Equations of state of new boron-rich selenides B6Se and B12Se

Two novel of boron-rich selenides, orthorhombic B$_6$Se and rhombohedral B$_{12}$Se, have been recently synthesized at high pressure - temperature conditions. Room-temperature compressibilities these phases were studied in a diamond anvil cell using synchrotron powder X-ray diffraction. A fit experimental p-V data by third-order Birch-Murnaghan equation state yielded the bulk moduli 155(2) GPa for B$_{12}$Se 144(3) B$_6$Se. No pressure-induced phase transitions observed range, i.e., up to 35 GPa.