摘要
以脲为水解试剂,采用强迫水解法制备了(Y,Cd,Cd,Eu)2O3、(Y,Tb)2O3、(Y,Gd,Eu)2O2S和(Y,Tb)2O2S等一系列复合稀土氧化物和硫氧化物超细粉,研究了热分解反应的机理以及产物的结构和性能。
Monodispersed fine spherical particles(~100 nm)of complex rare earth hydroxy carbonates are prepared by hydrolizing mixed rare earth nitrates solution at elevated tempera ture in the presence of urea. By calcining the hydroxycarbonates at moderate temperature,complex rare earth sesquioxides(~70 nm)of C- type can be obtained.The mechnism of the decomposition of hydroxycarbonate at different temperatures have been verified to proceed through monoxydicarbonate, dioxymonocarbonate to sesquioxide of body- Centered structure by DTA,TGA,XRD and HREM. The experimental EDP diagrams of complex rare earth sesquioxides have been identified with those of calculated C-type structure. Complex rare earth oxysulfides of hexagonal structure can be prepared by firing a blend of complex rare earth hydroxycarbonate,S, Na2CO3 and KH2PO4 at 1000℃.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
1995年第5期661-665,共5页
Chemical Journal of Chinese Universities
基金
国家自然科学基金
国家科委基础研究重大项目
关键词
超细粉
稀土氧化物
硫氧化物
水解法
脲
热分解
Superfine particles, Rare earth oxides, Rare earth oxysulfides, Hydrolvsis