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Studies on Conductance and Gas-sensing Properties of Y1-xMgxFeO3
Ge Xiutao,Chu Xiangfeng,Liu Xingqin
Author NameAffiliation
Ge Xiutao Department of Chemistry,Chuzhou Normal College,Chuzhou 239012 
Chu Xiangfeng Department of Materials Science and Engineering,University of Science and Technology of China,Hefei 230026 
Liu Xingqin Department of Materials Science and Engineering,University of Science and Technology of China,Hefei 230026 
Abstract:
The paper reports the preparation and the gas-sensing properties of Y1-xMgxFeO3 prepared by chemical co-precipitation method.Y2O3,Fe(NO3)3·H2O,Mg(NO3)2and 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 Fe3+,Mg2+and Y3+ coprecipitate.The coprecipitate were washed by distilled water,filtered,dried at 100℃,milled and calcined at 900℃for 4h Mg2+ doping decreases the lattice constants and size of the material.Whenx≤0.8,the curie temperature of Y1-xMgxFeO3 is 100℃than that of YFeO3 and the conductivity of the sensor based on Y1-xMgxFeO3 is higher than that of the sensor based on YFeO3.The reason forit is that Mg2+dopingm forms many holes which can be indicated by the equation:Mg[WTBX]Y*→MgY'+h.The sensitivity to C2H5OH of the sensor based on Y1-xMgxFeO3 is higher than that of sensor based on YFeO3,but the sensitivity to other gases of the sensor based on Y1-xMgxFeO3 is almost equal to that of sensor based on YFeO3 which may be because Mg2+play a catalytic role in the reaction of C2H5OH oxidation.The sensor based on Y0.94Mg0.06FeO3 exhibits highest sensitivity to C2H5OH at 257℃,and S4.5*mol/LC2H5OH/S45*mol/Lpetrol≈4.0.It is a promising gas-sensing material.
Key words:  Mg2+ doping,YFeO3,Gas sensing property,C2H5OHS
FundProject:国家自然科学基金项目(29571026)、安徽省教委自然科学基金资助项目(99J10158)
掺镁YFeO3固溶体的电导和气敏性能研究
葛秀涛,储向锋,刘杏芹
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糩]x糩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4.5*mol/L乙醇的灵敏度高达44;选择性较好,4.5韒ol/LC2H5OH的灵敏度是45*mol/Lpetrol的4.0倍。
关键词:  Mg2+[HTK]掺杂;YFeO3  气敏性能;乙醇
DOI:10.1088/1674-0068/13/3/349-353
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