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Glass-ceramics of barium strontium titanate for high energy density capacitors

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Abstract

Barium strontium titanate glass-ceramics were successfully produced with one major crystalline phase when Al2O3 was added to the melt. A dielectric constant of 1000 and a breakdown strength of 800 kV/cm was achieved; however the energy density was only measured to be 0.3–0.9 J/cm3. These energy density values were lower than anticipated due to the presence of dendrites and pores in the microstructure. Using BaF2 as a refining agent improved the microstructure and doubled the energy density for BST 80/20 samples. However, no refining agent reduced the increasing amount of hysteresis that developed with increasing applied electric field. This phenomenon is believed to be due to interfacial polarization.

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Acknowledgments

This research was performed while the author held a National Research Council Research Associateship Award at the U.S. Naval Research Laboratory. The authors would also like to acknowledge funding from the Office of Naval Research under contract #N0001404WX20802.

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Authors and Affiliations

  1. Multifunctional Materials Branch, The Naval Research Laboratory, Washington, DC, 20375, USA

    E. P. Gorzkowski, M.-J. Pan, B. Bender & C. C. M. Wu

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  1. E. P. Gorzkowski
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  2. M.-J. Pan
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  3. B. Bender
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  4. C. C. M. Wu
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Correspondence to E. P. Gorzkowski.

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Gorzkowski, E.P., Pan, MJ., Bender, B. et al. Glass-ceramics of barium strontium titanate for high energy density capacitors. J Electroceram 18, 269–276 (2007). https://doi.org/10.1007/s10832-007-9127-1

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  • DOI: https://doi.org/10.1007/s10832-007-9127-1

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