【摘要】 采用湿化学法制备了粒度在０．２～０．８μｍ范围的钙钛矿型Ｌａ（１－ｘ）Ｓｒ＿ｘＭｎＯ＿３粉末，用室温和高温Ｘ衍射法测定其晶体结构。发现其在１２００℃高温发生了四方→立方的相变；制备的粉末粒度与水浴温度有一定的关系，在室温时电阻率在６．０×１０￣（－３）～６．９×１０￣（－３）Ω·ｃｍ范围内，在温度大于４５０℃后，随着温度的升高，电阻率亦升高。更多还原

【Abstract】 Perovskite-type（La（1-x）Sr_xMnO3）powders in the range of grain size of 0.2～1.8μm havebeen prepared by the coprecipitation process and the crystalline structure and electrical prop-erties of the powders have been investigated. At certain bathing temperatures and pH val-ues,ultra-fine ceramic powders can be obtained. The least square method is used to calculatethe lattice constants; The structure of La_1-xSr_xMnO₃ remains unchanged with an increase ofthe Sr content,but the lattice constant a（h）decreases although c（h）remains constant. It hasbeen found that La_1-xSr_xMnO₃（x=0.1,0. 2）undergoes a tetragonal-cubic phase trasition at1 200 ℃, The average resistivity of La_0.5Sr_0.5MnO₃ is 6. 4×10￣（-3）Ω·cm at room temperatureand it increases with the temperature when the temperature exceeds 450℃. Experimental re-sults show that the material will be good for making SOFC electrodes,更多还原