Ferroelectric phase transition and conduction mechanism of Li_2Pb_2La_2W_2Ti_4Ta_4O_(30)

摘要

The polycrystalline sample of Li_2Pb_2La_2W_2 Ti_4Ta_4O_(30) was synthesized by a high-temperature solid-state reaction route. Room temperature X-ray structural analysis and scanning electron micrograph show the formation of single phase high density compound. Existence of ferroelectricity in the in the compound was confirmed through detailed studies of its dielectric and polarization characteristics. From the impedance and modulus analysis it has been concluded that the charge carriers of the material have both short as well as long range order. Again, the electrical transport properties in the material are due to hopping of small polarons.