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Microstructure and Humidity‐Sensitive Characteristics of α ‐Fe 2 O 3 Ceramic Sensor
Author(s) -
Cantalini Carlo,
Pelino Mario
Publication year - 1992
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1992.tb07840.x
Subject(s) - microstructure , microporous material , sintering , humidity , relative humidity , ceramic , materials science , porosity , adsorption , water vapor , mineralogy , atmospheric temperature range , porosimetry , analytical chemistry (journal) , composite material , chemistry , porous medium , chromatography , physics , organic chemistry , meteorology , thermodynamics
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.