authors |
Tkach, A; Amaral, JS; Vitor, SAB; Vilarinho, PM |
nationality |
International |
journal |
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY |
author keywords |
SrTiO3; Doping; Dielectric relaxation; High-permittivity ceramics; Paramagnetism |
keywords |
THERMOELECTRIC PERFORMANCE; SRTIO3; RELAXATION; SR1-XCAXTIO3; BI-SRTIO3; RELAXOR; IONS |
abstract |
Structural, dielectric and magnetic properties of dense Gd-doped strontium titanate ceramics prepared by the conventional mixed oxide method are studied. Lattice parameter is found to decrease linearly in the Sr1-1.5xGd xTiO3 system, confirming the incorporation of Gd onto the Sr site of the perovskite lattice of strontium titanate up to x=0.05. Real and imaginary parts of the dielectric permittivity of Sr1-1.5xGd xTiO(3) ceramics exhibit a relaxation between 100 Hz and 1 MHz in the temperature range of 17-261k, slightly shifting to higher temperatures with increasing Gd content. Such dielectric behaviour is attributed to the relaxation of individual dipoles formed by off-centre displacement of Gd3+ ions on Sr sites in a highly polarizable lattice of strontium titanate. Other dielectric relaxations observed in Sr(1-1.5)xGd xTiO(3) from 125 to 300K are attributed to the oxygen vacancy related mechanisms. No magnetic anomaly but paramagnetic behaviour is observed for Sr1-1.5xGd xTiO(3) ceramics, indicating an absence of the magnetic order and hence magnetoelectric coupling.(C) 2017 Elsevier Ltd. All rights reserved. |
publisher |
ELSEVIER SCI LTD |
issn |
0955-2219 |
isbn |
1873-619X |
year published |
2017 |
volume |
37 |
issue |
6 |
beginning page |
2391 |
ending page |
2397 |
digital object identifier (doi) |
10.1016/j.jeurceramsoc.2017.02.011 |
web of science category |
Materials Science, Ceramics |
subject category |
Materials Science |
unique article identifier |
WOS:000397359300009
|