Structural phase transition and high-pressure behaviour of curium and uranium monobismuthides Original Research Article

We present the high-pressure behaviour and pressure induced structural phase transition of curium and uranium monobismuthides investigated by using a theoretical model based on the charge transfer effects arising from three body interaction. The calculated compression curves and the values of different high-pressure properties for curium monobismuthides (CmBi) and uranium monobismuthides (UBi) are compared with the experimental results. The accuracy of the present approach is quite successful in reproducing the equation of states and phase transition pressure of CmBi and UBi are in general good agreement with the experimental data. These materials exhibit first order crystallographic phase transition from their NaCl (B1) to CsCl (B2) structure at 12.0 GPa and 4.0 GPa for CmBi and UBi respectively, NaCl structure up to which is found stable.