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Issue 17, 2015
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Structural transition in KMnCrF6 – a chemically ordered magnetic ferroelectric

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Abstract

The structure of the tetragonal tungsten bronze fluoride KMnCrF6 was investigated via high-resolution synchrotron powder diffraction at variable temperatures (T = 5–950 K). A structural transition is observed at T = 400 K from a high-temperature centrosymmetric phase (P42/mbc) to an orthorhombic non-centrosymmetric phase (Ccc2). The phase transition is driven by the cooperative tilt of the MF6 octahedra and displacements of Mn2+ and Cr3+ along the polar c-axis. The polar structure and the low temperature ferrimagnetic behaviour (TN = 23 K) make KMnCrF6 a potential multiferroic material. The room temperature orthorhombic structure is robust upon application of high pressures up to 18 GPa with a bulk modulus K = 49.2(7) GPa.

Graphical abstract: Structural transition in KMnCrF6 – a chemically ordered magnetic ferroelectric

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Supplementary files

Article information


Submitted
11 Sep 2014
Accepted
17 Feb 2015
First published
18 Feb 2015

J. Mater. Chem. C, 2015,3, 4321-4332
Article type
Paper
Author version available

Structural transition in KMnCrF6 – a chemically ordered magnetic ferroelectric

C. Drathen, T. Nakagawa, W. A. Crichton, A. H. Hill, Y. Ohishi and S. Margadonna, J. Mater. Chem. C, 2015, 3, 4321
DOI: 10.1039/C4TC02038C

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