A study was made of studies of the correlation between the presence and distribution of cation vacancies in doped manganites (La,M)MnO3+δ (where M = Na, Ca) and their magnetic properties. Results indicated that cation vacancies were distributed differently for the different crystal structures and dopant ion type. In particular, it was shown that knowledge of the total vacancies concentration alone was not enough to fully characterize the physical properties of manganites and that their distribution between the A and B sites of the perovskite structure plays a crucial role which should be taken into account in future studies.

Effects of Cation Vacancy Distribution in Doped LaMnO3+δ Perovskites. L.Malavasi, C.Ritter, M.C.Mozzati, C.Tealdi, M.S.Islam, C.B.Azzoni, G.Flor: Journal of Solid State Chemistry, 2005, 178[6], 2042-9