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Journal of Materials Engineering and Performance

Erschienen in:

08.02.2016

Nanostructural Free-Volume Effects in Humidity-Sensitive MgO-Al₂O₃ Ceramics for Sensor Applications

verfasst von: H. Klym, A. Ingram, O. Shpotyuk, I. Hadzaman, O. Hotra, Yu. Kostiv

Erschienen in: Journal of Materials Engineering and Performance | Ausgabe 3/2016

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Abstract

Technologically modified spinel MgO-Al₂O₃ ceramics were prepared from Al₂O₃ and 4MgCO₃·Mg(OH)₂·5H₂O powders at sintering temperatures of 1200, 1300, and 1400 °C. Free-volume structural effects in MgO-Al₂O₃ ceramics and their electrophysical properties were studied using combined x-ray diffraction, scanning electron microscopy, Hg-porosimetry, and positron annihilation lifetime spectroscopy. It is shown that increasing of sintering temperature from 1200 to 1400 °C results in the transformation of pore size distribution in ceramics from tri- to bi-modal including open macro- and meso(micro)pores with sizes from ten to hundreds nm and nanopores with sizes up to a few nm. Microstructure of these ceramics is improved with the increase of sintering temperature, which results in decreased amount of additional phases located near grain boundaries. These phase extractions serve as specific trapping centers for positrons penetrating the ceramics. The positron trapping and ortho-positronium decaying components are considered in the mathematical treatment of the measured spectra. Classic Tao-Eldrup model is used to draw the correlation between the ortho-positronium lifetime and the size of nanopores, which is complementary to porosimetry data. The studied ceramics with optimal nanoporous structure are highly sensitive to humidity changes in the region of 31-96% with minimal hysteresis in adsorption-desorption cycles.

Vorheriger Artikel Influence of Tension-Compression Asymmetry on the Mechanical Behavior of AZ31B Magnesium Alloy Sheets in Bending

Nächster Artikel The Effect of TaC Reinforcement on the Oxidation Resistance of CNTs/SiC CMCs

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Titel: Nanostructural Free-Volume Effects in Humidity-Sensitive MgO-Al2O3 Ceramics for Sensor Applications
verfasst von: H. Klym
A. Ingram
O. Shpotyuk
I. Hadzaman
O. Hotra
Yu. Kostiv
Publikationsdatum: 08.02.2016
Verlag: Springer US
Erschienen in: Journal of Materials Engineering and Performance / Ausgabe 3/2016
Print ISSN: 1059-9495
Elektronische ISSN: 1544-1024
DOI: https://doi.org/10.1007/s11665-016-1931-9

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