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New lead-free relaxors based on the K0.5Na0.5NbO3–SrTiO3 solid solution

Published online by Cambridge University Press:  03 March 2011

Marija Kosec ,
Vid Bobnar ,
Marko Hrovat ,
Janez Bernard ,
Barbara Malic  and
Janez Holc
Marija Kosec
Affiliation:
Jožef Stefan Institute, Jamova 39, SI-1000 Ljubljana, Slovenia
Vid Bobnar
Affiliation:
Jožef Stefan Institute, Jamova 39, SI-1000 Ljubljana, Slovenia
Marko Hrovat
Affiliation:
Jožef Stefan Institute, Jamova 39, SI-1000 Ljubljana, Slovenia
Janez Bernard
Affiliation:
Jožef Stefan Institute, Jamova 39, SI-1000 Ljubljana, Slovenia
Barbara Malic*
Affiliation:
Jožef Stefan Institute, Jamova 39, SI-1000 Ljubljana, Slovenia
Janez Holc
Affiliation:
Jožef Stefan Institute, Jamova 39, SI-1000 Ljubljana, Slovenia
*
a)Address all correspondence to this author.e-mail: [email protected]
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Abstract

New lead-free relaxors have been produced from the K0.5Na0.5NbO3–SrTiO3 (KNN-STO) system. The solid solubility within the studied range of compositions (1 - x) K0.5Na0.5NbO3–xSrTiO3 was observed for x up to 0.33. A pseudo-cubic perovskite structure was determined for x = 0.15 to 0.25. The high density and the uniform distribution of fine grains and pores were confirmed by the translucency of these ceramics. The 0.85KNN-0.15STO composition reaches the dielectric permittivity of above 3000 at room temperature. Dielectric spectroscopy measurements revealed that, as with lead-based complex perovskites, the cationic distribution disorder is reflected in relaxorlike properties, thus suggesting possible applications based on this environmentally friendly lead-free ceramic system.

Keywords

CeramicX-ray diffraction (XRD)Dielectric properties
Type
Articles
Information
Journal of Materials Research , Volume 19 , Issue 6 , June 2004 , pp. 1849 - 1854
Copyright
Copyright © Materials Research Society 2004

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