Ultrafine spinel powders by flame spray pyrolysis of a magnesium aluminum double alkoxide

Ultrafine crystalline spinel powder has been prepared using flame spray pyrolysis of alcoholic solutions of a novel double alkoxide precursor. The particles produced are spherical, dense, single crystals with diameters of 10--100 nm and specific surface areas ranging from 40 to 60 m{sup 2}/g. Powder production rates of 50--100 g/h are achieved using a bench-top apparatus. Particle formation appears to occur by rapid oxidation of the organic ligands followed by nucleation and growth from oxide species.

[1]  R. Bunshah,et al.  Ultrafine aluminium nitride powder produced by plasma-assisted chemical vapour deposition of trimethylaluminium , 1992, Journal of Materials Science.

[2]  R. Flagan,et al.  Synthesis of Yttria Powders by Electrospray Pyrolysis , 1994 .

[3]  Gary L. Messing,et al.  Ceramic Powder Synthesis by Spray Pyrolysis , 1993 .

[4]  H. Gleiter,et al.  Materials with ultrafine microstructures: Retrospectives and perspectives , 1992 .

[5]  R. Averback,et al.  High temperature mechanical properties of nanostructured ceramics , 1992 .

[6]  M. Mayo,et al.  Processing nanocrystalline ceramics for applications in superplasticity , 1993 .

[7]  A. A. Adjaottor,et al.  Aerosol Synthesis of Aluminum Nitride Powder Using Metalorganic Reactants , 1992 .

[8]  Chang Li,et al.  Structural inhomogeneity and crystallization behavior of aerosol-reacted MgAl2O4 powders , 1992 .

[9]  J. Bocquet,et al.  Submicronic MgAl2O4 powder synthesis in supercritical ethanol , 1992 .

[10]  B. Hockey,et al.  Fabrication of Transparent γ‐Al2O3 from Nanosize Particles , 1994 .

[11]  S. Pratsinis,et al.  Strategies for control of ceramic powder synthesis by gas-to-particle conversion , 1995 .

[12]  J. Mackenzie,et al.  Formation of dense and non-agglomerated lead oxide particles by spray pyrolysis , 1992 .

[13]  L. Qi,et al.  Hydrothermal Preparation of Uniform Nanosize Rutile and Anatase Particles , 1995 .

[14]  G. Skandan,et al.  Nanostructured Y2O3: Synthesis and relation to microstructure and properties , 1991 .

[15]  R. Birringer,et al.  Nanocrystalline materials an approach to a novel solid structure with gas-like disorder? , 1984 .

[16]  R. Flagan,et al.  Evaluation and control of particle properties in aerosol reactors , 1988 .

[17]  J. Cesarano,et al.  Synthesis of Submicrometer Mullite Powder via High-Temperature Aerosol Decomposition , 1992 .

[18]  R. Averback,et al.  Low‐Temperature Creep of Nanocrystalline Titanium(IV) Oxide , 1991 .