Cation distribution and magnetic ordering evolution study on Ca1+xCu3-xTi4O12 (x = 0.0–0.2) perovskites

Abstract Ca1+xCu3-xTi4O12, x = 0.0, 0.1, 0.2, quadruple perovskite system has been investigated by means of energy dispersive analysis of X-rays, powder X-ray diffractometry, scanning electron microscopy, dc magnetization in zero-field and field-cooled modes (M(T) curves) and isothermal magnetization against magnetic field (M(H) loop) plots. The stoichiometric samples possess a single-phase crystal structure and coarse-grained microstructure. The cation distributions reveal that substituted Ca2+ ions have a strong preference for Aʹʹ - site. The M(T) curves of pristine composition exhibit reversible thermomagnetic characteristic with classic antiferromagnetic transition at TN ∼ 25 K. On Ca2+ substitution, the compositions (x = 0.1 and 0.2) show coexistence of weak ferromagnetism and antiferromagnetism for T