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近二十年来,钙钛矿型复合氧化物由于其特殊的电、磁性质在固体物理和固体化学领域受到人们的重视,也是催化领域中被广泛研究的体系之一,尤其是在开发敏感材料方面进行了大量的应用性研究.由于它们大多数呈半导体特性,其中有些化合物随着可燃性(或还原性)气体的吸脱附其电导率可逆地发生变化,而且热稳定性好,灵敏度较高,因此用稀土钙钛矿型复合氧化物作为气敏材料有着广阔的应用前景.实验所用样品为SmMn_(1-y)Fe_yO_3体系中组成分别为Y=0.0,0.2,0.5,0,8.1.0的系列氧化物,采用硝酸盐热分解法制得,并经X射线衍射法分析证明呈单一的钙钛矿物相.
For nearly two decades, perovskite-type composite oxides have attracted people’s attention in solid state and solid state chemistry due to their special electric and magnetic properties. They are also widely studied in the field of catalysis, especially in the development of sensitive materials Since most of them are semiconducting, some of these compounds reversibly change their electrical conductivity with the adsorption and desorption of flammable (or reducing) gases, and their thermal stability and sensitivity are better than those of Therefore, the rare earth perovskite-type composite oxide as a gas-sensitive material has broad application prospects.The samples used in the experiment are Y = 0.0,0.2,0.5,0,8.1 in the system of SmMn 1-y Fe_yO 3. 0 series of oxides, prepared by the nitrate thermal decomposition method, and X-ray diffraction analysis showed a single perovskite phase.