Studies on electrical properties of SrBi4Ti4�??3𝑥Fe4𝑥O15

[摘要] The system SrBi₄Ti_{4â€�??3ð‘�?}Fe_4ð‘�?O₁₅ belonging to bismuth layer structured ferroelectric (BLSF) materials with ð‘�? = 0, 0.1 and 0.2 has been prepared through solid-state double sintering method. Increase of iron content in SrBi₄Ti₄O₁₅ resulted in densification of the samples. The normal puckering observed in the sample has been found to decrease and the lattice distortion increased. Dielectric measurements indicate the ferroelectric transition temperature of the samples to be 530°C, 560°C and 606°C. The increase of transition temperature with increasing iron content is correlated with lattice distortion. Conductivity measurements show two slopes and the activation energies have been found to increase with the iron content. Impedance spectroscopy measurements confirm insulating behaviour at lower temperatures. With increase in temperature the samples become conducting and show relaxational effects. The Coleâ€�?�Cole plots at higher temperatures are found to be semicircles. The relaxation times decrease with the increase of iron content.

[学科分类] 材料工程

[关键词] Layer structure compounds;ferroelectrics;piezoelectrics;impedance;dielectric properties.