Microstructure and Humidity‐Sensitive Characteristics of α ‐Fe 2 O 3 Ceramic Sensor

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Abstract
The microstructure and humidity‐sensitive characteristics of α ‐Fe 2 O 3 porous ceramic were investigated. Microporous α ‐Fe 2 O 3 powders were obtained by controlling the topotactic decomposition reaction of α ‐FeOOH. Water vapor adsorption thermogravimetrical experiments were carried out in the relative humidity (rh) range 0% to 95% on the α ‐Fe 2 O 3 powder and the 900°C sintered compact. The microstructure was investigated by SEM, TEM, Hg intrusion, and N 2 adsorption porosimetry techniques. The humidity sensitivity was investigated by the impedance measurements technique in 0% to 95% rh on the compacts sintered at 50°C steps in the 850° to 1100°C range. Humidity response was found to be affected by the microstructure, i.e., the characteristics of the precursor powders and sintering temperatures.

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