| Title |
Reentrant phenomenon in barium titanate zirconate-based relaxor ferroelectrics |
| Authors |
Kröll, Eva ; Mihailova, Boriana ; Haronin, Vadzim ; Banys, Jūras ; Lupascu, Doru C ; Shvartsman, Vladimir V |
| DOI |
10.1002/smll.202501914 |
| Full Text |
|
| Is Part of |
Small.. Weinheim : John Wiley and Sons Inc. 2025, vol. 21, iss. 35, art. no. 2501914, p. [1-11].. ISSN 1613-6810. eISSN 1613-6829 |
| Keywords [eng] |
barium titanate zirconate ; Raman spectroscopy ; Reentrant transition ; relaxor ferroelectric ; solid solution |
| Abstract [eng] |
Reentrant phenomena are rare occurrences in relaxor ferroelectrics, and their underlying mechanisms are still unknown. In this paper, we report on the reentrant relaxor behavior in the perovskite system (1 − x)Ba(Ti0.85Zr0.15)O3-xBi(Zn2/3Nb1/3)O3 with x = 0, 0.015, 0.02, 0.04, 0.06, and 0.15. For all compositions, the temperature dependences of the dielectric permittivity exhibit characteristic reentrant features: a frequency-independent maximum ≈ 340 K (Tm) associated with the ferroelectric phase transition, and a frequency-dependent anomaly (TR) at lower temperatures indicating relaxor behavior. Raman spectroscopy shows that the correlation length of the B-cation displacements is suppressed by doping resulting in a cross-over from macroscopic to mesoscopic polar order. On the other hand, correlated antiferrodistortive rotations of the oxygen octahedra give rise to nanometer size clusters of antipolar shifted A-site cations distributed within the polar matrix. Slowing down of the dynamics of these clusters leads to low-temperature dielectric anomaly and reentrant relaxor behavior. Although competition between polar modes and antiferrodistortive modes is a common feature of perovskite ferroelectrics, it is shown that it can be the origin of the reentrant relaxor behavior. |
| Published |
Weinheim : John Wiley and Sons Inc |
| Type |
Journal article |
| Language |
English |
| Publication date |
2025 |
| CC license |
|
