Bulk moduli of Cr2GaC and Ti2GaN up to 50 GPa

Using a synchrotron radiation source and a diamond anvil cell, we measured the pressure dependencies of the lattice parameters of two Ga-containing polycrystalline MAX phases: Ti2GaN and Cr2GaC. The bulk moduli were calculated to be 189 ± 4 and 188 ± 5 GPa, respectively. Up to a pressure of about 50 GPa, no phase transformations were observed. Ti2GaN compresses more easily along the c-axis, while Cr2GaC compresses equally in both directions.