DIELECTRIC BEHAVIOUR OF A NANOGRAIN PMN POWDERS

JURAS BANYS Laboratory of Phase Transitions Dielectric Spectroscopy, Faculty of Physics, Vilnius University, 9 Sauletekio str., 10222, Vilnius, Lithuania

ROBERTAS GRIGALAITIS Laboratory of Phase Transitions Dielectric Spectroscopy, Faculty of Physics, Vilnius University, 9 Sauletekio str., 10222, Vilnius, Lithuania

MAKSIM IVANOV Laboratory of Phase Transitions Dielectric Spectroscopy, Faculty of Physics, Vilnius University, 9 Sauletekio str., 10222, Vilnius, Lithuania

JULIE CARREAUD Laboratorie Structures, Propriétés et Modelisation des Solides, Ecole Centrale Paris, Grande Voie des Vignes, 92295, Chatenay-Malabry, Cedex, France

J. M. KIAT Laboratorie Structures, Propriétés et Modelisation des Solides, Ecole Centrale Paris, Grande Voie des Vignes, 92295, Chatenay-Malabry, Cedex, France; Laboratoire Léon Brillouin, CE Saclay, 91191, Gif-sur-Yvette, Cedex, France

ABSTRACT

Dielectric permittivity of 150 nm mean grain size Pb(Mn_1/3Nb_2/3)O₃ (PMN) nanopowder has been investigated by dielectric spectroscopy in the 20 Hz–1 MHz frequency range and 100 K–400 K temperature range. The broad and diffused dielectric dispersion has been observed, but the dispersion region and the maximum of the real part of dielectric permittivity is shifted to lower temperatures compare to PMN single crystal and ceramics. The mean relaxation time, obtained from fits of the frequency dependences of the dielectric permittivity with Cole-Cole formula, changes according to the Vogel-Fulcher law with the freezing temperature T ₀ = 88 K which is much lower than in bulk PMN materials.

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