Temperature dependence of dielectric properties for BFO-BTO-BZT ceramics

In this work, bismuth ferrite-barium titanate-barium zirconate titanate (BFO-BTO-BZT) ceramics were prepared using conventional solid state reaction method. The (1-x)BiFeO 3 -xBaTiO 3 at x = 0.24-0.30 and Ba(Zr,Ti)O 3 (Zr = 0.5) systems were separately prepared and calcined at 800 and 1250 o C, respectively. All pallets were sintered at temperature of 1100 o C. After that, the relationship between phase formation, dielectric and magnetic properties were examined. The XRD patterns revealed that more structural symmetry could be observed in all single-phase perovskite ceramics when more BTO concentration was added. The 0.75(0.70BFO-0.30BTO)-0.25BZT ceramic showed highest dielectric constant with high loss measured at low frequency observed, possibly due to space charges, interfacial and dipolar polarizations. The temperature-dependent dielectric properties of BFO-BTO-BZT solid solutions were measured in T N temperature range. It was found that the addition of BTO content affected the position of T N .  Especially, the BFO-BTO-BZT solid solutions successfully improved the magnetic properties of BFO-BTO with typical ferromagnetic hysteresis loops. The maximum M r with 0.1632 emu·g -1 was observed in 0.75(0.72BFO-0.28BTO)-0.25BZT sample.