Original paper

Effect of crystallinity on diaspore and boehmite relative stability

Gout, Robert; Verdes, Giles

European Journal of Mineralogy Volume 5 Number 2 (1993), p. 215 - 218

13 references

published: Apr 27, 1993
manuscript accepted: Dec 2, 1992
manuscript received: Mar 29, 1991

DOI: 10.1127/ejm/5/2/0215

BibTeX file

ArtNo. ESP147050502003, Price: 29.00 €

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Abstract

Abstract Solubility measurements of boehmite and diaspore carried out in alkaline solutions demonstrate that diaspore is the stable phase at temperatures lower than 380°C. However, it is impossible to synthesize purely aluminous diaspore in the laboratory at low temperatures and pressures. Synthesis of ferriferous diaspore at low temperature exhibits the initial precipitation of a poorly crystallized variety of diaspore which subsequently transforms into well crystallized diaspore. The solubility of poorly crystallized diaspore (purely aluminous) is equal to or slightly greater than that of boehmite. Thus, at low temperature and pressure, diaspore can form only when foreign ions (like iron) substitute in place of aluminium in its lattice to stabilize it

Keywords

solubilitythermodynamic propertiesaluminium oxyhydroxideboehmitediasporemetastability