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Precursor and processing effects on BaPbO3 formation kinetics

Published online by Cambridge University Press:  01 March 2006

Jun-ichi Tani ,
Guerman Popov ,
Paul R. Mort  and
Richard E. Riman
Jun-ichi Tani
Affiliation:
Department of Inorganic Chemistry, Osaka Municipal Technical Research Institute, Joto-ku, Osaka 536-8553, Japan
Guerman Popov
Affiliation:
Department of Materials Science and Engineering, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854
Paul R. Mort
Affiliation:
Procter & Gamble Co., Cincinnati, Ohio 45217
Richard E. Riman*
Affiliation:
Department of Materials Science and Engineering, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854
*
a) Address all correspondence to this author. e-mail: riman@rci.rutgers.edu
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Abstract

The synthesis of BaPbO3 from a wide range of mixtures containing metalorganic precursors, nitrate precursors, lead oxides, barium oxide and peroxide was investigated, and the kinetics was analyzed using the Johnson–Mehl–Avrami (JMA) equation. It was found that Ba and Pb stearate soaps and Pb oxalate that were used as metalorganic precursors formed BaCO3 and PbO or Pb3O4 after firing at 440 °C. The formation rate of BaPbO3 from a metalorganic precursor system is not higher than that from the conventional BaCO3–PbO system and does not depend on mixing methods or the kinds of metalorganic precursors but instead on the synthesis atmosphere. In the case of the BaCO3–PbO system, the Avrami exponent (n) is ∼1, indicating that the reaction is controlled by the phase-boundary-contraction interface reaction. For the BaO2–PbO2 system, n has two values ∼1 and ∼0.3, depending on the reaction temperature and time, indicating that the reaction is either controlled by the phase-boundary-contraction interface reaction or diffusion-controlled reaction. In the Ba nitrate–Pb nitrate system, phase-pure BaPbO3 is obtained at 550 °C, which is 250 °C lower than in the case of the BaCO3–PbO system. The value of n for the nitrate system is ∼1.5, indicating that the reaction is controlled by a three-dimensional (3D) diffusion-controlled nucleation mechanism. In the BaO–PbO system, the formation of BaPbO3 started at 350 °C by an exothermic reaction and the content of BaPbO3 in the product was ∼40 wt%, which is independent of reaction temperature as well as time in the temperature range of 350–500 °C.

Keywords

CeramicKineticsSimulation

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Type
Articles
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Journal of Materials Research , Volume 21 , Issue 3 , March 2006 , pp. 584 - 596
Copyright
Copyright © Materials Research Society 2006

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