摘要
采用溶胶-凝胶法,用EDTA和柠檬酸作为两种不同的络合剂,分别对复合相中成份Nd和Fe进行络合,再合并溶液后,加热成胶,利用乙二醇作为分散剂,选择适当的焙烧温度,经高温压片焙烧法使原来的独立的Fe2O3相和NdFeO3相产生交换耦合作用,从而达到两相耦合的目的.利用X光衍射仪(XRD)和振动样品磁强计(VEM)对纳米晶的结构和磁性能进行了研究,利用差热量热仪(TG-DTG)和红外光谱分析仪(IR)对焙烧情况进行了分析.当热处理温度小于500℃时,样品存在复相NdFeO3/Fe2O3,薄片样品的比饱和磁化强度Sδ为75.9 emu/g,内禀矫顽力Hc,j为6 400 oe,最大磁能积(BH)m ax为1.87MGoe,而粉末样品相应的比饱和磁化强度Sδ为75.6 mu/g,内禀矫顽力Hc,j为6 015 oe,最大磁能积(BH)m ax为1.52MGoe.
Sol-gel method was used to prepare NdFeO3/Fe2 03 Compesite. Ethylene diamine tetra acetic acid （EDTA） and citric acid are used to complex Nd and Fe respectively. Mixing these two solutions with glycol as dispersant agent, the solution become gel during heating When the gel is anealed at appropraite temperature after pressing, an exchange couple effect is created between the two individual phases（ NdFeO3/Fe2O3 ）, and a high magnetic energy is achieved. X-ray diffratometer （XRD） and vibrating sample magnetometer （VSM） are used to study the materieal, and the annealing process is analyzed by Infra-red spectrum （IR） and DTA. When annealing below 500℃, the sample with high magnetic properties, for pressed disc δs = ：75.9 emu/g, Hc,j = 6 400 oe, （BH） max = 1.87 MGoe, However, for the powder pattern at the same condition,δs =75.6 emu/g,Hc,j =6 015 oe,BHmax = 1.52 MGoe.
出处
《大连铁道学院学报》
2005年第4期81-85,共5页
Journal of Dalian Railway Institute
关键词
双络合剂
压片
交换耦合
double complexing agents
pressed disc method
exchange coupled
