Experimental Studies of Hugoniot for Powder Mixture of BaCO3 and TiO2 and Shock Wave Synthesis of BaTiO3

Hugoniot data for powder mixture of BaCO3 and TiO2 have been measured in the range 10 to 100 GPa according to impedance match principle using chemical explosive driven shock wave and flash gap slit sweeping photography of high speed rotating mirror camera. Recovery experiments with axial symmetric and planar configurations and X-ray diffraction of recovered sample in order to examine shock synthesis of BaTiO3 have conducted as well. Measured Hugoniot curves show obvious discontinuities at about 30 and 45 GPa. Hugoniot data combined with X-ray diffraction analyses show that those discontinuities correspond to the phase transition of TiO2 in the mentioned mixture from the anatase to the -TiO2 phase and synthesized BaTiO3 reaction between BaCO3 and TiO2, respectively. Moreover, X-ray diffraction analyses of recovered samples using ammonium nitrate charge indicate that the very complete transition of TiO2 from the anatase phase to the rutile phase occurred.