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Effect of Supported Na+Ions on the Texture Properties of ZrO2

✍ Scribed by Zheng Liu; Weijie Ji; Lin Dong; Yi Chen

Publisher
Elsevier Science
Year
1998
Tongue
English
Weight
280 KB
Volume
138
Category
Article
ISSN
0022-4596

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✦ Synopsis

The dispersion of sodium nitrate on tetragonal zirconia and the effect of the dispersed sodium species on the textural properties of the support are investigated by using XRD, LRS, DTA, and BET surface area measurement. The results indicate that NaNO3 can be dispersed on the surface of tetragonal zirconia by the incorporation of Na Ψ‰ ions into the surface vacant sites. The experimentally measured dispersion capacity of sodium nitrate on t-ZrO2 is consistent with the value deduced from the incorporation model, i.e., 8.6 Na Ψ‰ /nm 2 t-ZrO2. The dispersed Na Ψ‰ ion species can effectively hinder the sintering of zirconia and prevent its phase transformation from tetragonal to monoclinic. The crystallization temperature and surface area of the samples are strongly dependent on the loaded amount of NaNO3 when it is below the dispersion capacity. Crystalline NaNO3 is detected when its loading exceeds the dispersion capacity and has less effect on the structural and textural properties of the t-ZrO2.

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