PZT-like structural phase transitions in the BiFeO3-KNbO3 solid solution

Despite the high prominence of the perovskites BiFeO3 and KNbO3 the solid solution between the two has received little attention. We report a detailed neutron and synchrotron x-ray powder diffraction, and Raman spectroscopy study which demonstrate an R3c → P4mm → Amm2 series of structural phase transitions similar to that exhibited by the PbZrO3 – PbTiO3 solid solution