Abstract
Pellets of MgFe2O4 were prepared by sintering, at different temperatures, powders prepared either by solid-state reaction between MgO and Fe2O3, or by the thermal decomposition of hydroxide mixtures, co-precipitated from magnesium and iron nitrate solutions with an Mg/Fe ratio of 1:2. Mercury porosimetry, specific surface area measurements and scanning electron microscopy were used in order to determine the main microstructural characteristics of the pellets. Electrochemical impedance spectroscopy (EIS) was used to correlate the humidity-sensitive electrical response of the pellets with their microstructure, in particular with total open porosity and pore-size distribution. EIS measurements showed a close correlation between their relative humidity dependence of the electrical resistance and the microstructure of the sintered bodies. Rather good reproducibility and a fast response time to humidity variations, evaluated from d.c. measurements, were also observed. These properties are also strictly dependent on the microstructure.
Similar content being viewed by others
References
B. M. Kulwicki, J. Am. Ceram. Soc. 74 (1991) 697.
H. Arai and T. Seiyama, in “Sensors: A Comprehensive Survey, Chemical and Biochemical Sensors, Part II”, Vol. 3, edited by W. Göpel, J. Hesse and J. N. Zemel (VCH Verlag, Weinheim, 1992) p. 981.
T. Nitta, Z. Terada and S. Hayakawa, J. Am. Ceram. Soc. 63 (1980) 295.
T. Seiyama, N. Yamazoe and H. Arai, Sens. Actuators 4 (1983) 85.
T. Suzuki and N. Matsui, in “Analytical Chemistry Symposia Series: Chemical Sensors”, Vol. 17, edited by T. Seiyama, K. Fueki, J. Shiokawa and S. Suzuki (Kodansha, Tokyo, and Elsevier, Amsterdam, 1983) p. 381.
G. Gusmano, G. Montesperelli, P. Nunziante and E. Traversa, in “Ceramic Transactions: Ceramic Powder Science IV”, Vol. 22, edited by S. I. Hirano, G. L. Messing and H. Hausner (American Ceramic Society, Westerville, Ohio, 1991) p. 545.
Y. Shimizu, H. Arai and T. Seiyama, Sens. Actuators 7 (1985) 11.
K. Katayama, K. Hasegawa, T. Takahashi, T. Akiba and H. Yanagida, ibid.— A24 (1990) 55.
H. T. Sun, M. T. Wu, P. Li and X. Yao, ibid.— 19 (1989) 61.
G. Gusmano, P. Nunziante, E. Traversa and R. Montanari, Mater. Chem. Phys. 26 (1990) 513.
Y. C. Yeh, T. Y. Tseng and D. A. Chang, J. Am. Ceram. Soc. 73 (1990) 1992.
H. Jankowska, H. Swiatkoski and J. Choma, “Active Carbon” (Ellis Horwood, Chichester, 1991) p. 121.
G. Gusmano, G. Montesperelli, P. Nunziante and E. Traversa, Br. Ceram. Trans. 92 (1993) 104.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Gusmano, G., Montesperelli, G., Nunziante, P. et al. Humidity-sensitive electrical response of sintered MgFe2O4 . JOURNAL OF MATERIALS SCIENCE 28, 6195–6198 (1993). https://doi.org/10.1007/BF00365043
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/BF00365043