Co_2-W型六角晶系铁氧体的制备和表征  

Preparation and characterization of Co_2-W hexagonal ferrite

作　　者：张跃[1] 王洪涛[1] 刘建武[1] 严生虎[1] 沈介发[1] 

机构地区：[1]江苏工业学院精细化工研究所,常州213164

出　　处：《化工新型材料》2008年第2期63-65,73,共4页New Chemical Materials

基　　金：国家高技术研究发展计划(863计划)2006AA020101

摘　　要：以金属硝酸盐为原料，柠檬酸为络合剂，乙二醇为分散剂，用柠檬酸溶胶-凝胶法制备了CO2-W型六角晶系铁氧体。采用TG-DTA、XRD、SEM研究了样品物相纽成、显微结构和晶化过程。结果表明，煅烧温度低于1200℃时，产物为M晶型的铁氧体；煅烧温度为1250-1300℃时，生成单一的W型铁氧体；温度1350℃时，产物中生成了少量M晶型铁氧体。随着保温时间的延长，W晶型逐渐纯化，保温时间超过5h时，产物中生成了少量M晶型铁氧体。当铁含量为15．1，450℃预处理3h后，在1250-1300℃下煅烧3h，可得到完整的Co2-W型铁氧体。Co2-W type hexagonal ferrite was prepared by sol-gel method with metal nitrate as raw material, citrate as complexing agent and glycol as dispersive agent. TG-DTA, XRD and SEM were used to study the detailed information on the crystallography of the ferrite. The results showed that when calcination temperature was below 1200℃, the product is M-type ferrite. When calcination temperature was 1250-1300℃, the product was single W-type ferrite. A small amount of M-type ferrite is produced while calcination temperature was 1350℃. With extending the sintering holding time, W-type crystal is gradually purified. When holding time was 5h, a small amount of M-type ferrite were produced. Co2-W type ferrite was synthesized at calcination temperature 450℃ for 3h and 1250-1300℃ for 3h when the content of iron was 15. 1,

关 键 词：W型铁氧体 柠檬酸 晶体结构 溶胶-凝胶法 

分 类 号：O614.811[理学—无机化学]