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oai:docta.ucm.es:20.500.14352/1132362025-03-18T13:10:47Zcom_20.500.14352_14col_20.500.14352_15

Giraldo, David Almodóvar Losada, Paloma López García, María Luisa Rodriguez Aguado, Elena Rodriguez Castellon, Enrique Galdamez, Antonio Álvarez Serrano, Inmaculada 2025-01-08T11:39:42Z 2025-01-08T11:39:42Z 2021-07-24 D. Giraldo, P. Almodóvar, M.L. López, E. Rodríguez-Aguado, E. Rodríguez-Castellón, A. Galdámez, I. Álvarez-Serrano, Exploring multiferroicity in BiFeO3 - NaNbO3 thermistor electroceramics, Journal of the European Ceramic Society, 41, (14), 2021, 7069-7076 0955-2219 10.1016/j.jeurceramsoc.2021.07.045 https://hdl.handle.net/20.500.14352/113236 https://doi.org/10.1016/j.jeurceramsoc.2021.07.045 https://www.sciencedirect.com/science/article/pii/S095522192100515X 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. eng http://creativecommons.org/licenses/by-nc-nd/4.0/ open access Attribution-NonCommercial-NoDerivatives 4.0 International Exploring multiferroicity in BiFeO3 - NaNbO3 thermistor electroceramics journal article