High-temperature structural phase transition in multiferroic LiCu2O2
Abstract
LiCu2O2 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 LiCu2O2 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.
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