以溶剂热的方法制备纳米四方相钛酸钡粉体,通过改变反应时间、前驱物钡钛摩尔比 n (Ba)/n (Ti)来调控粉体的粒径大小、粒度分布和四方相结晶度.BET 比表面积、激光粒度分析、SEM、XRD、FT-IR 测试结果表明,延长反应时间可减少钛酸钡粉体—OH含量,四方相结晶度有所提高,粉体粒径随之变大,粒度分布变宽；随着 n (Ba)/n (Ti)的提高,钛酸钡粉体—OH 含量相应减少,粉体颗粒尺寸呈先增大后减小的趋势,但基于“尺寸效应”,粉体四方相结晶度并未因—OH 含量的减少而线性增大.当反应时间为1 h,n (Ba)/n (Ti)为2．5时,合成钛酸钡粉体粒径小、粒度分布较窄且具有较高的四方相结晶度,适用于制备小于2μm 瓷膜的 MLCC.
Tetragonal BaTiO 3 nanopowders have been prepared by solvothermal method,the tetragonality,par-ticle size and distribution of as-prepared BaTiO 3 particles were optimized by adjusting soaking time and molar ratio of precursors n (Ba)/n (Ti),The characterization of specific surface area,laser particle size,SEM,XRD and FT-IR indicated that prolonging soaking time could reduce the content of —OH,leading to enhance the tet-ragonality of as-prepared BaTiO 3 nanopowders,meanwhile the particle size and distribution became larger.With n (Ba)/n (Ti)increasing,the particle size first increased and then decreased,correspondingly the content of—OH became lower,but because of size effect the tetragonality did not present a tendency of linear increase due to less content of —OH.The BaTiO 3 nanopowders synthesized in the condition of 1 h soaking time and n (Ba)/n (Ti)=2.5 was suitable for preparing MLCC consisted of less than 2 μm ceramic tape due to small particle size, narrow distribution and high tetragonality.
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