BiFeO 3 powder was synthesized in NaCl media at temperature range from 700 to 800°C, using Bi 2 O 3 and Fe 2 O 3 as raw materials. Effects of calcining temperature and salt ratios on the synthesis of BiFeO 3 powder had been investigated. It was found that NaCl effectively promoted the formation of BiFeO 3 . Almost pure BiFeO 3 phase with a very small amount of Bi 2 Fe 4 O 9 phase was synthesized at 750°C with salt weight ratios of 1:1. A large amount of BiFeO 3 phase decomposed to Bi 2 Fe 4 O 9 and Bi 25 FeO 39 phase when the temperature was up to 800°C. In the present method, the calcining temperature played an important role in the formation of BiFeO 3 phase. BiFeO 3 ceramics derived from molten salt method were prepared and exhibited the higher dielectric constant.

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 Tidoped 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 Xm) 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.