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Clays and Clay Minerals; June 2003; v. 51; no. 3; p. 350-353; DOI: 10.1346/CCMN.2003.0510312
© 2003 Clay Minerals Society
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A PECULIAR MORPHOLOGY OF GIBBSITE AND NORDSTRANDITE CO-CRYSTALLIZED IN THE PRESENCE OF TARTRATE IN A STRONGLY ALKALINE ENVIRONMENT

P. Adamo*, M. Pigna, S. Vingiani and A. Violante

Dipartimento di Scienze del Suolo, della Pianta e dell’Ambiente, Universitá di Napoli Federico II, Via Universitá, 100, 80055 Portici, Italy

* E-mail address of corresponding author: adamo{at}unina.it

The nature and morphology of Al(OH)3 polymorphs obtained by precipitating Al and tartrate at pH 12.0 and at a tartrate/Al molar ratio (R) of 0.1 were studied by X-ray diffraction, transmission electron microscopy and electron diffraction. Co-crystallization of unusually long (up to 18 µm) ‘stick-shaped’ gibbsite with platy particles of both nordstrandite, mainly, and bayerite was observed. Face-to-face associations of plates nucleated perpendicularly on the gibbsite surfaces parallel to the c axis produced peculiar elongated ‘brush’-shaped particles. In a strongly alkaline environment the inhibiting effect of tartrate on Al(OH)3 polymorph formation is reduced and production of co-crystallized phases with structural crystallographic similarities can be observed.

Key Words: Al(OH)3 Polymorphs • Alkaline pH • Electron Diffraction • Morphology • Tartaric Acid • TEM






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