Effect of fabrication routes on the properties of Mn-doped BaTi ₂O₅ ceramics

In the present study, 0, 0.2, and 0.4wt% MnO₂ doped BaTi ₂O₅ ceramics were fabricated by three different routes, i.e., sol-gel deriving powders and spark plasma sintering (SPS) sintering, solid state calcining and SPS sintering, sol-gel deriving powders and two times sintering. Only through the sol-gel technique and conventional sintering route, Mn could substitute for Ti as the acceptor doping and consequently caused the sharp drop of the Curie temperature as well as the enhanced dielectric constant and restricted ferroelectricity. Besides, the 0.2wt% MnO₂ doped BaTi₂O₅ ceramics fabricated by sol-gel deriving powders and SPS sintering exhibited the most superior dielectric and ferroelectric properties.