Temperature Dependence of Energy Storage Density and Differential Permittivity and Bandgap Study of Relaxor (Pb,La)Zr_0.65Ti_0.35O₃

Abstract

Pb_(1-3x/2)La_xZr_0.65Ti_0.35O₃ (x = 6, 7, 8 and 9%) show diffusivity values as 1.55, 1.72, 1.94 and 2.18, respectively. The differential permittivity strongly depends on temperature and electric field and get maximum value at certain temperature and fields. These temperatures and fields vary with La-content. The maximum energy storage density observed is 131.90 mJ/cm³ with an efficiency of 82.26% for 6% doped sample. With increasing La-doping it is found to decrease. For 9% doped sample, it is 92 mJ/cm³ with an efficiency of 65%. The bandgap changes from 3.37 eV (6% La) to 3.26 eV (9% La).

Keywords:

• Energy storage
• differential permittivity
• relaxor
• bandgap