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A Peculiar Morphology of Gibbsite and Nordstrandite Co-Crystallized in the Presence of Tartrate in a Strongly Alkaline Environment

Published online by Cambridge University Press:  01 January 2024

P. Adamo ,
M. Pigna ,
S. Vingiani  and
A. Violante
P. Adamo*
Affiliation:
Dipartimento di Scienze del Suolo, della Pianta e dell'Ambiente, Università di Napoli Federico II, Via Università, 100, 80055 Portici, Italy
M. Pigna
Affiliation:
Dipartimento di Scienze del Suolo, della Pianta e dell'Ambiente, Università di Napoli Federico II, Via Università, 100, 80055 Portici, Italy
S. Vingiani
Affiliation:
Dipartimento di Scienze del Suolo, della Pianta e dell'Ambiente, Università di Napoli Federico II, Via Università, 100, 80055 Portici, Italy
A. Violante
Affiliation:
Dipartimento di Scienze del Suolo, della Pianta e dell'Ambiente, Università di Napoli Federico II, Via Università, 100, 80055 Portici, Italy
*
*E-mail address of corresponding author: adamo@unina.it
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Abstract

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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.

Keywords

Al(OH)3 PolymorphsAlkaline pHElectron DiffractionMorphologyTartaric AcidTEM
Type
Research Article
Information
Clays and Clay Minerals , Volume 51 , Issue 3 , June 2003 , pp. 350 - 353
Copyright
Copyright © 2003, The Clay Minerals Society

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