The influence of rare earth elements (Pr, Gd, Ho, Er, Yb, and Lu) on the dielectric constant-temperature characteristics of the BaTiO3-MgO-MnO2 system for automotive applications was investigated. In the case of Yb- and Lu-doped BaTiO3, the Curie point shifted to a higher temperature and the peak widths were broadened by the addition of smaller radii rare earth elements. It was found that the ionic radius of rare earth elements had a major effect in controlling the temperature coefficient of capacitance. The addition of rare-earth elements with smaller ionic radii led to an improvement in the temperature dependence of dielectric properties.

Keywords: BaTiO3, dielectric, rare-earth element, temperature-capacitance characteristics (TCC)