Abstract
When the dielectric constant for barium titanate crystal is calculated in terms of pressure, temperature and polarization from Devonshire's free energy function and then introduced into the conductivity calculation for semiconductive barium titanate ceramics, the effect of pressure on conductivity can be theoretically predicted. Using this approach, the presence of an extraordinarily high temperature coefficient of resistivity at Curie point can also be predicted, if the internal stresses are included in the conductivity calculation. Agreement was found between the theoretically predicted and the experimentally measured pressure effect on resistivity.
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