Titre du document / Document title

CaCO₃ (Calcite)/Li₂CO₃ (Zabuyelite) Anomalous Mixed Crystals. Sector Zoning and Growth Mechanisms

Auteur(s) / Author(s)

PASTERO Linda ⁽¹⁾ ; AQUILANO Dino ⁽¹⁾ ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

⁽¹⁾ Dipartimento di Scienze Mineralogiche e Petrologiche, Università degli Studi di Torino, Via Valperga Caluso 35, 10125 Torino, ITALIE

Résumé / Abstract

A growth model of {0001} form bearing calcite crystals has been proposed in our previous papers. A detailed PBC (periodic bond chains) study demonstrated that calcite {0001} form could not be stable, owing to its K character. The stabilization involves a 2D epitaxial growth mechanism between calcium and lithium carbonate, the model being supported by parametric fit between calcium and lithium carbonates. In this paper, we experimentally evaluate the consistency of this model. Integrated spectroscopic and imaging characterization techniques, inductively coupled plasma optical emission spectroscopy (ICP-OES), scanning electron microscopy (SEM), atomic force microscopy (AFM), X-ray powder diffraction (XRPD), cathodoluminescence (CL) and electron paramagnetic resonance (EPR) have been applied to synthetic calcite crystals grown in the presence of lithium in order to investigate whether and how lithium can be absorbed into the calcite lattice. Experiments and theoretical considerations prove that lithium enters the calcite crystals during their growth, according to strongly differentiated sector absorption mediated by 2D and 1D epitaxy on the corresponding {0001} and {1014} crystal forms.

Revue / Journal Title

Crystal growth & design   ISSN 1528-7483 

Source / Source

2008, vol. 8, n^o9, pp. 3451-3460 [10 page(s) (article)] (29 ref.)

Langue / Language

Anglais

Editeur / Publisher

American Chemical Society, Washington,DC, ETATS-UNIS  (2001) (Revue)

Mots-clés anglais / English Keywords

Crystal growth from solutions ; Crystal form ; Crystal growth ; Electron paramagnetic resonance ; Calcium carbonate ; Cathodoluminescence ; Powder pattern ; XRD ; Atomic force microscopy ; Scanning electron microscopy ; Optical emission spectra ; Inductively coupled plasma ; Imaging ; Lithium carbonates ; Epitaxial layers ; Epitaxy ; Theoretical study ; Growth mechanism ; Calcite ;

Mots-clés français / French Keywords

8110A ; 8110D ; Li ; Li2CO3 ; CaCO3 ; Croissance cristalline en solution ; Forme cristalline ; Croissance cristalline ; Résonance paramagnétique éléctronique ; Carbonate de calcium ; Cathodoluminescence ; Diagramme poudre ; Diffraction RX ; Microscopie force atomique ; Microscopie électronique balayage ; Spectre émission optique ; Plasma couplé inductivement ; Formation image ; Lithium carbonate ; Couche épitaxique ; Epitaxie ; Etude théorique ; Mécanisme croissance ; Calcite ;

Mots-clés espagnols / Spanish Keywords

Forma cristalina ; Calcio carbonato ; Diagrama polvo ; Espectro emisión óptica ; Mecanismo crecimiento ;

Localisation / Location

INIST-CNRS, Cote INIST : 27261, 35400018522152.0490