2026-06-26T09:40:20Zhttps://docta.ucm.es/rest/oai/request

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

Exploring multiferroicity in BiFeO3 - NaNbO3 thermistor electroceramics Giraldo, David Almodóvar Losada, Paloma López García, María Luisa Rodriguez Aguado, Elena Rodriguez Castellon, Enrique Galdamez, Antonio Álvarez Serrano, Inmaculada 546 Dielectrics Sodium niobate Bismuth ferrite PTCR Multiferroics Ciencias 23 Química 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. Ministerio de Economía, Comercio y Empresa Ministerio de Ciencia, Innovación y Universidades Universidad Complutense de Madrid Junta de Andalucía Depto. de Química Inorgánica Fac. de Ciencias Químicas TRUE pub 2025-01-08T11:39:42Z 2025-01-08T11:39:42Z 2021-07-24 journal article VoR https://hdl.handle.net/20.500.14352/113236 0955-2219 10.1016/j.jeurceramsoc.2021.07.045 eng UMA18-FEDERJA-126 RTI2018-099668-BC22 MAT2017-84118-C2-2-R 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 Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/ open access application/pdf Elsevier