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Crystallization kinetics of Si-TCP bioceramic films

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Abstract

The crystallization kinetics leading to the formation of a characteristic globular, interconnected morphology in the transformation of an unfired hydroxyapatite precipitate (HA) to silicon stabilized tri-calcium phosphate (Si-TCP) are examined by rapid thermal processing of thin films prepared on silica substrates. The results are interpreted using an Avrami model in which nucleation of Si-TCP is induced by diffusion of a silicon front from the substrate. The model is supported through SEM inspection of the morphological development. The transformation is characterized as an interfacial reaction with Avrami exponent m = 1.3 ± 0.2, activation energy for the reaction E c = 2.5 ± 0.3 eV and time constant τc = 20 ± 1 s at 950°C. Silicon in the films acts to nucleate Si-TCP, while also causing impurity pinning of grains, resulting in a fine microstructure when excess Si is present in the film.

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Authors and Affiliations

  1. Department of Physics, Queen's University, Kingston, ON, K7L 3N6, Canada

    A. Pietak, M. Sayer & M. J. Stott

Authors
  1. A. Pietak
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  2. M. Sayer
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  3. M. J. Stott
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Correspondence to A. Pietak.

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Pietak, A., Sayer, M. & Stott, M.J. Crystallization kinetics of Si-TCP bioceramic films. Journal of Materials Science 39, 2443–2449 (2004). https://doi.org/10.1023/B:JMSC.0000020008.76515.bd

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  • DOI: https://doi.org/10.1023/B:JMSC.0000020008.76515.bd

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