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An unprecedented structural phase transition in struvite-type compounds: dimorphism of KMgAsO4(H2O)6

  • Matthias Weil EMAIL logo
Published/Copyright: August 27, 2018
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Abstract

The crystal structure of struvite-type KMgAsO4(H2O)6 has been redetermined from single crystal X-ray diffraction data at room temperature. The previous structure model based on powder X-ray diffraction data was confirmed with higher precision and accuracy and with all hydrogen atoms located. KMgAsO4(H2O)6 undergoes a reversible phase transition of the continuous type at 263(2) K, changing the symmetry from orthorhombic to monoclinic. The corresponding Pnm21P1121 symmetry reduction is of a translationengleiche type with index 2 and was monitored by temperature-dependent powder X-ray diffraction measurements. Such a phase transition is unprecedented for struvite-type compounds. The crystal structure of the monoclinic polymorph was determined from a two-domain crystal at 100 K. Except for the motion of one of the water molecules towards stronger hydrogen-bonding interactions, structural changes between the two polymorphs are small.


Dedicated to: Professor Wolfgang Bensch on the occasion of his 65th birthday.


Acknowledgment

The X-ray Centre of TU Wien is acknowledged for providing access to the X-ray diffractometers.

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Received: 2018-06-11
Accepted: 2018-08-09
Published Online: 2018-08-27
Published in Print: 2019-01-26

©2019 Walter de Gruyter GmbH, Berlin/Boston

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