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.
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