摘要
用柠檬酸盐法合成出Ｌａ_（１－_ｘ）Ｓｒ_ｘＦｅＯ_３（ｘ＝０．１，０．２，０．３，０．４）原粉，再经固相反应得到纳米晶粉末，用ＴＧ、ＤＴＡ、ＸＲＤ、ＩＲ进行了表征，确证复合氧化物Ｌａ_（１－_ｘ）Ｓｒ_ｘＦｅＯ_３为钙钛矿型结构，粒径在１０～２５ｎｍ之间。实验结果表明，随着固相反应条件不同，产物粒径呈规律性变化．气敏特性研究表明，该纳米晶材料对乙醇有较高的选择性和灵敏度，其选择性顺序为Ｌａ_（０．９）Ｓｒ_（０．１）ＦｅＯ_３＞ＬａＦｅＯ_３＞ＬａＦｅＯ_３（大晶粒）。
Using citrate method,a series of nanocrystalline materials of composite oxides La1-xSrxFeO3(x=0,0.1,0.2,0.3,0.4)were synthesized.These samples were characterized by XRD,IR,TG and DTA.The crystal structure is of perovskite-ype;The grain size is about 10-25 nm,The experimental results show that the grain sizes are related to the composition,calcination temperature and time,and nanocrystalline materials La1-xSrxFeO3(x=0,0.1)possess a high selectivity to ethanol,the order of selectivity is La0.9Sr0.1FeO3>LaFeO3(23nm)>LaFeO3(110nm).
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
1994年第6期803-806,共4页
Chemical Journal of Chinese Universities
基金
国家自然科学基金
关键词
纳米
气敏特性
稀土族
复合氧化物
Nanocrystalline,Perovstite-type,Sensing character
