Semiconductor Physics, Quantum Electronics & Optoelectronics. 2009. V. 12, N 1. P. 031-034.
https://doi.org/10.15407/spqeo12.01.031

Water-sorption effects in nanoporous MgAl2O4 ceramics for humidity sensors
H. Klym1,2, A. Ingram3, O. Shpotyuk1, I. Hadzaman1

1Scientific Research Company "Carat", 202 Stryjska str., 79031 Lviv, Ukraine. Phone 8-0322-638303, email: klymha@yahoo.com, scigroup@novas.com.ua
2Lviv Polytechnic National University, 12, Bandera str., 79013 Lviv, Ukraine
3 Opole University of Technology, 75 Ozimska str., Pl-45370 Opole, POland

Abstract. The water-sorption effects in spinel-structuired MgAl2O4 ceramics are studied using positron annihilation lifetime spectroscopy. It is shown that the most significant changes caused by absorbed water in the ceramics can be revealed in positron trapping rate by assuming constantvalues of reduced bulk and defect-related lifetimes. The observed water-sorption processes occur catalytic effect on positrontrapping rate of extended defects located near intergranual boundaries within ceramics bulk.

Keywords: spinel-structuired ceramics, water-sorption process, intergranual boundaries, positron trapping.

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