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On two new K2FeF5 forms

Published online by Cambridge University Press:  03 January 2014

Armel Le Bail
Armel Le Bail*
Affiliation:
Laboratoire des Oxydes et Fluorures, CNRS UMR 6010, Université du Maine, avenue O. Messiaen, 72085 Le Mans Cedex 9, France
*
a) Author to whom correspondence should be addressed. Electronic mail: Armel.Le_Bail@univ-lemans.fr
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Abstract

Two additional forms of K2FeF5 are disclosed and characterized by powder diffraction. One (form-IV) adopts a new A2MF5 structural type, space group C2/m, a = 13.0919(2) Å, b = 5.7311(1) Å, c = 7.3114(1) Å, β = 118.241(1), and Z = 4, it is obtained from the thermal evolution of form-III, isostructural with Rb2FeF5, space group Pnma, a = 7.3964(2)  Å, b = 5.6779(1) Å, c = 11.5445(3) Å, and Z = 4. Both forms are compared to two previously reported polymorphs. The III → IV transition is topotactic, conserving the same zigzag cis-connected octahedral (FeF5)n 2n− chains after an ~90° rotation and 1/2b translation of half of them.

Keywords

potassium iron fluoridepowder diffractioncrystal structurepolymorphism

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Type
Technical Articles
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Powder Diffraction , Volume 29 , Issue 1 , March 2014 , pp. 33 - 41
Copyright
Copyright © International Centre for Diffraction Data 2014 

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