New perovskite-related oxides having high dielectric constant: Ln₂Ba₂CaZn₂Ti₃O₁₄ (Ln = La and Pr)

Abstract

Two new oxides, La₂Ba₂CaZn₂Ti₃O₁₄ and Pr₂Ba₂CaZn₂Ti₃O₁₄, have been synthesized by the ceramic route at 1100°C. These oxides crystallize in the disordered cubic structure with an 'a' lattice parameter of 3·9728 (2) and 3·9448 (5) respectively. These oxides show high dielectric constant (70 and 57) and low loss (0.003 and 0.013 at 100 kHz) for La₂Ba₂CaZn₂Ti₃O₁₄ and Pr₂Ba₂CaZn₂Ti₃O₁₄ respectively. The dielectric constant is highly stable with frequency and temperature.