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Suppressed Reactivity of AlN Powder in Water at 5°C
Author(s) -
Kocjan Andraž,
Dakskobler Aleš,
Budič Bojan,
Kosmač Tomaž
Publication year - 2013
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.12237
Subject(s) - hydrolysis , aqueous solution , suspension (topology) , passivation , amorphous solid , aqueous suspension , hydroxide , chemistry , chemical engineering , inorganic chemistry , materials science , nuclear chemistry , layer (electronics) , crystallography , organic chemistry , mathematics , homotopy , pure mathematics , engineering
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 AlCl 3 solution.