Effect of Ionic Radii Variation on the Structural, Electrical, Dielectric, and Magnetic Characteristics of Orthochromite RCrO3 (R = La, Y, Gd)

A brief review on rare-earth chromites: synthesis, properties and applications

“…Furthermore, it was shown that the parameters of the radius of the R ion and the value of covalency of the Cr-O bond differ across these series. These interactions between the 3d and 4f electrons exhibit that the R-O covalency increases, whereas the Cr-O covalency reduces down the rare earth series [131,136]. As in the GdCrO 3 compound, both Gd 3+ and Cr 3+ are magnetic in nature, three distinct types of interactions arise: Cr-Cr, Cr-Gd, and Gd-Gd, ranked from strongest to weakest.…”

“…Lanthanum chromites (LaCrO 3 ) have been reported to demonstrate higher electronic and lower ionic conductivity, highly stable in both reducing and oxidizing ambience resulting from the quick flow of cations at grain boundaries of crystals, high mechanical strength, highly corrosion resistive, high thermal expansion due to orthorhombic to rhombohedral phase transition [131,178]. Structural distortion and deformities lead to various interesting properties in these chromites.…”