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Effect of electric fields on solid-state reactions between oxides

Part 4 Interdiffusion in polycrystalline calcium oxide and silicon dioxide pellets

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Abstract

Interdiffusion in sintered polycrystalline pellets of CaO and SiO2 occurs predominantly by migration of Ca into SiO2 and is influenced by the application of d.c, electric fields which increase the penetration distance when the silica is negatively charged, and markedly decrease the diffusion when the polarity is reversed. Pseudowollastonite (α-CaSiO3) is formed in the interfacial region of the silica pellets under all conditions, withβ-Ca2SiO4 also appearing in the SiO2 (−ve) electrolysed samples, possibly as a result of stabilization by the excess Ca present which also occurs as CaO interpenetrating the silica pellet. Diffusion coefficients estimated for both the unelectrolysed and field-assisted (SiO2−ve) samples are similar to those for Ca diffusion inα-CaSiO3, but samples electrolysed under reverse polarity conditions (SiO2 + ve) have a much larger diffusion activation energy. The effective electrical mobilities of Ca in the CaO-SiO2 system derived from these results are discussed.

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Authors and Affiliations

  1. Chemistry Division, DSIR, Private Bag, Petone, New Zealand

    I. W. M. Brown & K. J. D. Mackenzie

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  1. I. W. M. Brown
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  2. K. J. D. Mackenzie
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Brown, I.W.M., Mackenzie, K.J.D. Effect of electric fields on solid-state reactions between oxides. J Mater Sci 17, 3663–3671 (1982). https://doi.org/10.1007/BF00752212

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  • DOI: https://doi.org/10.1007/BF00752212

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