Effect of Nb and Mn Substitution on Bi_0.5Na_0.5TiO₃ Lead-Free Piezoceramics with Enhanced Electrical Properties

Abstract:

The perovskite oxide Bi_0.5Na_0.5Mn_xTi_1-xO₃, Bi_0.5Na_0.5Nb_xTi_1-xO₃, Bi_0.5Na_0.5 (Mn_0.5Nb_0.5)_xTi_1-xO₃ and Bi_0.5Na_0.5TiO₃ ceramics (x=0.25%) were prepared via the conventional solid state reaction method. The role of Mn as an acceptor, Nb as a donor and (Mn_0.5Nb_0.5) substitution at B site in BNT lead-free piezoceramics was investigated. The (Mn_0.5Nb_0.5) substitution led to the inhibited of reduction of Ti⁴⁺ to Ti³⁺ and gave rise to large defect-dipole clusters containing highly localized electrons which should be responsible for the increase of T_c and T_d. The ferroelectric properties and field-induced strains were both improved by Mn-acceptor and (Mn_0.5Nb_0.5) co-doped. The fatigue-resistant properties of Nb doped BNT ceramics were comparable to BNT ceramics, Mn doped ceramics were found to have significantly improved fatigue-resistant properties, while almost no profound fatigue was observed in BNT-MnNb ceramics after switching over 10⁶ cycles at room temperature.

• Periodical: Applied Mechanics and Materials (Volume 863)
• Pages: 8-14
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.863.8
• Online since: February 2017
• Authors: Yu Chen Guo*, Hui Qing Fan, Jing Shi
• Keywords: Defect Diploe, Fatigue Properties, Ferroelectric Properties, Lead-Free Piezoelectrics

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