Influence factors of textured Bi_0.5Na_0.5TiO_3 ceramics prepared by solvothermal method

Using Bi(NO₃)₃·5H₂O and Ti substrates as raw materials and absolute ethyl alcohol as a solvent,oriented Bi_0.5Na_0.5TiO₃(BNT) ceramics were synthesized by solvothermal method.The phase,micro-mophology and composition of BNT ceramics were characterized by X-ray diffraction(XRD),field emission scanning electron microscopy(FE-SEM) and energy dispersive spectroscopy(EDS).The effects of factors such as NaOH concentration,[Bi³⁺] concentration,surfactants and solvents on the grain phase,micro-mophology and composition of BNT ceramics were systematically studied.The results show that oriented BNT ceramics are successfully obtained when the NaOH concentration,the[Bi³⁺] concentration,the addition of polyethylene glycol(PEG) and the solvent are 1 mol·L^-1,0.1 mol·L^-1,1 to 6 mL and absolute ethyl alcohol,respectively.The average size of the BNT grains is in the range of 10 to 20 μm.