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采用溶胶-凝胶法制备La0.67Sr0.33Mn O3∶Agx(LSMO∶Agx,x为摩尔百分比,x=0,0.04,0.08,0.10,0.20)多晶材料。通过XRD和R-T对LSMO∶Agx多晶材料的结构和性能进行分析。结果表明:在950、1050℃烧结的样品具有良好的单相结构。1050℃烧结时,Ag进入晶格替换A位La3+或Sr2+,使晶胞发生畸变、晶胞体积增大。Ag掺杂明显降低了样品电阻率,950℃烧结的Ag掺杂样品的电阻率降低了近两个数量级。提高烧结温度有助于改善LSMO材料的Tp和TCR。烧结温度由950℃变化到1050℃时,x=0样品的Tp增加了将近10 K,x=0.04样品的TCR从0.09%K-1上升到0.50%K-1。Ag掺杂能有效改善LSMO材料的电学性能。
La0.67Sr0.33MnO3: Agx (LSMO: Agx, x is mole percent, x = 0,0.04,0.08,0.10,0.20) polycrystalline material was prepared by sol-gel method. The structure and properties of LSMO: Agx polycrystalline materials were analyzed by XRD and R-T. The results show that the samples sintered at 950 and 1050 ℃ have a good single-phase structure. When sintered at 1050 ℃, Ag enters the crystal lattice and replaces La3 + or Sr2 + in A-site, which distorts the unit cell and increases the unit cell volume. Ag doping significantly reduces the sample resistivity, and the resistivity of the Ag doping sample sintered at 950 ℃ decreases by nearly two orders of magnitude. Increasing the sintering temperature helps to improve the Tp and TCR of the LSMO material. When the sintering temperature was changed from 950 ℃ to 1050 ℃, the Tp of x = 0 sample increased nearly 10 K and the TCR of x = 0.04 increased from 0.09% K-1 to 0.50% K-1. Ag doping can effectively improve the electrical properties of LSMO materials.