Author/Authors :
Shi Xiao، نويسنده , , Sen Deng، نويسنده , , Jingji Zhang، نويسنده , , Jialun Qin and Yilu Zhou، نويسنده , , Jiamin Tang، نويسنده , , Yidan Wang، نويسنده , , Lipeng Wang، نويسنده , , Hongfang Qi، نويسنده , , Jiangying Wang، نويسنده ,
Abstract :
A new lead-free perovskite system of BaTi1−x(Li2/3Nb2/3)xO3 (x = 0.02, 0.05, 0.07 and 0.10) has been synthesized by the mixed-oxide route. Temperature and frequency dependences of permittivity show a crossover from ferroelectric to relaxor behavior. For the samples with x ≥ 0.05, the frequency-dependent Tm satisfying the Vögel–Fulcher formula indicates a relaxor behavior. The increase with orders of magnitude in Ea with respect to x is possibly ascribed to more Ba-vacancies. Remnant polarization and strain decrease with increasing x due to phase transformation from ferroelectric tetragonal to paraelectric pseudocubic at room temperature.
Keywords :
Relaxor behavior , Strain behavior , Perovskite structure , phase transition
