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

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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.

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Authors and Affiliations

  1. Jozef Stefan Institute, Jamova 39, SI-1000, Ljubljana, Slovenia

    Marija Kosec, Vid Bobnar, Marko Hrovat, Janez Bernard, Barbara Malic & Janez Holc

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  1. Marija Kosec
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  2. Vid Bobnar
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  3. Marko Hrovat
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  4. Janez Bernard
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  5. Barbara Malic
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  6. Janez Holc
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Correspondence to Barbara Malic.

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Kosec, M., Bobnar, V., Hrovat, M. et al. New lead-free relaxors based on the K0.5Na0.5NbO3–SrTiO3 solid solution. Journal of Materials Research 19, 1849–1854 (2004). https://doi.org/10.1557/JMR.2004.0229

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