高纯四方相BaTiO_3粉体的制备及介电性能研究
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摘要
以八水合氢氧化钡、钛酸四丁酯为原料,采用水热球磨去羟基法制备四方相钛酸钡(BaTiO_3)粉体,研究原料钡钛摩尔比(Ba/Ti)、反应时间、反应温度等因素对四方相BaTiO_3合成的影响,通过XRD、TEM、SEM等测试手段,分析了BaTiO_3的晶相组成、颗粒形貌及其陶瓷介电性能。研究表明,当Ba/Ti比值2.0、反应时间120 h、丁醇与水体积比1:1、反应温度180℃条件下,获得了高纯四方相BaTiO_3粉体,其晶形规整,粉末粒度小,颗粒均匀,分散性良好,用其烧结的陶瓷常温下相对介电常数高达1793,击穿场强达到3.1 kV/mm。
Preparation of tetragonal phase barium titanate(BaTiO_3) powder was carried out by hydrothermal ball milling dehydroxyl method, using barium hydroxide octahydrate and tetrabutyl titanate as raw materials. The effects of molar ratio of raw materials, reaction time and reaction temperature on the synthesis of tetragonal BaTiO_3 were studied. Crystal phase structure, particle morphology and ceramic electrical properties of BaTiO_3 were analyzed by XRD, TEM and SEM. Studies have shown that when the Ba/Ti ratio is 2 : 1, reaction time is 120 h, butanol to water volume ratio is 1 : 1, and the reaction temperature is 180 °C, high-purity tetragonal barium titanate powder with regular crystal form can be obtained. The resulting powder has small particle size, uniform particle size distribution and good dispersibility.The relative dielectric constant of BaTiO_3 ceramic at room temperature is as high as 1,793, and the breakdown field strength is 3.1 kV/mm.
Preparation of tetragonal phase barium titanate(BaTiO_3) powder was carried out by hydrothermal ball milling dehydroxyl method, using barium hydroxide octahydrate and tetrabutyl titanate as raw materials. The effects of molar ratio of raw materials, reaction time and reaction temperature on the synthesis of tetragonal BaTiO_3 were studied. Crystal phase structure, particle morphology and ceramic electrical properties of BaTiO_3 were analyzed by XRD, TEM and SEM. Studies have shown that when the Ba/Ti ratio is 2 : 1, reaction time is 120 h, butanol to water volume ratio is 1 : 1, and the reaction temperature is 180 °C, high-purity tetragonal barium titanate powder with regular crystal form can be obtained. The resulting powder has small particle size, uniform particle size distribution and good dispersibility.The relative dielectric constant of BaTiO_3 ceramic at room temperature is as high as 1,793, and the breakdown field strength is 3.1 kV/mm.
引文
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[3]LU R,YUAN J,SHI H L,et al.Morphology-controlled synthesis and growth mechanism of lead-free bismuth sodium titanate nanostructures via the hydrothermal route[J].Cryst Eng Comm,2013,15:3984-3991.
[4]FU C L,LIAO H,CAI W.Effect of calcination temperature on the microstructures of barium bitanate hafnate nanopowders prepared by the sol-gel process[J].Intergrated Ferroelectrics,2012,139(1):20-25.
[5]CIFTCI E,RAHAMAN M N.Hydrothermal precipitation and characterization of nanocrystalline BaTiO3 particles[J].Journal of Materials Science,2001,36:4875-4882.
[6]陈杰,张晴,车明超.微波辅助草酸盐沉淀法制备四方相BaTiO3纳米粉体[J].人工晶体学报,2017,46(8):1545-1551.CHEN J,ZHANG Q,CHE M C.Journal of Synthetic Crystals,2017,46(8):1545-1551.
[7]冯美,李远亮,王欢欢,等.Fe2O3掺杂对锆BaTiO3陶瓷结构和介电性能的影响[J].陶瓷学报,2016,37(4):378-382.FENG M,LI Y L,WANG H H,et al.Journal of Ceramics,2016,37(4):378-382.
[8]LEE J H,NERSISYAN H H,LEE H H,et al.Structural change of hydrothermal BaTiO3 powder[J].Journal of Materials Science,2004,39:1397-1401.
[9]DESHPANDE S B,GODBOLE P D,KHOLLAM Y B,et al.Characterization of barium titanate:BaTiO3(BT)ceramics prepared from sol-gel derived bt powders[J].Journal of Electroceramics,2005,15:103-108.
[10]曲远方.功能陶瓷及应用.北京:化学工业出版社,2003:164-172.
[11]蒲永平,吴建鹏,陈寿田.钛酸钡粉体四方相的XRD定量分析[J].压电与声光,2004,26(4):341-344.PU Y P,WU J P,CHEN SH T.Piezoelectrics&Acoustooptics,2004,26(4):341-344.
[12]邹晨,金向朝,鲍捷,等.水热法制备四方相钛酸钡纳米粉末的工艺研究[J].绝缘材料,2004,37(2):25-27.ZHOU C,JIN X C,BAO J,et al.Insulating Materials,2004,37(2):25-27.