Brillouin light scattering was used to obtain the elastic and piezoelectric constants for tetragonal PbTiO3 single crystals at room temperature. Approximately 170 measurements of longitudinal and transverse acoustic wave velocities were inverted using literature dielectric constant values to obtain the full set of elastic and piezoelectric constants. Our data indicate a greater electromechanical anisotropy in the polar c direction than previously reported, but are otherwise in general agreement with previous studies. We discuss briefly the degree to which individual elastic and piezoelectric constants are resolved.
One of the problems in crystal growth of the high-temperature superconductor YBa 2 Cu 3 0 7 _x is the separation of the grown crystals from residual flux. This is overcome by smooth suction of the liquid by means of porous ceramic dipped into the liquid at the end of the experiment.
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