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Suppressed Reactivity of AlN Powder in Water at 5°C

Authors

  • Andraž Kocjan,

    Corresponding author
    1. Berzelii Center EXSELENT on Porous Materials, Stockholm University, Stockholm, Sweden
    • Department of Materials and Environmental Chemistry, Stockholm University, Stockholm, Sweden
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  • Aleš Dakskobler,

    1. Engineering Ceramics Department, Jožef Stefan Institute, Ljubljana, Slovenia
    2. Center of Excellence Namaste, Ljubljana, Slovenia
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  • Bojan Budič,

    1. Laboratory for Analytical Chemistry, National Institute of Chemistry, Ljubljana, Slovenia
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  • Tomaž Kosmač

    1. Engineering Ceramics Department, Jožef Stefan Institute, Ljubljana, Slovenia
    2. Center of Excellence Namaste, Ljubljana, Slovenia
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Author to whom correspondence should be addressed. e-mail: a.kocjan@ijs.si

Abstract

The hydrolysis behavior of AlN powder suspensions (5–25 wt%) at 5°C has been investigated to explore the impact of low temperatures on the hydrolysis behavior. Throughout the 312-h long experiment, the pH value of the suspensions was below 9, where the hydrolysis remained in the induction period and was eventually suppressed due to the formation of a few-nanometers-thick film of amorphous aluminum hydroxide gel around the AlN particles, acting as a passivation layer. Moreover, the aqueous part of the suspension possessed a remarkably high value of dissolved [Al(III)]aq, being an order of magnitude higher at a given pH value than the aqueous AlCl3 solution.

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