Abstract
Changes in the state of coordination and electron distribution in a fine paniculate solid mixture under mechanical stressing are studied by solid state nuclear magnetic resonance (NMR) and electron paramagnetic resonance (EPR), coupled with more conventional analytical tools, e.g., X-ray photoelectron spectroscopy or infrared spectroscopy. Systems examined are mainly Ca(OH)2 + SiO2 and metallic Al + hydrogel, TiO2H2O. Si-O-Ca or Al-O-Ti bridging bonds are formed either by charge transfer, i.e. an acid-base reaction in a broad definition, or by radical recombination. The charge transfer is also elucidated on the basis of electronegativity equalization, by taking low-coordination states into account.
Original language | English |
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Pages (from-to) | 387-392 |
Number of pages | 6 |
Journal | Solid State Ionics |
Volume | 101-103 |
Issue number | PART 1 |
Publication status | Published - 1997 Nov |
Keywords
- Charge transfer
- Complex oxides
- EPR
- Mechanochemical reaction
- Solid state nmr
ASJC Scopus subject areas
- Chemistry(all)
- Materials Science(all)
- Condensed Matter Physics