Abstract
Doped LaCrO3 has been widely concerned because of its rich physical properties and application potential. The effect of Ca doping on crystal structure and magnetic properties of LaCrO3 was investigated here. Parent phase LaCrO3 and La0.67Ca0.33CrO3 were firstly synthesized in air at different sintering temperature (900 ~ 1500 ℃) to study the phase formation process, before synthesizing a series of La1-xCaxCrO3 (0 ≤ x ≤ 0.5) samples. It was not until the sintering temperature was increased to 1400 ℃ for LaCrO3 that the raw material completely reacted to form single-phase samples. For La0.67Ca0.33CrO3, with the increase of sintering temperature, Ca began to enter the lattice of LaCrO3 (950 ℃), La0.67Ca0.33CrO3 phase with a small amount of unreacted Cr2O3 formed (1050 ℃), and single-phase La0.67Ca0.33CrO3 formed (1200 ℃) successively. A series of single phase La1-xCaxCrO3 samples with x = 0 ~ 0.5 were obtained by sintering at 1400 ℃. Their crystal structure was characterized by X-ray diffraction and refined. Magnetization measurements indicated that magnetic transition temperature was persistently suppressed with increasing Ca doping content, and the magnetic structure below transition temperature has undergone significant changes.