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Paper detail

High-temperature structural phase transition in multiferroic LiCu_2O_2

LiCu_2O_2 single crystals were studied in the temperature range 300-1100 K by means of heating-cooling curves of differential thermal analysis (DTA), thermogravimetry (TG), X-ray powder diffraction and electrical measurements. A reversible first-order phase transition between orthorhombic and tetragonal phases was found to take place at 993 K. At the transition, a peak is observed in the DTA curves, as well as jumps of the unit cell parameters and electrical resistivity. Considering the crystal structure of LiCu_2O_2 and the entropy change associated with the phase transition, it is concluded that the phase transition is related to processes of order-disorder of the Cu2+ and Li+ cations onto their crystallographic positions.

preprint2012arXivOpen access
S. A. IvanovA. A. BushK. E. KamentsevE. A. TishchenkoM. OttossonR. MathieuP. Nordblad
cond-mat.mtrl-sci
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S. A. IvanovA. A. BushK. E. KamentsevE. A. TishchenkoM. OttossonR. MathieuP. Nordblad

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