Structural and dielectric studies for the conduction mechanism analyses of lithium-niobate oxide ferroelectric ceramics

Add time:07/19/2019    Source:sciencedirect.com

Ferroelectric ceramic samples of lithium-niobate () material synthesized by solid-state reaction were investigated. Raman spectra analysis confirmed that the structure of these ceramics became more rigid with the rise of composition. Frequency and temperature dependencies of dielectric permittivity and electric modulus of these ceramics were studied in the ranges of frequency 1 Hz - 10 MHz and temperature 300 - 1000 °C, respectively. We found that both dielectric constant ε′ and loss ε′′ are high at lower frequencies and decrease with increasing of frequency. Furthermore, the electric modulus analyses reveal a non-Debye relaxation behavior and the shift in relaxation peak towards higher frequency range indicates a specific conduction process in the material and favoring of long-range motion of mobile charge carriers. Relaxation frequency extracted using imaginary part M′′ and conductivity measurements were found to follow the Arrhenius law, which indicate that the conduction process is thermally activated.

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