Numerical analysis in the shock synthesis of EuBa2Cu3Oy

Numerical calculations using two material models, a P-alpha model and the V IR model with and without reaction, were applied for the shock synthesis of EuBa2Cu3Oy. The shock wave was reflected from the back rim of the sample d ue to a faster shock wave velocity in the container than in the sample, ach ieving very high pressure. The temperature calculated in the outer area of the 3-mm-thick sample was higher than that of the center region because of single compression due to Mach reflection. The calculated temperature distr ibution in the 1-mm-thick samples was less remarkable than in the 3-mm-thic k samples. The temperature calculated using the VIR model with reaction was higher than that of the P-alpha model without reaction due to the occurren ce of exothermic reaction. The result of a shock recovery experiment from a 3-mm-thick sample indicated that the yield of EuBa2Cu3Oy phase in the oute r area of the sample was larger than that of the central area. The large yi eld in the outer area was consistent with the result of numerical calculati on. A more-homogeneous temperature distribution achieved in a 1-mm-thick sa mple than in a 3 mm thick sample indicated that the aspect ratio of the sam ple room is important for shock synthesis experiments.