采用共沉淀并加法制备了Ｂ位掺杂烧绿石型稀土复合氧化物纳米微晶Ｙ２Ｓｎ２－ｘＦｅｘＯ７－δ（ｘ＝００～１０）。制备的纳米微晶属于立方晶系，Ｆｄ３ｍ，晶胞参数与掺杂量呈线性关系。通过Ｍｓｂａｕｅｒ、ＴＧＤＴＡ，气相色谱和γ射线辐照等技术研究了纳米微晶对ＣＯ的催化选择性能。结果表明，纳米微晶对ＣＯ的催化选择性明显高于一般粉料对ＣＯ的选择性；纳米微晶对ＣＯ的选择性与掺杂量有关；未辐照的纳米微晶，当掺杂量ｘ＝０６时，其对ＣＯ的选择性为最高，辐照后的纳米微晶，当掺杂量ｘ＝０４时，其对ＣＯ的选择性为最高 The co-precipitation and addition of B-doped pyrochlore rare earth complex oxide nanocrystalline Y2Sn2-xFexO7-δ (x = 0  0 ~ 1  0). The prepared nanocrystallites belong to the cubic system, Fd3m, the unit cell parameters and the doping amount has a linear relationship. The catalytic selectivity of nanocrystals for CO was studied by Msbauer, TGDTA, gas chromatography and γ-ray irradiation. The results show that the catalytic selectivity of CO to nano-crystallites is obviously higher than that of CO. The selectivity of CO to nano-crystallites is related to the amount of doping. When the amount of doping When x = 06, the selectivity to CO is the highest. The irradiated nanocrystals show the highest CO selectivity when the doping amount is x = 0.4