Sintering and exploitation properties of humidity-sensitive nanostructured ceramics and thick films based on MgAl₂O₄ spinel

Abstract

The electrophysical properties of nanostructured MgAl₂O₄ ceramics sintered at 1300 °C for 5 h, as well as thick films were obtained and investigated. The study of adsorption-desorption cycles was carried out after sintering and aging test. It is shown that ceramic has a sensitivity to humidity in the range of 25–95% with minimal hysteresis of the characteristic in adsorption-desorption cycles, which can be eliminated after the aging test. Thick films based on it are characterized by hysteresis and loss of sensitivity at low values of relative humidity, which is caused by the clogging of small nanopores.

Keywords:

• Adsorption
• degradation
• desorption
• humidity
• nanostructured ceramics
• sensors
• thick films

Acknowledgments

The authors thank to the Ministry of Education and Science of Ukraine for the support. H.K. thanks Prof. O. Shpotyuk for the discussion of results.

Disclosure statement

No potential conflict of interest was reported by the author(s).