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The Canadian Mineralogist; February 2008; v. 46; no. 1; p. 183-193; DOI: 10.3749/canmin.46.1.183
© 2008 Mineralogical Association of Canada
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GAUDEFROYITE, Ca8Mn3+6[(BO3)6(CO3)2O6]: HIGH-TEMPERATURE CRYSTAL STRUCTURE

Sytle M. Antao1,§ and Ishmael Hassan2

1 Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA
2 Department of Chemistry, University of the West Indies, Mona, Kingston 7, Jamaica

§ E-mail address: sytle.antao{at}anl.gov

Nous avons déterminé le comportement structural de la gaudefroyite, Ca8Mn3+6[(BO3)6(CO3)2O6], au moyen d’affinements Rietveld de données en diffraction X sur poudre obtenues entre 25 et 486°C avec rayonnement synchrotron. La structure a aussi été affinée à 25°C en utilisant des données de haute résolution obtenues avec rayonnement synchrotron; les paramètres réticulaires de la maille pseudo-hexagonale sont a 10.60791(2), c 5.88603(1) Å, et V 573.605(2) Å3 à température ambiante. L’expansion de la structure est presque isotrope, et résulte surtout de l’augmentation de la distance Ca1–O3. Le changement du volume en allant de 25° à 486°C est 2.2(2)%. Au delà de 486°C, nous observons des changements importants dans le spectre de diffraction X; ils indiquent la formation d’une faible quantité d’une seconde phase, exsolvée de la gaudefroyite hôte.

(Traduit par la Rédaction)

Mots-clés: gaudefroyite, structure à température élevée, exsolution, affinements de Rietveld, rayonnement synchrotron.




This article has been cited by other articles:


Home page
 Can MineralHome page
S. M. Antao and I. Hassan
INCREASE IN Al-Si AND Na-Ca DISORDER WITH TEMPERATURE IN SCAPOLITE Me32.9
Can Mineral, December 1, 2008; 46(6): 1577 - 1591.
[Abstract] [Full Text] [PDF]

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