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Studies on electrical properties of SrBi4Ti4−3xFe4xO15
N Venkat Ramulu G Prasad S V Suryanarayana T Bhima Sankaram
Volume 23 Issue 5 October 2000 pp 431-437
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https://www.ias.ac.in/article/fulltext/boms/023/05/0431-0437 -
Keywords
Layer structure compounds ;ferroelectrics ;piezoelectrics ;impedance ;dielectric properties -
Abstract
The system SrBi4Ti4−3xFe4xO15 belonging to bismuth layer structured ferroelectric (BLSF) materials withx = 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 Cole-Cole plots at higher temperatures are found to be semicircles. The relaxation times decrease with the increase of iron content.
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Author Affiliations
N Venkat Ramulu1 G Prasad1 S V Suryanarayana1 T Bhima Sankaram1
- Department of Physics, Osmania University, Hyderabad - 500 007, India
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Dates
- Published
- October 2000
- Manuscript received
- 16 June 2000
- Manuscript revised
- 10 July 2000
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