采用溶胶-凝胶法制备了尖晶石型铁氧体CoFe2-xCrxO4的系列样品,通过XRD、SEM对纳米颗粒的结构、形貌进行了表征.结果表明,所合成的样品均为尖晶石型,只是最高衍射峰的位置发生偏移,使得样品的结构从正交晶系向单斜晶系转变;未掺杂样品CoFe2O4的形貌呈立方颗粒状,粒径均匀,边长约为1μm,掺杂后的样品CoFeCrO4颗粒为圆球状,尺寸为100～200nm,且有明显团聚现象.通过测定样品对甲基橙的降解情况研究了其光催化活性,结果表明,经过B位Cr3+掺杂的CoFe2-xCrxO4样品,光催化活性明显提高.%CoFe2-xCrxO4 ferrite with spinel structure were synthesized by sol-gel method The size, structure and appearance of the synthesized nanoparticles were characterized by XRD and SEM The results show that the as-prepared CoFe2-xCrxO4 have unadulterated spinel structure,just position of tiptop diffract apex shift,demonstrating structure transition from ortnorhombic to monoclinic. The morphologies of unadulterated CoFezO4 are cubic grain and dispersive with the average sire about 1μm in diameter. The morphologies of adulterated CoFeCrO4 are pellet grain with the average size about 100nm to 200nm, appear obvious reunite phenomenoa The photocatalytical activity of CoFe2-xCrxO4 samples was measured by the degradation of methylic orange, the results show that the B-site doping can improve the photocatalysis activity of CoFe2-xCrxO4.
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