摘要
BaTiO_(3) nanoparticles were synthesized by hydrothermal method using amorphous phase TiO_(2) precursor as the Ti-source.The microstructure and phase structure were determined using XRD,SEM and Raman spectroscopy analysis results.The results showed that BaTiO_(3) nanoparticles have tetragonal structure,average size of about 100 nm was obtained at Ba/Ti ratio of 1.5,synthesis temperature of 200℃ and reaction time of 12 h.The components of the BaTiO_(3) lead-free ceramic system are fabricated by conventional solid-phase reaction from the average size BaTiO_(3) particles about 100 nm obtained by hydrothermal process.The effects of sintering behavior on dielectric,ferroelectric and piezoelectric properties of BT high-density ceramic were studied.The BaTiO_(3) ceramic composition sintered at 1300℃ has a relative density of 97%,the value of the electromechanical coefficient kp=0.40,k33=0.42,the large piezoelectric coefficient d_(33)=300 pC/N,d_(31)=−125 pC/N.
基金
This work was carried out in the framework of the National Project in Physics Program until 2020 under No.DTDLCN.10/18(PI:Associate Professor Vo Thanh Tung from University of Sciences,Hue University).
