Solid state interactions in nano-sized oxides
| Autor: | Yu. Kotov, A. Neiman, O. M. Samatov, E. Tsipis, A. Murzakaiev, I. V. Beketov |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
Materials science
Nickel oxide Inorganic chemistry Non-blocking I/O Oxide chemistry.chemical_element General Chemistry Conductivity Condensed Matter Physics Bismuth Metal chemistry.chemical_compound chemistry Chemical engineering visual_art Differential thermal analysis visual_art.visual_art_medium General Materials Science Ceramic |
| Zdroj: | Solid State Ionics. 177:403-410 |
| ISSN: | 0167-2738 |
| DOI: | 10.1016/j.ssi.2005.10.028 |
| Popis: | Comparative study of reactivity of nano- and micro-sized alumina and nickel oxide, obtained by the electrical explosion of metal wires in oxidizing atmosphere, was carried out for the reactions NiO + MoO 3 , NiO + Al 2 O 3 , and Al 2 O 3 + Bi 2 O 3 by coupled anneals of ceramics, measurements of the conductivity of individual oxides and raw oxide mixtures, X-ray diffraction and differential thermal analysis. The total conductivity of nano-structured oxides was found lower than that of micro-structured ceramics. Mixing bismuth oxide with nano-structured alumina leads to stabilization of the low temperature polymorph α-Bi 2 O 3 up to 780 °C. The diffusion permeability of NiMoO 4 layer grown at the surface of NiO ceramics, having submicron grains, was found 2 times lower if compared to NiMoO 4 grown at micro-sized NiO ceramics. NiO and Al 2 O 3 nano-powders preserve the high reactivity even when heated up to 1000 °C. The results are discussed in terms of size effects on the solid state reactivity of oxides. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect