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Ba-induced lattice distortion and charge transport modulation in GdCrO3 orthochromites
Authors: El Heda, I.; Gneber, M.Y.; Dhahri, A.; Dhahri, R.; Dhahri, E:; Costa, B.F.O.
Ref.: Ceram. Int. 52(12), 20346-20355 (2026)
Abstract: In this, work we studied the effect of barium doping on the structural, morphological, electrical, and dielectric properties of the orthorhombic perovskite-structured compound GdCrO3. The compound Ba0.3Gd0.7CrO3 was synthesized using the sol-gel method followed by a series of thermal treatments. X-ray diffraction confirmed an orthorhombic Pbnm-type structure, with good crystallinity and a low presence of a secondary phase (BaCrO3). SEM analysis revealed a homogeneous grain microstructure, and EDX mapping confirmed the presence and uniform chemical distribution of all elements. Electrical measurements showed a thermally activated semiconductor behavior, modelled by Jonscher´s law. The conduction mechanism is dominated at high temperatures by the small polaron hopping (SPH) model and at low temperatures by the variable range hopping (VRH) model. Electric modulus analysis highlighted a reduction in electrode polarization and an improvement in carrier mobility with increasing temperature. Dielectric studies revealed a strong frequency and temperature dependence of permittivity, indicating thermally activated relaxation mechanisms. These results highlight the potential of Ba-doped GdCrO3 for use in multifunctional electronic devices.
