Abstract: Through varying the component proportion of the Pb/Sr and doping 0. 25wt% MnO₂, a series of (Pb_1-xSr_x) TiO₃ infrared sensitive ferroelectric ceramic material was prepared. In this paper, the temperature, frequency, pyroelectric properties of these materials were studied. Results showed that the Curie temperature To would shift lineally with the Pb/Sr ratio. And the increase of 1% mol ratio Pb would raise Curie temperature by about 5℃. With the increase of working frequency, the dielectric constant ε of these materials showed a decrease, but the Curie temperature T_c and the temperature coefficient remained basically the same. The spontaneous polarization intensity of these materials decreased with the rise of the ambient temperature. The pyroelectric coefficient was in the order of 10^-3C/(m²·K).

Key words: temperature properties, pyroelectric property, (Pb_1-xSr_x) TiO₃ ceramic, frequency properties