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Possibilities and Limitations in the Growth of Mixed Metal Oxide Particles from Aqueous Media

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Fine Particles Science and Technology

Part of the book series: NATO ASI Series ((ASHT,volume 12))

Abstract

Synthesis of precursors for mixed metal oxides can be achieved by coprecipitation from aqueous media. This procedure offers clear advantages over traditional solid state reactions. There are however important limitations:

  1. (i)

    The nucleation and growth kinetics usually lead to inhomogeneous indepth profiles of the concentration of the metal ions.

  2. (ii)

    The mixing of a sparingly soluble metal oxide with a readily soluble one requires either the coprecipitation of basic salts (carbonates or oxalates), or the alteration of the solubility behavior. Changes in solubility can be achieved by using oxidative or reductive precipitation or by using complexants, including hydroxide ions.

  3. (iii)

    Mixed oxides in contact with water may be corroded selectively, through the leaching of the more soluble component.

Examples of the above problems shall be given; the chosen systems are mixed Cu-Zn oxides, YBa2Cu3O7-x and barium hexaferrite.

Mixed copper–zinc oxides: Precursors were synthesized by homogeneous alkalinization with urea. The nature of the solids depends on the ratio Cu:Zn; only when this ratio is larger than 10:1 the precursors evolve smoothly to Zn-substituted tenorite. Good spherical monodisperse solids can be prepared. Other detected phases are aurichalcite and Zn-substituted malachites.

YBa 2 Cu 3 O 7-x : In contact with water, barium and yttrium are selectively leached, whereas copper oxide is reprecipitated. The kinetics of the evolution depend on the composition of the aqueous medium.

BaO.6Fe 2 O 3 : Precursors for this oxide can be prepared from strongly alkaline ferrate(VI) solutions, by reductive coprecipitation of Fe2O3 + Ba(OH)2.

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Authors and Affiliations

  1. Comisión Nacional de Energía Atómica, Avenida del Libertador 8250, 1429, Buenos Aires, Republica Argentina

    Miguel A. Blesa, Galo J. de A.A. Soler-Illia, Roberto J. Candal & Alberto E. Regazzoni

  2. INQUIMAE, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellón II, Ciudad Universitaria, 1428, Buenos Aires, Republica Argentina

    Miguel A. Blesa, Galo J. de A.A. Soler-Illia, Roberto J. Candal & Alberto E. Regazzoni

Authors
  1. Miguel A. Blesa
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  2. Galo J. de A.A. Soler-Illia
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  3. Roberto J. Candal
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  4. Alberto E. Regazzoni
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Editor information

Editors and Affiliations

  1. Dipartimento di Chimica Analitica, Università di Torino, Torino, Italy

    Ezio Pelizzetti

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© 1996 Kluwer Academic Publishers

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Blesa, M.A., de A.A. Soler-Illia, G.J., Candal, R.J., Regazzoni, A.E. (1996). Possibilities and Limitations in the Growth of Mixed Metal Oxide Particles from Aqueous Media. In: Pelizzetti, E. (eds) Fine Particles Science and Technology. NATO ASI Series, vol 12. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-0259-6_3

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  • DOI: https://doi.org/10.1007/978-94-009-0259-6_3

  • Publisher Name: Springer, Dordrecht

  • Print ISBN: 978-0-7923-4047-8

  • Online ISBN: 978-94-009-0259-6

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