In this paper, details of synthesis and structural, morphological, electrical, and magnetic characterization of the new La 0.37 Ca 0.17 Ba 0.43 Mn 0.52 Ti 0.44 Zr 0.04 O 3 multiferroic complex perovskite are reported. Mixtures with 50% mass of ferromagnetic lanthanum calcium manganite La 0.67 Ca 0.33 MnO 3 and ferroelectric barium-lanthanum zirconate titanate Ba 0.9 La 0.067 Ti 0.91 Zr 0.09 O 3 were prepared by the solid state reaction technique. Patterns of X-ray diffraction showed that the materials have reacted resulting in a new perovskite-like structure with tetragonal symmetry, space group P4mm(#99). The structure of the material was refined using the Rietveld method through the GSAS code. ZFC and FC magnetization curves show the occurrence of two phase transitions at 42.25 K and 203.9 K which have been associated with two different magnetic regimes. Hysteresis curves measured confirm that the relationship between the applied field and the magnetization does not evidence a linear behavior. These curves also show that in the low temperature regime the magnetic memory of the material is greater than in the high temperature region. AC impedance as a function of temperature measurements show the same two regions observed in the magnetization curves. The ferroelectric behavior with relative permittivity of 153.12 is observed by polarization curves performed at room temperature in the synthesized materials.
Tópico:
Magnetic and transport properties of perovskites and related materials