Open AccessИсследование диэлектрического отклика, проводимости и тока термостимулированной деполяризации в релаксорном сегнетоэлектрике PbNi-=SUB=-1/3-=/SUB=-Nb-=SUB=-2/3-=/SUB=-O-=SUB=-3-=/SUB=-
Author(s) -
А.Д. Полушина,
Е.Д. Обозова,
В. Г. Залесский,
Т. А. Смирнова,
S. G. Lushnikov
Publication year - 2021
Publication title -
fizika tverdogo tela
Language(s) - English
Resource type - Journals
eISSN - 1726-7498
pISSN - 0367-3294
DOI - 10.21883/ftt.2021.09.51314.088
Subject(s) - conductivity , materials science , dielectric , maxima , activation energy , polarization (electrochemistry) , dielectric response , atmospheric temperature range , condensed matter physics , ferroelectricity , analytical chemistry (journal) , electrical resistivity and conductivity , thermal conductivity , depolarization , nuclear magnetic resonance , chemistry , physics , thermodynamics , optoelectronics , art , chromatography , quantum mechanics , performance art , composite material , art history , medicine , endocrinology
This paper presents results of a study of temperature dependences of dielectric response and DC and AC - conductivity in single crystals of the relaxor ferroelectric PbNi1/3Nb2/3O3 (PNN) in a wide range of frequencies (10 Hz - 100 kHz) and temperatures (80 - 750 K). Anomalies in the dielectric response in the form of broad frequency-dependent maxima in the vicinity of 153 and 730 K are observed. The thermal activation character of DC conductivity has been obtained, and activation energies determined as Ea = 770 meV (T > 310 K) and Ea = 23 meV (T <310 K). The analysis of conductivity gives reason to assume the existence of local conductivity in the low-temperature region. It is shown that the conductivity character changes above 350 K from the local to the bulk one. Measurement by thermally stimulated depolarization has shown the presence of a residual polarization below 130 K.