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

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

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 densi...

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Veröffentlicht in:Journal of materials research 2004-06, Vol.19 (6), p.1849-1854
Hauptverfasser: Kosec, Marija, Bobnar, Vid, Hrovat, Marko, Bernard, Janez, Malic, Barbara, Holc, Janez
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Ceramic
Dielectric properties
X-ray diffraction (XRD)
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container_end_page 1854
container_issue 6
container_start_page 1849
container_title Journal of materials research
container_volume 19
creator Kosec, Marija
Bobnar, Vid
Hrovat, Marko
Bernard, Janez
Malic, Barbara
Holc, Janez
description 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.
doi_str_mv 10.1557/JMR.2004.0229
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Dielectric properties
X-ray diffraction (XRD)
title New lead-free relaxors based on the K0.5Na0.5NbO3–SrTiO3 solid solution
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