The solvent extraction of La3+ from hydrochloric acid solutions was investigated using bis(2, 4, 4-trimethylpentyl) monothiophosphinic acid(Cyanex 302, HL) as a
Nanometer perovskite LaMnO3+λ, La0.6Ce0.4MnO3+λ and La0.6Sr0.4MnO3+λ were prepared by citric acid-aided sol-gel method. The effects of Ce, Sr on the structur