Valence compensated perovskite oxide system Ca1-xLaxTi1-xCrxO3 - Part I - Structure and dielectric behaviour

Attempts have been made to synthesize compositions with x = 0.01, 0.03, 0.0 5, 0.10, 0.20, 0.30 and 0.50 in the valence compensated system Ca1-xLaxTi1- xCrxO3 by solid state ceramic method. Solid solutions form upto x less than or equal to 0.50. All the compositions have been found to have orthorhombi c structure. The structure of the compositions upto x less than or equal to 0.10 is similar to that of CaTiO3. The structure changes gradually from Ca TiO3 to LaCrO3 in the composition range 0.10 < x < 0.50. Dielectric constan t, at room temperature, has been found to increase with increasing substitu ent concentration upto x = 0.30 and thereafter it decreases with increasing x upto 0.50. Orientational and space charge polarizations contribute to th e dielectric behaviour of these materials. (C) 2001 Kluwer Academic Publish ers.