Characteristic Features of the Modulated Phases in (MgGeF6)·6H2O Crystals |
| Yu. Pankivskyia, S. Svelebab and R. Hrabanskic
aDepartment of Ecology, Ukrainian University of Forestry, O. Kobylyanskoyi st. 1, Lviv, 79005, Ukraine bDepartment of Nonlinear Optics, Lviv National Ivan Franko University, Tarnavskogo st. 107, Lviv, 79000, Ukraine cInstitute of Physics, Technical University of Czestochowa, al. Armii Krajowej 19, 42-200 Częstochowa, Poland |
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| Received: 4 03 2004; revised version 16 06 2004; |
| The temperature dependences of the optical birefringenceδ(Δnc) in (MgGeF6)·6H2O crystal have been investigated. Specific properties observed in experiment such as global hysteresis, kinetic effect, thermooptic memory effect, localization of the incommensurability wave vector on the commensurate values of higher order, sensibility to the external mechanical stress confirm the existence of the incommensurate phase in current crystals. |
| DOI: 10.12693/APhysPolA.106.467 PACS numbers: 64.70.-p |