High pressure study of Ti_4AIN_3 to 55 GPa

摘要

Using a synchrotron radiation source and a diamond anvil cell, we measured the pressure dependence of the lattice parameters of a polycrystalline Ti_4AlN_3 sample up to a pressure of 55 GPa. No phase transformations were observed. As observed in Ti_3SiC_2, Ti_3Si_(0.5)Ge_(0.5)C_2, and Zr_2InC, the compressibility of Ti_4AlN_3 along the c axis was larger than along the a axis which leads to a decrease in the c/a ratio with increasing pressure. The bulk modulus is 216±2 GPa, with a pressure derivative of 3.84±0.06.