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Substitution of aluminium by gallium in β-alumina
In the two-block structure of β-alumina the effects of the replacement of aluminium by gallium have been investigated. As alkali ions sodium and potassium have been chosen. The alkali to trivalent metal ratio varied between 1:6 and 1:7. In this composition range for the sodium derivative substitutio...
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Published in: | The Journal of physics and chemistry of solids 1974-01, Vol.35 (9), p.1225-1229 |
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Main Author: | |
Format: | Article |
Language: | English |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | In the two-block structure of β-alumina the effects of the replacement of aluminium by gallium have been investigated. As alkali ions sodium and potassium have been chosen. The alkali to trivalent metal ratio varied between 1:6 and 1:7. In this composition range for the sodium derivative substitution could be accomplished up to an aluminium to gallium ratio of about 1:9 without the presence of a second phase. For potassium the two-block β-alumina phase does exist for the aluminate and for the gallate systems. A complete range of solid solutions appears to exist for these two compounds.
From sintered, polycrystalline pellets (with a density between 85 and 90 per cent of the theoretical density), X-ray powder diffraction diagrams have been recorded. The unit cell parameters increase linearly with the gallium content in accordance with the larger radius of the trivalent gallium ion. The expansion of the lattice parameters did not change the electrical conductivity of the sodium β-alumina samples. However, for the analogous potassium specimens a decrease of the electrical conductivity has been observed with increasing gallium content. |
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ISSN: | 0022-3697 1879-2553 |
DOI: | 10.1016/S0022-3697(74)80145-9 |