by the types of bonding involved in the course ofcompression. Neither molecular-like nor inversed-molecular-like solid behaviorupon compression was detected that closes a long-standing scientific dispute.

Structural stability and mechanism of compression of stoichiometric B13C2 up to 68 GPa