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Mechanical resonance and antiresonance frequencies were measured on barium titanate single-crystal elements maintained under electric dc bias from -50^ to +150^. A complete set of elastic, piezoelectric, and dielectric constants of the tetragonal modification at 25^ is obtained. The elastic compliances show substantial deviation from cubic symmetry. Measurements in the orthorhombic state show longitudinal compliance four times higher than in the tetragonal state.
Berlincourt et al. (Tue,) studied this question.