Abstract
In this study, high-density La1-xSrxMnO3:Ag0.2 (x = 0.1, 0.125, 0.15, 0.175, and 0.2) ceramics were prepared by the conventional sol-gel method. The peak values of temperature coefficient of resistivity (TCR) in all La1-xSrxMnO3:Ag0.2 samples were systematically controlled by changing the Sr content. A significant improvement in peak TCR have been observed through adjusting the Sr content. At doping molar ratio of x = 0.15 in La1-xSrxMnO3:Ag0.2 ceramics, the peak TCR value reached 14.7% K−1, and peak TCR temperature (TK, 288.2 K) was estimated to room-temperature (290 K). Visibly, it is encouraging to get such a high room-temperature TCR value. These findings suggested that La0.85Sr0.15MnO3:Ag0.2 ceramics could be used to prepare room-temperature uncooled infrared bolometers.
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