%0 Journal Article
%A Giraldo, David
%A Almodóvar Losada, Paloma
%A López García, María Luisa
%A Rodriguez Aguado, Elena
%A Rodriguez Castellon, Enrique
%A Galdamez, Antonio
%A Álvarez Serrano, Inmaculada
%T Exploring multiferroicity in BiFeO3 - NaNbO3 thermistor electroceramics
%D 2021
%@ 0955-2219
%U https://hdl.handle.net/20.500.14352/113236
%X The BiFeO3 –NaNbO3 electroceramics, synthesized by the ceramic method, are studied aiming to obtain materials with a well-defined thermistor response coexisting with a relevant magnetic response. XRD data and Raman analysis reveal a structural transition as a function of composition. Compositional features explored from ICP, XPS and EDS measurements, suggest compositional heterogeneity leading to a cluster-type scenario implying NNO-rich and BFO-rich regions in the samples. Impedance spectroscopy data reveal the development of a PTCR thermistor response for x ≥ 0.5 near room temperature. The x = 0.9 ceramic shows resistivity changes of about six orders of magnitude in the first thermal cycle and maximum permittivity values of ∼ 105, much higher than those previously reported for BFO-doped ceramics. Magnetization data are interpreted in terms of the stabilization of superparamagnetic clusters. The response displayed by the x = 0.9 ceramic makes it a promising multifunctional material for device applications.
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