Pressure dependent ultrasonic characterization of nano-structured w-BN

The work includes evaluation of elastic constants of wurtzite Boron nitride (w-BN) at different particle-size (5-40 nm) and pressure (0-60 GPa) at 300 K using potential model approach. Size and pressure dependent thermo-physical and ultrasonic parameters are also calculated using evaluated elastic constants. It is found that the elastic constants, ultrasonic velocities and Debye temperature of nanostructured w-BN enhance with increase in pressure and reduction in particle size. The size variation of thermal relaxation time resembles the dependency of thermal conductivity with size. The thermal conductivity of nanostructured w-BN is found to increase with reduction in nanoparticle size.