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High-temperature structural phase transition in the LiCu2O2 multiferroic |
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| Authors: | K E Kamentsev A A Bush E A Tishchenko S A Ivanov M Ottoson R Mathieu P Nordblad |
| Institution: | 1. Moscow State Institute of Radio Engineering, Electronics, and Automation (Technical University), pr. Vernadskogo 78, Moscow, 119454, Russia 2. Kapitza Institute for Physical Problems, Russian Academy of Sciences, ul. Kosygina 2, Moscow, 119334, Russia 3. Karpov Research Institute of Physical Chemistry, ul. Vorontsovo pole 10, Moscow, 105064, Russia 4. Department of Engineering Sciences, Uppsala University, Box 534, SE-75121, Uppsala, Sweden 5. Department of Chemistry, Uppsala University, Box 538, SE-75121, Uppsala, Sweden |
| Abstract: | The results of thermogravimetric, X-ray diffraction, and electrical studies of LiCu2O2 single crystals in the temperature range 300–1100 K are presented. A reversible first-order phase transition between the orthorhombic and tetragonal phases is found to occur in these single crystals at T = 993 K. A pronounced peak on a differential thermal analysis curve and jumps in the unit cell parameters and the electrical resistivity are detected at the phase-transition temperature. The data on the crystal structure of LiCu2O2 and the phase transition-induced change in the entropy determined in this work are used to conclude that the revealed phase transition is caused by the ordering-disordering of Li+ and Cu2+ cations in their structural positions. |
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