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Structure of (Ta2O5)(x)(SiO2)(1-x) xerogels (x=0.05, 0.11, 0.18, 0.25 and 1.0) from FTIR, Si-29 and O-17 MAS NMR and EXAFS
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UNSPECIFIED (2000) Structure of (Ta2O5)(x)(SiO2)(1-x) xerogels (x=0.05, 0.11, 0.18, 0.25 and 1.0) from FTIR, Si-29 and O-17 MAS NMR and EXAFS. JOURNAL OF MATERIALS CHEMISTRY, 10 (8). pp. 1887-1894. ISSN 0959-9428.
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Abstract
A combination of Si-29 and O-17 MAS NMR, EXAFS and FT-IR spectroscopy has been used to study the atomic structure of (Ta2O5)(x)(SiO2)(1 - x) (x = 0.05, 0.11, 0.18 and 0.25) xerogels prepared by reacting partially-hydrolysed tetraethyl orthosilicate with tantalum(V) ethoxide. Amorphous tantala, a-Ta2O5, xerogels have also been prepared and their structures studied in detail for the first time. Results have shown that in all these materials, Ta adopts predominantly 5-fold coordination with respect to oxygen. For the mixed oxide xerogels, partial phase separation of the two component oxides occurs for x > 0.11.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QD Chemistry T Technology > TA Engineering (General). Civil engineering (General) |
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Journal or Publication Title: | JOURNAL OF MATERIALS CHEMISTRY | ||||
Publisher: | ROYAL SOC CHEMISTRY | ||||
ISSN: | 0959-9428 | ||||
Official Date: | 2000 | ||||
Dates: |
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Volume: | 10 | ||||
Number: | 8 | ||||
Number of Pages: | 8 | ||||
Page Range: | pp. 1887-1894 | ||||
Publication Status: | Published |
Data sourced from Thomson Reuters' Web of Knowledge
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