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The effect of zirconia content on the structure of zirconia-silica xerogels as determined by x-ray and neutron diffraction and ZrK-edge EXAFS and XANES
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UNSPECIFIED (2000) The effect of zirconia content on the structure of zirconia-silica xerogels as determined by x-ray and neutron diffraction and ZrK-edge EXAFS and XANES. JOURNAL OF PHYSICS-CONDENSED MATTER, 12 (15). pp. 3505-3519.
Research output not available from this repository, contact author.Abstract
We present combined x-ray and neutron diffraction, and extended x-ray absorption fine structure (EXAFS) and x-ray absorption near edge structure (XANES) results on a single set of (ZrO2)(x)(SiO2)(1-x) xerogel samples. In these samples, there is improved homogeneity of Zr compared to our previous study, due to greater dilution of the precursor Zr n-propoxide in propan-1-ol. Structural parameters obtained from model fitting of the diffraction and EXAFS data are compared with those in reference compounds. A qualitative comparison df XANES spectra is also made. The results show that for x greater than or equal to 0.3 there is phase separation of ZrO2 and the Zr environment is similar to that in monoclinic ZrO2 and Zr hydroxide. For x less than or equal to 0.2 there is no phase separation, the SiO2 network is distorted and the Zr coordination is similar to that in Zr n-propoxide, with some Zr-Zr clustering.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Subjects: | Q Science > QC Physics | ||||
| Journal or Publication Title: | JOURNAL OF PHYSICS-CONDENSED MATTER | ||||
| Publisher: | IOP PUBLISHING LTD | ||||
| ISSN: | 0953-8984 | ||||
| Official Date: | 17 April 2000 | ||||
| Dates: |
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| Volume: | 12 | ||||
| Number: | 15 | ||||
| Number of Pages: | 15 | ||||
| Page Range: | pp. 3505-3519 | ||||
| Publication Status: | Published |
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