Abstract
A simple model of a porous ferroelectric explains the change of the dielectric constant with density. This model agrees well with the experimental results. Certain barium titanate powders show a low spontaneous strain so that their structure at room temperature appears to be cubic rather than tetragonal. Compacts prepared from such a powder exhibit an increase in spontaneous strain with increasing density, and this is explained with a model that is based on Devonshire’s thermodynamic theory.
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References
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Stadelmaier, H.H., Derbyshire, S.W. (1966). Variation of Dielectric Constant and Spontaneous Strain With Density in Polycrystalline Barium Titanate. In: Kriegel, W.W., Palmour, H. (eds) The Role of Grain Boundaries and Surfaces in Ceramics. Materials Science Research. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-6311-6_7
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DOI: https://doi.org/10.1007/978-1-4899-6311-6_7
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