The effects of the vacancy at the B sites on the structural and magnetic properties of perovskite manganites with a nominal composition La0.75Sr0.25Mn1−xO3 (0.0 ≤  x ≤ 0.13), prepared by the sol-gel method, were investigated. X-ray diffraction patterns indicate that there was a ABO3 perovskite structure single phase in the samples with x ≤ 0.08; however, there were second and third phases containing La, except ABO3 perovskite phase, in the samples with x ≥ 0.10. Magnetic measurement indicates that the sample with x = 0.08 has the lowest Curie temperature. Using a quantitative phase analysis, it was deduced that there was a maximum value of vacancy content at the B sites in ABO3 perovskite manganites.

Investigation on the Maximum Content of Vacancy at the B Sites in La0.75Sr0.25Mn1-xO3 Perovskite Manganites. D.H.Ji, G.D.Tang, Z.Z.Li, Q.J.Han, X.Hou, R.R.Bian, S.R.Liu: Journal of Applied Physics, 2012, 111[11], 113902