Two-phase dielectric polar structures in 0.1NBT-0.6ST-0.3PT solid solutions

0492458 - FZÚ 2019 RIV GB eng J - Journal Article
Svirskas, Š. - Shvartsman, V.V. - Dunce, M. - Ignatans, R. - Birks, E. - Ostapchuk, Tetyana - Kamba, Stanislav - Lupascu, D.C. - Banys, J.
Two-phase dielectric polar structures in 0.1NBT-0.6ST-0.3PT solid solutions.
Acta Materialia. Roč. 153, Jul (2018), s. 117-125. ISSN 1359-6454. E-ISSN 1873-2453
R&D Projects: GA MŠMT(CZ) LD15014
Institutional support: RVO:68378271
Keywords : ferroelectrics * phase transition * PFM * dielectric spectroscopy
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 7.293, year: 2018

In this work we address the peculiarities of the macroscopic responses in ternary 0.1Na0.5Bi0.5TiO(3)0.6SrTiO(3)-0.3PbTiO(3) (0.1NBT-0.6ST-0.3PT) solid solutions. These solid solutions exhibit a spontaneous first order relaxor to normal ferroelectric phase transition. The phase transition is accompanied by a broad dielectric relaxation which expands over 10 orders of magnitude in frequency just above the phase transition temperature. The temperature dependence of polarization shows that non-zero net polarization persists above the phase transition temperature. Below the phase transition temperature, it is not possible to describe the temperature dependence of polarization with a power law function which is valid in normal ferroelectrics. The piezoresponse force microscopy studies reveal that 0.1NBT-0.6ST-0.3PT solids solutions display several local polarization patterns which arise due to the bimodal distribution of grains in the ceramics.
Permanent Link: http://hdl.handle.net/11104/0285990