On the Phase Transition in Barium-Lead Titanate (II)

The dilatometric and specific heat measurements have been made on the whole range of solid solutions of (Pb-Ba) TiO 3 system. The linear thermal expansion coefficient, in the tetragonal region decreases with increasing Pb content and it becomes even negative on the PbTiO 3 side, whereas the expansion coefficient in the cubic region is almost constant independent of the compositions. Anomaly of the specific heat also increases considerably towards PbTiO 3 , just corresponding to the dilatometric data and to previously reported X-ray data.