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Defect chemistry of nano-grained barium titanate films

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Abstract

Polycrystalline barium titanate thin films have been prepared with 100 ppm of B-site acceptor dopants Ca, Mg, and Mn via chemical solution deposition on base metal substrates. The films are fired in low pO2 atmospheres at 900 °C to prevent substrate oxidation. All dopant species produce low loss, space-charge free material without secondary reoxidation anneals. We note that the dopant concentrations required to compensate for oxygen non-stoichiometry are substantially greater than expected by equilibrium thermodynamic calculations. This observation is rationalized in the context of a composite oxygen defect model with differing reduction enthalpies for grain interiors and surfaces.

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Acknowledgements

The authors wish to acknowledge the financial support of E. I. du Pont de Nemours and Company.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC, 27695, USA

    Jon F. Ihlefeld, Mark D. Losego, Ramòn Collazo & Jon-Paul Maria

  2. The Pennsylvania State University, University Park, PA, 16802, USA

    Jon F. Ihlefeld

  3. DuPont Electronic Technologies, Research Triangle Park, NC, 27709, USA

    William J. Borland

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  1. Jon F. Ihlefeld
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  2. Mark D. Losego
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  3. Ramòn Collazo
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  4. William J. Borland
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  5. Jon-Paul Maria
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Correspondence to Jon F. Ihlefeld.

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Ihlefeld, J.F., Losego, M.D., Collazo, R. et al. Defect chemistry of nano-grained barium titanate films. J Mater Sci 43, 38–42 (2008). https://doi.org/10.1007/s10853-007-2135-3

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  • DOI: https://doi.org/10.1007/s10853-007-2135-3

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