Impedance behaviors under high pressure for DyFeO3 orthoferrite

An alternate current impedance spectrum up to 32.2 GPa was investigated to reflect the electrical properties of DyFeO3, where space charge plays the crucial role. Conductivity behaviors are determined by a universal dynamic response relationship. The band structure under various pressures was calculated by a density functional theory. The state density of d-shell electrons in conduction band varies with band gap, the reduction of which weakens the p-d coupling and leads to a conductivity transformation in the electrical transport process of O-phase. This work claims a reasonable electrical model for RFeO3 family, which is essentially impacted by high pressure.