Phase transitions and twinned low-temperature structures of tetraethylammonium tetrachloridoferrate(III)
Publication date
2014-01-01
Authors
Lutz, M.
Huang, Y. K.
Moret, Marc Etienne
Klein Gebbink, R.J.M.
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Article
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Abstract
The title compound, [(C2H5)4N][FeCl 4], has at room temperature a disordered structure in the high-hexagonal space group P63mc. At 230K, the structure is merohedrally twinned in the low-hexagonal space group P63. The volume has increased by a factor of 9 with respect to the room-temperature structure. At 170 and 110K, the structure is identical in the orthorhombic space group Pca21 and twinned by reticular pseudomerohedry. The volume has doubled with respect to the room-temperature structure. All three space groups, viz. P63mc, P63 and Pca21, are polar and the direction of the polar axis is not affected by the twinning. In the P6 3 and Pca21 structures, all cations and anions are well ordered.
Keywords
crystal structure, group-subgroup relationship, low-temperature structures, phase transitions, tetraethylammonium tetrachloridoferrate(III), twinned structures, Inorganic Chemistry, Physical and Theoretical Chemistry, Materials Chemistry, Condensed Matter Physics
Citation
Lutz, M, Huang, Y, Moret, M E & Klein Gebbink, B 2014, 'Phase transitions and twinned low-temperature structures of tetraethylammonium tetrachloridoferrate(III)', Acta crystallographica. Section C, Structural chemistry, vol. 70, no. 5, pp. 470-476. https://doi.org/10.1107/S2053229614007955