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New boron subnitride B50N2 has been synthesized by crystallization from theB-BN melt at 5 GPa, and its structure has been refined using Rietveld analysis.B50N2 crystallizes in the tetragonal space group P-4n2 with unit cellparameters a = 8.8181(2) A and c = 5.0427(10) A. Quasi-hydrostatic compressionof two boron subnitrides, B50N2 and B13N2, has been studied to 30 GPa at roomtemperature in a diamond-anvil cell using synchrotron X-ray diffraction. Nopressure-induced phase transitions have been observed. A fit of experimentalp-V data to the Murnaghan equation of state yielded B50N2 and B13N2 bulk moduliof 167(2) and 205(2) GPa, respectively, with fixed first bulk modulus pressurederivative of 4.0.

Structure and equation of state of tetragonal boron subnitride B50N2