Abstract
Dielectric, lattice constant, and thermal‐expansion measurements have been made on solid solution ceramics in the systems PbTiO3Pb0.5NbO3 and PbTiO3‐Pbo.5TaO3. The ferro‐electric Curie temperature is lowered to 465OC. at the solubility limit (2 to 5% Nb or Ta). Replacement of Ti4+ by Nb5+ or Ta5+ in these perovskite‐type solid solutions is accompanied by the creation of cation vacancies. These vacancies seem to facilitate material transport and aid sintering. Thus ceramics were obtained with up to 91% of theoretical density. These compositions have peak dielectric constants of the order of 10,000 with tan δ less than 0.1 in the interval 25° to 525°C.
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