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Electrochemical Behaviour of Lamellar Interfaces in CoO - ZrO2(CaO) Aligned Eutectic Structures Submitted to Chemical Reduction

  • B. Bonvalot-Dubois (a1), G. Dhalenne (a1) and A. Revcolevschi (a1)

Abstract

In a previous study we have examined the reduction of nickel oxide into nickel in NiO-ZrO2(CaO) aligned lamellar eutectic structures [1-2]. From the data which were obtained, we developed a model accounting for the fast reduction of nickel oxide; in particular it was shown that reduction takes place through the action of an electrochemical local cell, involving fast transport of oxygen to the sample surface through the cubic zirconia phase [2].

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1) Revcolevschi, R. and Dhalenne, G., Nature, 316, 1985, 335.
2. Bonvalot-Dubois, B., Dhalenne, G., Berthon, J., Revcolevschi, A. and Rapp, R.A., J. Am. Ceran. Soc., 71, 1988, 296.
3. Revcolevschi, A., Rev. lnt. Hautes Temp. Réfract., 7, 1970, 73.
4. Dhalenne, G. and Revcolevschi, A., J. Crystal Growth, 69, 1984, 616.
5. Revcolevschi, A., Dhalenne, G. and d'Yvoire, F., J. Phys. Colloq., 46, 1985, C4441.
6. Bonvalot-Dubois, B., Ph.D, thesis, 1988, Orsay.

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