Structural Behavior in the System (Ba, Ca, Sr) TiO3 and Its Relation to Certain Dielectric Characteristics

The effect of strontium additions on the immiscibility region between barium titanate and calcium titanate was studied and it was found that the two‐phase gap is closed by about 18% strontium titanate when the specimens are fired at 1430°C.; at lower firing temperatures the gap is greater and there is evidence of incomplete reaction. The effect of different firing temperatures on the dielectric properties of bodies in this region is discussed and the theoretical conclusions are supported by experimental data. The strontium titanate‐calcium titanate binary was studied and the phase boundaries (cubic‐tetragonal, tetragonal‐orthorhombic) were located with regard to changing composition and temperature.