摘要
将溶胶-凝胶法与微波自然烧法相结合,利用微波诱发自燃烧技术一步合成了Bi3.25La0.75Ti3O12(BLT)纳米粉体。根据相关络合反应及其反应平衡常数所进行的理论计算,确定了前驱体溶液的最佳pH值和柠檬酸(CA)/金属离子(M)的物质的量比。分别利用红外光谱(FTIR)、X射线衍射(XRD)和扫描电镜(SEM)对前驱体及合成的纳米粉体进行了表征,结果表明,微波诱发溶胶-凝胶自燃烧法能一步合成具有层状钙钛矿结构的单相BLT纳米粉体。当pH=6、n(CA)/n(M)=2.5以及氧化度Q=80%时,合成的单相BLT纳米粉体的平均晶粒尺寸约为30nm。
Bi3.25La0.75Ti3O12 （BLT） nanopowders have been one-step synthesized via a microwave-assisted sol-gel auto-combustion by combining the sol-gel process and auto-combustion of gels. According to the theoretical analyses of the equilibrium concentrations of species involved in the concerned chelating reactions, the optimum pH value and the molar ratio of citric acids（CA） to metal ions（M） are determined for the sol-gel process. FTIR spectrometer, X-ray diffractometer and scanning electron microscope are used to characterize the precursors and synthesized nanopowders. It is found that single phase BLT nanopowders can be one-step synthesized via microwave-assisted auto-combustion of gels. When the synthetic conditions are pH=6, n（CA）/n（M）= 2. 5, Q= 80%, the obtained nanopowders are loose and composed of uniform particles with an average size of about 30nm.
出处
《材料导报》
EI
CAS
CSCD
北大核心
2010年第12期94-98,共5页
Materials Reports
基金
江苏省高校重点自然科学基金项目(06KJA43008)
