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- W2013986101 abstract "Electrical properties of Nb-(Fe, Mn)-codoped BaTiO3 ceramics showing a positive temperature coefficient of resistivity (PTCR) were studied by combining their diffuse reflectance measurements and electron spin resonance (ESR) spectroscopy. Nb-(Fe, Mn)-codoped samples, especially the Nb-Fe-codoped sample showed higher durability to reducing atmosphere than the single Nb-doped ones. It is assumed that Fe ions easily segregated at grain boundaries and contributed to the density of surface acceptor states, meanwhile localizing electrons in a form of Ti3+ balanced by oxygen vacancy which might stabilizing the chemisorbed oxygens. Mn and Fe acceptors still maintained their valence states and high ability of trapping electrons in the grain boundary after annealing. In addition, ESR signals of Fe3+ and Mn2+ in annealed samples were intensified above Curie temperature (Tc), indicating their close correlation with the phase transition from ferroelectric tetragonal to paraelectric cubic." @default.
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- W2013986101 modified "2023-10-02" @default.
- W2013986101 title "Durability of Nb-(Fe, Mn)-Codoped PTCR BaTiO<sub>3</sub> Ceramics to Reducing Atmosphere" @default.
- W2013986101 doi "https://doi.org/10.2109/jcersj.106.470" @default.
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