Anomalous Non-linear Dielectric Behaviour of LATGS Crystals |
| R. Cacha, J. Mrózb and D. Hadena aInstitute of Experimental Physics, University of Wrocław, Cybulskiego 36, 50-205 Wrocław, Poland bInstitute of Physics, Technical University of Wrocław, Wybrzeże S. Wyspiańskiego 27, 50-317 Wrocław, Poland |
| Received: February 19, 1991 |
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| The dielectric permittivity in a biasing electric field and also the spontaneous polarization of LATGS crystals are measured near the ferroelectric phase transition. It is demonstrated that L-alanine admixtures change the parameters of dielectric state equation. It is shown that the bias field value decreases while approaching the phase transition temperature from the para-electric phase. The effective non-linearity coefficient B, near Tc, depends on electric field direction. This anomalous non-linear behaviour can be explained assuming asymmetric bias field dependence on external electric field. |
| DOI: 10.12693/APhysPolA.79.905 PACS numbers: 77.80.Bh, 77.20.+y |