J. Anthoniappen, Chi-Shun Tu, Cheng-Sao Chen, Pin-Yi Chen, Y.U. Idzerda
(Bi0.5Na0.5)0.925Ba0.075(Ti1-xMnx)O3 (x=0, 0.2, 1.0, and 2.0 mol%) ceramics were prepared by solid-state-reaction method to study dielectric, ferroelectric, and depolarization properties. The manganese (Mn) doping can suppress dielectric permittivity and increase relaxor behavior. Coercive field (Ec) increases, while remanent polarization (Pr) decreases as the Mn content increases. Pr exhibits discontinuous anomalies as a function of temperature in all compositions, implying a polarization reorganization of local domains. The depolarization temperature (Td) reaches the highest value (∼152 °C) in 0.2%Mn, and decreases as MnO2 content increases. The increased Td in 0.2%Mn is due to two-phase coexistence and structural thermal stability induced by Mn ions. This work suggests that the moderate Mn doping can enhance Td in lead-free piezoceramics for applications at elevated temperatures. © 2016 Elsevier Ltd and Techna Group S.r.l. All rights reserved
Department of Physics, University of San Carlos, Talamban Campus, Talamban, Cebu City, 6000, Philippines; Department of Physics, Fu Jen Catholic University, New Taipei City, 24205, Taiwan; Department of Mechanical Engineering, Hwa Hsia University of Technology, New Taipei City, 23567, Taiwan; Department of Mechanical Engineering, Ming Chi University of Technology, New Taipei City, 24301, Taiwan; Department of Physics, Montana State University, Bozeman, 59717, MT, United States
