Preparation of Barium Strontium Titanate Nanopowders Using Molten Salt Assisted and Its Dielectric Properties
TANG Zili1, XIA Junsong1, YIN Hang1, FU Guanghui1, AI Xitong1, TANG Hailong1,2
1 College of Materials Science and Engineering, Chongqing University of Technology, Chongqing 400054, China 2 Chongqing Key Laboratory of Mold Technology, Chongqing 400054, China
Abstract: Barium strontium titanate (Ba1-xSrxTiO3,x=0.1,0.33,0.5,0.74,0.8) nanopowders were synthesized by adjusting the molar ratio of barium to strontium via simple sol-precipitation method combined with heat treatment with molten salt. The morphology, structure and dielectric pro-perties of Ba1-xSrxTiO3 were characterized by scanning electron microscope (SEM), X-ray diffractometer (XRD) and dielectric constant tester. The results reveal that the Ba1-xSrxTiO3 nanopowders show a well-defined perovskite crystal structure and square or spherical morphology with average size of 70—100 nm. Moreover, Ba0.9Sr0.1TiO3 and Ba0.67Sr0.33TiO3 exhibit a tetragonal perovskite structure. The dielectric constant and dielectric loss of Ba0.67Sr0.33TiO3 at 1 kHz reach 1 680 and 0.043 respectively, and the curie temperature is 27.3 ℃.
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2022, Vol. 36 
