【摘要】 用化学共沉淀法制备了复合氧化物YFeO3镁掺杂固溶体Y1-xMgxFeO3气敏半导体材料，并对其相组成、电导和气敏性能进行了研究．结果表明：Mg2+在YFeO3的A位固溶范围为0≤x≤0.8；电导测量显示，该p型固溶材料电导突变温度较纯相YFeO3低100℃以上；900℃下灼烧4h所得的Y0.94Mg0.06FeO3粉料制作的元件在257℃时对乙醇灵敏度最高，对4．5μmol／L乙醇的灵敏度高达44;选择性较好，4．5μmol／LC2H5OH的灵敏度是45μmol／LPetrol的4．0倍．更多还原

【Abstract】 The paper reports the preparation and the gas-sensing properties of Y1-xMgxFeO3prepared by chemical co-precipitation method. Y2O3, Fe(NO3)3·H2O, Mg(No3)2 and HNO3 were used as starting materials. Y2O3 was dissolved in HNO3 and mixed with Fe(NO3)3 and Mg(NO3)2, solution according to intended ratio, the (NH4)2CO3 solution was dropped into the mixed solution to make Fe+3 Mg2+ and Y3+ coprecipitate. The coprecipitate were washed bydistilled Water, filtered, dried at 100℃, milled and calcined at 900℃ for 4h Mg2+ doping decreases the lattice constants and size of the material- When x<0.8, the curie temperature ofY1-x MgxFeO3 is 100℃ than that of YFeO3 and the conductivity of the sensor based onMgxFeO3 is higher than that of the sensor based on YFeO3. The reason forit is thatMg2+ doping forms Many holes Which can be indicated by the equation MgY →MgY +h.The sensitivity to C2H5OH of the sensor based on Y1-MgxFeO, is higher than that of sensorbased on YFeO3, but the sensitivity to othe gases of the sensor based on Y1-MgFeO3, isalmost equal to that of sensor based on YFeO3 which may be bouse Mg2+ play a cataytic rolein the reaction of C2H5OH oxidation. The sensor besed on Y0.94 Mg0.06FeO3 exhibits highestsensitivity to C2H5OH at 257℃, and S4.5μmol/L C2H5OH/S45μmol/L Petrol≈4.0. It is a promising gas -sensing material.更多还原