Free Access
Issue
J. Chim. Phys.
Volume 95, Number 7, July/August 1998
Page(s) 1731 - 1747
DOI https://doi.org/10.1051/jcp:1998337
DOI: 10.1051/jcp:1998337


J. Chim. Phys. Vol. 95, N°7  p. 1731-1747

Le système ternaire H 2O-NH 4NO 3-Al(NO 3) 3. II. Le diagramme polythermique jusquà 100 °C

M. Kaddami1, S. El Allali1, M. Ferhat2 and J.-J. Counioux3

1  Laboratoire de Physico-Chimie des Matériaux, École Nationale de l'Industrie Minérale, BP. 753, Agdal Rabat, Maroc
2  Laboratoire de Chimie Physique, Faculté des Sciences de Rabat, Maroc
3  Laboratoire de Physico-Chimie Minérale II, URA 116 du CNRS, Université Claude Bernard Lyon I, 43 boulevard du 11 novembre 1918, 69622 Villeurbanne, France

Abstract
The ternary system H 2O-NH 4NO 3-Al(NO 3) 3. II. The polythermic diagram up to 100 °C. The solid-solid equilibrium diagram of H 2O-NH 4NO 3-Al(NO 3) 3.6H 2O composition field is completely established up to 100 °C. A quasi-binary eutectic and ten ternary isobar invatiant transformations are observed by thermal analysis and fully characterized:


\begin{displaymath}\bullet \; \mathrm{liq.}\ E \leftrightarrow ice\ +\ NH_4NO_3\,V\ +\ Al(NO_3)_3.9H_2O
\; \; at~--33.6~\circ C\end{displaymath}


\begin{displaymath}\bullet \; \mathrm{liq.}\ T_1\ +\ NH_4NO_3\,IV \leftrightarrow ice\ +\ NH_4NO_3\,V
\; \; at~--18.8~\circ C\end{displaymath}


\begin{displaymath}\bullet \; \mathrm{liq.}\ Q_1\ +\ Al(NO_3)_3.8H_2O\alpha \lef...
...arrow Al(NO_3)_3.9H_2O\ +\
NH_4NO_3\,IV\; \; at~--12.3~\circ C\end{displaymath}


\begin{displaymath}\bullet \; \mathrm{liq.}\ T_2\ +\ NH_4NO_3\,IV \leftrightarrow
Al(NO_3)_3.9H_2O\ +\ NH_4NO_3\; \; at~--18.8~\circ C\end{displaymath}


\begin{displaymath}\bullet \; \mathrm{liq.}\ T_3\ +\ NH_4NO_3\,IV \leftrightarrow
NH_4NO_3\,V \ (binary)\; \; at~32~\circ C\end{displaymath}


\begin{displaymath}\bullet \; \mathrm{liq.}\ T_4\ +\ NH_4NO_3\,III \leftrightarrow
Al(NO_3)_3.8H_2O?\ +\ NH_4NO_3\,IV\; \; at~32~\circ C\end{displaymath}


\begin{displaymath}\bullet \; \mathrm{liq.}\ T_5\ +\ Al(NO_3)_3.8H_2O\beta \left...
...(NO_3)_3.8H_2O\alpha\ +\ Al(NO_3)_3.9H_2O \; \; at~37.0~\circ C\end{displaymath}


\begin{displaymath}\bullet \; \mathrm{liq.}\ T_6\ +\ Al(NO_3)_3.8H_2O\beta \left...
...
Al(NO_3)_3.8H_2O\alpha\ +\ NH_4NO_3\,III\; \; at~37.0~\circ C\end{displaymath}


\begin{displaymath}\bullet \; \mathrm{liq.}\ Q_2\ +\ Al(NO_3)_3.6H_2O \leftright...
... Al(NO_3)_3.8H_2O\beta\ + \ NH_4NO_3\,III \; \; at~41.0~\circ C\end{displaymath}


\begin{displaymath}\bullet \; \mathrm{liq.}\ T_7\ +\ Al(NO_3)_3.8H_2O\gamma \lef...
...l(NO_3)_3.8H_2O\beta\ + \ Al(NO_3)_3.9H_2O\; \; at~51.0~\circ C\end{displaymath}


\begin{displaymath}\bullet \; \mathrm{liq.}\ T_8\ + \ Al(NO_3)_3.8H_2O\gamma \le...
...)_3.6H_2O\beta\ + \ Al(NO_3)_3.8H_2O\beta \; \; at~51.0~\circ C\end{displaymath}

Résumé
Le diagramme des équilibres solide-liquide en fonction de la température est établi dans le domaine de composition correspondant au sous-système H 2O-NH 4NO 3-Al(NO 3) 3.6H 2O. Neuf nappes de cristallisation sont délimitées. Elles sont relatives aux liquidus de la glace, NH 4NO 3III, IV et V, Al(NO 3) 3.6H 2O, Al(NO 3) 3.8H 2O $\alpha$, $\beta$ et $\gamma$ et Al(NO 3) 3.9H 2O. Dix transformations invariantes ternaires isobares sont mises en évidence et caractérisées.


Key words: système ternaire -- transformations invariantes -- H 2O-NH 4NO 3-Al(NO 3) 3
Contents

© EDP Sciences 1998

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