Dielectric spectroscopy and magnetometry investigation of Gd-doped strontium titanate ceramics

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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.

keywords

THERMOELECTRIC PERFORMANCE; SRTIO3; RELAXATION; SR1-XCAXTIO3; BI-SRTIO3; RELAXOR; IONS

subject category

Materials Science

authors

Tkach, A; Amaral, JS; Vitor, SAB; Vilarinho, PM

our authors

foto João Cunha de Sequeira Amaral

João Cunha de Sequeira Amaral

Auxiliary Researcher
foto Oleksandr Tkach

Oleksandr Tkach

Researcher
foto Paula Maria Lousada Silveirinha Vilarinho

Paula Maria Lousada Silveirinha Vilarinho

Vice Director
foto Vitor Brás Sequeira Amaral

Vitor Brás Sequeira Amaral

Full professor

Groups

2 - Multifunctional Ferroic Ceramics and Nanostructures

Projects

CICECO - Aveiro Institute of Materials (UID/CTM/50011/2013)
Projeto de Investigação Exploratória: João Amaral (IF/01089/2015)
RMNE-UA-National Network of Electron Microscopy (REDE/1509/RME/2005 )

acknowledgements

This work was developed within the scope of the project CICECO-Aveiro Institute of Materials, POCI-01-0145-FEDER007679 (FCT Ref. UID/CTM/50011/2013), financed by national funds through the FCT/MEC and when appropriate co-financed by FEDER under the PT2020 Partnership Agreement as well as within FCT independent researcher grants IF/00602/2013 (AT) and IF/01089/2015 (JSA). SEM/EDS characterization was supported by the project REDE/1509/RME/2005.

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Publication Details

type
Journal Article
year
2017
journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
volume
37
publisher
ELSEVIER SCI LTD
issn
0955-2219
isbn
1873-619X
issue
6
digital object identifier
10.1016/j.jeurceramsoc.2017.02.011
web of science article identifier
WOS:000397359300009

Journal Metrics (JCR 2019)

Journal Impact Factor
4.495
Journal Impact Factor (5 yrs)
4.283
category normalized journal percentile
98.214

Citations

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