Pb-induced temperature stabilization of high dielectric constant in barium neodymium titanates

Abstract

Dielectric properties of Pb-substituted titanates (Ba_i-aPb_a)_6-xNd_8+2x/3Ti₁₈O₅₄ were investigated at various x values. The results showed the formation of temperature stable dielectrics over the wide range of Pb concentrations. It has been found that the effect of Pb substitution on dielectric properties of sintered ceramics intensifies with a higher x while the solid solubility limit of Pb²⁺ ions decreases. Non-linear variation of dielectric characteristics against the lead concentration was shown to be due to the location of Pb²⁺ ions in different crystallo-graphic sites in the unit cell. New MW materials, differed by Pb content, with temperature stable and controllable dielectric constant of 80–100 have been developed.

Key Words:

• rare-earth titanates
• microwave dielectrics
• dieleciric constant