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| Titel: |
Aerosol Spray Pyrolysis Synthesis of Magnetic Manganese Ferrite Particles |
| Auteur: |
Li, Qiang Sorensen, C. M. Klabunde, K. J. Hadjipanayis, G. C. |
| Verschenen in: |
Aerosol science and technology |
| Paginering: | Jaargang 19 (1993) nr. 4 pagina's 453-467 |
| Jaar: |
1993 |
| Inhoud: |
We describe the aerosol spray pyrolysis synthesis and subsequent properties of manganese ferrite (MnFe2O4) submicrometer particles. Various combinations of the chlorides and nitrates of manganese and iron dissolved in water were used as precursors. Typical aerosol reactor residence times were 0.5-1.5s. With insufficient reactor temperature, e.g., 650°C, porous, hollow particles with a mixture of the ferrite and the individual metal oxides were obtained. These intermediate phases and morphologies were precursor dependent. In particular, nitrate ion caused oxidization of the manganese to the trivalent state, which is unsuitable for ferrite formation and caused what we termed a chemical segregation of the phases. Postaerosol baking showed how these particles evolved to dense, single-phase, agglomerated ferrite particles. If instead the aerosol reactor was at a sufficiently high temperature, > 900°C, dense, single-phase, unagglomerated particles were formed in one aerosol step. The particles had nearly bulklike magnetic properties except for effects that could be ascribed to the submicrometer size of the particles and the rapid thermal quenching as the particles left the reactor. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
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