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Structural, optical, dielectric, and pyroelectric properties of crystals and ceramics of BaAl2O4 have been investigated. A refinement of the atomic positions has been carried out from X-ray powder diffraction data. BaAl2O4 is ferroelectric with TC=396K. The thermal behavior of Ps shows a broad maximum close to 220K without any phase transition. A model is proposed on the basis of the existence in the unit cell of two partial polarizations. A fit of the coefficients of the Landau free energy expansion allows the calculation of the thermal variations of these partial polarizations. A possible crystal structure is proposed for the paraelectric phase.
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Huang et al. (1994) studied this question.
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