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Crystal structure, thermal behaviour and parageneses of koninckite, FePO4·2.75H2O

Published online by Cambridge University Press:  02 January 2018

J. Plášil ,
J. Majzlan ,
M. Wierzbicka-Wieczorek  and
B. Kiefer
J. Plášil*
Affiliation:
Institute of Physics ASCR, v.v.i., Na Slovance 2, Prague 8, 182 21, Czech Republic
J. Majzlan
Affiliation:
Institute of Geosciences, Burgweg 11, University of Jena, D-07749, Germany
M. Wierzbicka-Wieczorek
Affiliation:
Institute of Geosciences, Burgweg 11, University of Jena, D-07749, Germany
B. Kiefer
Affiliation:
Department of Physics, 1255 N Horseshoe, New Mexico State University, Las Cruces, New Mexico, 88003, USA
*
*E-mail: plasil@fzu.cz
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Abstract

The crystal structure of the mineral koninckite was solved from synchrotron powder X-ray diffraction (XRD) data and refined using density-functional theory (DFT) calculations. Koninckite is tetragonal, with the space group P41212, a = 11.9800(5) Å, c = 14.618(1) Å, V = 2097.9(2) Å3, Z = 8. Its structure is a heteropolyhedral framework with zeolite-like tunnels along [001]. Owing to the severe peak overlap in the powder XRD data and the probable intergrowth of enantiomorphic domains in koninckite, the DFT calculations were applied to provide precise atomic positions (including hydrogen). Additionally, the DFT calculations suggest strongly that koninckite is an antiferromagnetic semiconductor, at least at low temperatures. The DFT computations were used to locate H2O molecules in the channels and to complete the structural description. Thermogravimetric analysis and powder XRD data at variable temperatures show that the structure of koninckite dehydrates and eventually collapses between 160–180°C. Negative thermal expansion was observed between 80 and 150°C. A list of the known occurrences of koninckite suggests that this mineral is not as rare as assumed previously; koninckite is often fine-grained, inconspicuous, and thereby easy to overlook. Koninckite is yet another natural example of an Fe-phosphate zeolitic material.

Keywords

koninckiteferric phosphatesynchrotron diffractioncrystal structuredensity-functional theory
Type
Research Article
Information
Mineralogical Magazine , Volume 79 , Issue 5 , October 2015 , pp. 1159 - 1173
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2015

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