Decomposition behavior and dielectric properties of Ti-doped BiFeO_3 ceramics derived from molten salt method

摘要

The effects of Ti-doping on the decomposition behavior, crystal structure, sintering behavior and dielectric properties have been investigated for the Ti-doped BiFeO_3 ceramics derived from molten salt method. XRD reveals the almost pure phase BiFeO_3 is synthesized in the Ti-doped BiFeO_3 powders. And the particle size of Ti-doped BiFeO_3 powers obviously decreases with the increase of Ti content. However, the sintering temperature elevates significantly after Ti-doping. The DC resistivity can enhance by up to four orders of magnitude (from 10~4 to 10~8 flm) with only 5 at% Ti doping. But the dielectric constant is suppressed from 10~4 to 10~2, and dielectric loss obviously reduces with a small amount of Ti doping. The variation of dielectric properties has been discussed from the decomposition of BiFeO_3 phase. The Ti-doping can effectively suppress the decomposition reaction in Ti-doped BiFeO_3 ceramics.