The surface properties of a Ba-beta-alumina sample (Ba : Al ratio 1 : 12) very stable to sintering (15 m(2)/g after calcination at 1670 K for 10 h) have been investigated by FT-IR spectroscopy of adsorbed probe molecules (water, pyridine and CO2) and by measuring the isoelectric point. The surface has a medium-strong basic character,justified by the preferential exposition of Ba-O-containing ''mirror planes'', parallel to 0001 planes, on the surface of plate-like particles. This behavior has been associated to the resistance to sintering, typical of this material, possibly originated by the difficulty of the very big Ba2+ ions to migrate into the spinel-type alumina blocks. This should imply the blocking of the crystal growth along the crystallographic c axis.

Surface Characterization of Ba-beta-alumina

CRISTIANI, CINZIA;FORZATTI, PIO;GROPPI, GIANPIERO
1995-01-01

Abstract

The surface properties of a Ba-beta-alumina sample (Ba : Al ratio 1 : 12) very stable to sintering (15 m(2)/g after calcination at 1670 K for 10 h) have been investigated by FT-IR spectroscopy of adsorbed probe molecules (water, pyridine and CO2) and by measuring the isoelectric point. The surface has a medium-strong basic character,justified by the preferential exposition of Ba-O-containing ''mirror planes'', parallel to 0001 planes, on the surface of plate-like particles. This behavior has been associated to the resistance to sintering, typical of this material, possibly originated by the difficulty of the very big Ba2+ ions to migrate into the spinel-type alumina blocks. This should imply the blocking of the crystal growth along the crystallographic c axis.
1995
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11311/656030
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