摘要
分别用空气氧化和H2O2氧化沉淀法制得了纳米级α-Fe2O3气陶瓷粉料,对粉体进行了XRD物相分析及晶粒度、晶格畸变率的测定,以TEM观察其形貌并测得了平均粒径,采用迎头色谱法测定其比表面积。结果对照表明,H2O2氧化法制得的粉体粒度更小,而且该法还具有不引入有害杂质,便于共沉掺杂等优点,是更有发展前途的α-Fe2O3基气敏陶瓷粉料制备方法。
?Fe2O3 ultrafine particles for ceramic gas sensors were prepared by two precipitation methods. One uses air as oxidant, the other H2O2. The products have been characterized by XRD and TEM, and their specific surfaces have also been determined by front chromatography. The powder prepared by the latter method has been found to have smaller mean particle size and larger specific area. Furthermore,the latter method has also the advantage that it doesn't bring with impurities harmful to gas-sensitivity and is convenient to be used to dope half-metal elements,e.g. Sn and Sb, through co-precipitation.
基金
福建省科委及省教委资助项目
关键词
α-Fe_(2)O_(3)
纳米粉体
气敏陶瓷
表征
α-Fe_(2)O_(3) ceramic
nanometer-sized powder
gas-sensitive material
characterization