Synthesis and characterization of a new ferroelectric oxide Li2Pb2Pr2W2Ti4Ta4O30

• The material has high dielectric constant and low loss at room temperature.
• It has good ferroelectric properties as observed hysteresis loop useful for FRAM.
• The material has semiconducting nature as calculated from impedance spectroscopy.

A new polycrystalline ferroelectric oxide of tungsten bronze structural family has been synthesized by high temperature (∼1150 °C) mixed-oxide route. Room temperature X-ray analysis data confirms the formation of a single phase compound. Microstructure of the material was studied from scanning electron microscope image, which clearly shows the formation of high density pellet sample. Detailed studies of dielectric constant, tangent loss and polarization with temperature confirmed the existence of ferroelectric properties in the material with transition temperature much above room temperature. Study of electrical properties of the material exhibits a strong correlation between its micro-structure. The electrical transport properties of the material suggest the existence of non-exponential-type of conductivity relaxation.

Variation of relative dielectric constant and tangent loss (tan δ) with temperature of LPPWTT.Figure optionsDownload as PowerPoint slide