(1-x)BaTiO3-x(Li0.5Bi0.5)TiO3 PTCR solid solution

(1-x)BaTiO₃-xLi_0.5Bi_0.5TiO₃ (0 ≤ × ≤ 0.6) based solid solutions were synthesized by solid state reaction technique. Materials were sintered in reducing atmosphere in the temperature range 1200-1400°C with subsequent oxidation in air at 700°C. Intermediate phases formed during synthesis of solid solutions were defined. It was shown that the change in the unit cell parameters of (1-x)BaTiO₃-xLi_0.5Bi_0.5TiO₃ solid solutions obeys Vegard´s law. It was determined that at room temperature lithium-bismuth titanate is unstable and has cubic symmetry. It was found that lithium-bismuth titanate and barium titanate based solid solutions exhibit a positive temperature coefficient of resistance (PTCR). With increasing of lithium-bismuth titanate content in (1-x)BaTiO₃-xLi_0.5Bi_0.5TiO₃, the minimum resistance value in the PTCR region increases, Curie temperature of solid solutions does not change, while the maximum of dielectric permittivity becomes diffused.