7th INTERNATIONAL CONFERENCE ON FERRITES

J. Phys. IV France 07 (1997) C1-355-C1-356
DOI: 10.1051/jp4:19971144

EPR and Magnetic Properties of the Ca_nFe₂Mn_n-2O_3n-1 Perovskite Related Series

M.T. Causa¹, M. Tovar¹, R.D. Zysler¹, M. Vallet-Regí², J.M. González-Calbet³ and R.D. Sánchez<sup>4

1</sup>  Centro Atómico Bariloche and Instituto Balseiro, 8400 San Carlos de Bariloche, Argentina
²  Facultad de Farmacia, Universidad Complutense, 28040 Madrid, Spain
³  Facultad de Química, Universidad Complutense, 28040 Madrid, Spain
⁴  Facultad de Física, Universidad de Santiago de Compostela, 15706 Santiago de Compostela, Spain

Abstract
We present EPR and Susceptibility measurements performed on the perovskite-like family Ca_nFe₂Mn_n-2O_3n-1. On going from n=2 to n=3 Fe³⁺ is progressively replaced by Mn⁴⁺. As a consequence the ordering temperature is depressed and frustrations in the magnetic interactions were found. The measurements are compared with the previously studied system Ca_nFe₂Ti_n-2O_3n-1, where magnetic Mn⁴⁺ were replaced by non magnetic Ti⁴⁺. We discuss the results in terms of cationic ordering and super exchange interactions.

© EDP Sciences 1997