Vol. 97, Issue 10, October 2008, pp.74-79

Abstract: The perovskite oxides, Dy_1-xSr_xCrO₃ (0£x£0.1) were synthesized by a novel microwave assisted combustion route and characterized by X-ray diffraction. X-ray pattern of Dy_0.9Sr_0.1CrO₃ showed the presence of small amounts of SrCrO₄ impurity. The perovskite oxides were tested as candidate materials for humidity sensing by measuring the variation in their DC resistance as a function of relative humidity in the range of 5-98 % at 25^oC under static conditions. The sensitivity factor, S_f (R_5%/R_98%) for DyCrO₃, Dy_0.95Sr_0.05CrO₃ and Dy_0.90Sr_0.10CrO₃ were calculated to be 218, 3609 and 6364 respectively. The response and recovery characteristics were studied for Dy_0.90Sr_0.10CrO₃, which exhibited good linearity in log R vs. RH plots and narrow hysteresis loop in adsorption-desorption investigations.

Keywords: DyCrO₃, SrCrO₃, Electrical properties, Humidity sensor

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