La1-xSrxMnO3:Ag-0.2 (0.1 = x = 0.2) ceramics with large room-temperature TCR for uncooled infrared bolometers

摘要

In this study, high-density La1-xSrxMnO3:Ag-0.2 (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:Ag-0.2 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:Ag-0.2 ceramics, the peak TCR value reached 14.7% K-1, and peak TCR temperature (T-k, 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:Ag-0.2 ceramics could be used to prepare room-temperature uncooled infrared bolometers.