Temperature impedance spectroscopy of (1-x)Na1/2Bi1/2TiO3-xLaMg(1/2)Ti(1/2)O(3) solid solutions
authors Olekhnovich, NM; Moroz, II; Pushkarev, AV; Radyush, YV; Salak, AN; Vyshatko, NP; Ferreira, VM
nationality International
journal PHYSICS OF THE SOLID STATE
keywords DIELECTRIC-PROPERTIES; MODULUS SPECTROSCOPY; CERAMICS; NA0.5BI0.5TIO3; RELAXATION; LEAD; PEROVSKITES; BEHAVIOR
abstract The dielectric properties of (1-x)Na1/2Bi1/2TiO3-xLaMg(1/2)T(1/2)O(3) solid solutions (0 <= x <= 0.4) were studied over the temperature range 650-1030 K by measuring the impedance spectra over the frequency range 25-10(6) Hz. The Curie temperature T-C was determined as a function of the composition of the solid solutions. It is shown that T-C decreases linearly with increasing x. The temperature dependences of the dc component (sigma(dc)) and the polarization component (sigma(')(ac)) of the real part of the conductivity are found. The activation energy for the conductivity sigma(dc) is shown to increase abruptly as the temperature increases above approximately 770 K for all solid solution compositions. Over the temperature range corresponding approximately to the region of existence of the tetragonal phase of Na1/2Bi1/2TiO3, the polarization component sigma(')(ac) of the solid solutions, as well as that of the pure compound, is anomalously high at low frequencies, which can be due to structural inhomogeneities.
publisher MAIK NAUKA/INTERPERIODICA/SPRINGER
issn 1063-7834
year published 2008
volume 50
issue 3
beginning page 490
ending page 495
digital object identifier (doi) 10.1134/S1063783408030165
web of science category Physics, Condensed Matter
subject category Physics
unique article identifier WOS:000254141900016
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