High-temperature structural phase transition in multiferroic LiCu_2O_2
| Autor: | Ivanov, S. A., Bush, A. A., Kamentsev, K. E., Tishchenko, E. A., Ottosson, M., Mathieu, R., Nordblad, P. |
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| Rok vydání: | 2012 |
| Předmět: | |
| Zdroj: | J. Exp. Theor. Phys. 117, 320 (2013) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1134/S1063776113100026 |
| Popis: | 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. Comment: 15 pages, 6 figures |
| Databáze: | arXiv |
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