Enhancement of the dielectric permittivity and magnetic properties of Dy substituted strontium titanate ceramics
authors Tkach, A; Amaral, JS; Zlotnik, S; Amaral, VS; Vilarinho, PM
nationality International
journal JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
author keywords Electroceramics; Donor doping; Polar clusters; Interfacial polarization; Paramagnetism
keywords SRTIO3; RELAXATION; SPECTROSCOPY; BI-SRTIO3; RELAXOR
abstract Structural, dielectric and magnetic properties of dense Dy-substituted strontium titanate ceramics are investigated. In the Sr1-1.5xDyxTiO3 system, incorporation of Dy onto the Sr site is confirmed by a linear decrease of the lattice parameter up to x = 0.05. Dielectric spectroscopy analysis of Sr1-1.5xDyxTiO3 ceramics reveals four relaxations. Two relaxations observed below 55 K are attributed to dipoles formed by off-centre displacement of Dy3+ ions on the Sr sites. Other two dielectric relaxations found at higher temperatures are attributed to the oxygen vacancy related mechanisms. As result, very high dielectric permittivity of similar to 33500 at 28 K and of similar to 9600 around room temperature at moderate dissipation factor of similar to 0.02 are obtained for Sr0 985DY0.01TiO3 ceramics, making it a promising material for capacitor electronic applications. Paramagnetic behaviour observed for Sr1-1.5xDyxTiO3 as well as for Sr1-xDy2xTi1-xO3 ceramics indicates impossibility to induce a magnetic order and hence magnetoelectric coupling in strontium titanate by Dy substitution.
publisher ELSEVIER SCI LTD
issn 0955-2219
year published 2018
volume 38
issue 2
beginning page 605
ending page 611
digital object identifier (doi) 10.1016/j.jeurceramsoc.2017.09.007
web of science category Materials Science, Ceramics
subject category Materials Science
unique article identifier WOS:000418211000027

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