Proceedings of the XIX All-Russian Conference on Physics of Ferroelectrics (VKS-XIX) (Moscow, Russia, June 19-23, 2011

Low- and infralow-frequency dielectric properties of the Pb(Mg$_{1/3}$Nb$_{2/3}$)O$_3$ +2 wt.% Li$_2$O ceramics

A. I. Burkhanov^a, I. E. Tumanov^a, K. Bormanis^b, A. Kalvane<sup>b

a</sup> Volgograd State University of Architecture and Civil Engineering
^b Institute of Solid State Physics, Latvian University, Riga, LV-1063, Latvia

Abstract: A dielectric response of the Pb(Mg$_{1/3}$Nb$_{2/3}$)O$_3$ ferroelectric ceramics with impurity of 2 wt% Li has been studied. The phase transition has been found to exhibit a relaxor character, as is the case in PMN without Li. However, unlike pure PMN, the dielectric response dispersion in PMN + 2 wt% Li$_2$O has been described by the Cole–Cole equation at temperatures below the temperature of the low-frequency maximum of the permittivity. An analysis of the dispersion parameters in a wide temperature range has demonstrated that it can be due to the relaxation of domain walls in PMN + 2 wt% Li$_2$O that appear most likely because of the existence of anomalously coarse grains in PMN + 2 wt% Li$_2$O.

 English version: Physics of the Solid State, 2012, 54:5, 992–993

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