Dynamic behavior of polar nanodomains in PbMg_1/3Nb_2/3O₃

Abstract

Temporal relaxation of the electric field-induced polarization in single crystalline PbMg,,,Nb,,,O, has been measured at temperatures 180 < T< 230 K and times up to lo4 s via polarization-optically induced linear birefringence, An'''. The data are excellently described within the framework of Chamberlin's dynamically correlated domain theory. Whereas activated Curie-von Schweidler-type cluster-flip behavior prevails in the paraelectric regime, T > 210 K, Kohlrausch-Williams-Watts-type domain wall relaxation characterizes the ferroelectric nanodomain state at low temperatures.

Spontaneous and induced surface piezoresponse in PbMg1/3Nb2/3O3single crystals

“…We have found that the time dependence of the induced piezoresponse follows the power law. This is in a good agreement with results of birefringence studies of the polarization relaxation in PMN single crystals [28]. In that case also the CvS type of the relaxation was found at temperatures above T f .…”

Revisit of the Vögel–Fulcher freezing in lead magnesium niobate relaxors

“…12 For dielectric measurement, disk samples with a thickness about 1 mm and a diameter about 10 mm were used. [1][2][3][4] For Љ, its temperature at maximum T m Ј also shifts to higher values with increasing frequencies. The dielectric properties were measured as a function of temperature between 600 and 110 K ͑at a cooling rate of 0.8 K/min͒ using an LCR meter ͑Hewlett Packard 4274A͒ over a frequency range of 100 Hz to 100 kHz.…”

“…[1][2][3][4] Infinite ͑or very large͒ relaxation time usually means a glasslike "freezing" of the spectrum. 1,2 Lead magnesium niobate PbMg 1/3 Nb 2/3 O 3 ͑PMN͒ can be regarded as an archetypal RFE.…”

Distribution of relaxation times of relaxors: comparison with dipolar glasses

“…On the other hand, two or more Cole-Cole functions describe dielectric dispersion better in relaxors, however a further drawback of such an approach is the inherent difficulty of separating processes with comparable relaxation times. Other predefined distribution functions: Davidson-Cole [12], Havriliak-Negami [13, Joncher, Kolraush-WiliamsWatts and Curie-von Schweidler [14] also frequently are used for analysis of dielectric data of relaxors, however such analysis can not explain dynamics of polar nanoregions.…”