The sequence of structural phase transitions that occur in distorted ABO3 perovskites as a function of temperature is of intrinsic interest for better understanding of the evolving space group symmetries and also in specific cases for clarifying changes in the physical properties of the materials. Here we plan to study for the first time the high temperature phase transitions of BaPrO3, to identify the precise orthorhombic to tetragonal to cubic symmetry pathway the phase follows and compare it with analogous A2+B4+O3 materials such as BaTbO3, BaPbO3 and BaCeO3. In addition, a parallel study on the acceptor doped phase, BaPr0.9Y0.1O2.95, of interest due to its mixed protonic and hole-type conduction will be performed and the results correlated with impedance data.