Abstract
BaTiO3 and Ba0.9925Er0.0075TiO3 ceramics were investigated regarding their dielectric and microstructure properties via conventional solid state reaction method. The phase pure samples were obtained when heated at 1400°C for overnight. The effect of Er3+ doped into BaTiO3 on dielectric properties and microstructural properties was investigated for composition of BaTiO3 and Ba0.9925Er0.0075TiO3. The analysis was made by X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and Impedance Analyzer. The XRD patterns of BaTiO3 and Ba0.9925Er0.0075TiO3 are phase pure and identical with tetragonal perovskite structure with space group of P4mm. The lattice parameters and unit cell volume of BaTiO3 increased by doping with Erbium as the crystallite size decreased. Measurements of dielectric properties were carried out as a function of temperature up to 200°C at different frequencies. Ba0.9925Er0.0075TiO3 exhibit the high value of dielectric constant (ε=6179) at Curie temperature (TC) of 120°C. SEM analysis of BaTiO3 and Ba0.9925Er0.0075TiO3 ceramics showed that the grain sizes of BaTiO3 and Ba0.9925Er0.0075TiO3 were ranged from 3.3µm-7.8µm and 2.2µm-4.7µm respectively.
Highlights
The Barium titanate (BaTiO3) – based ferroelectric ceramics have gained importance in electronic industry as they have high dielectric constant and offer wide range of applications such as capacitors, sensors, actuators, power transmission devices, memory devices and high energy storage devices [1,2]
The influence of dopant ion depends on the substitutional site (Ba2+ or Ti4+) as well as on the defects itself
La3+ and Ce3+will substitute into A- site whereas the ions with bigger ionic radii such as Lu3+ and Yb3+ possibly substitute at B site of BaTiO3 structure
Summary
The Barium titanate (BaTiO3) – based ferroelectric ceramics have gained importance in electronic industry as they have high dielectric constant and offer wide range of applications such as capacitors, sensors, actuators, power transmission devices, memory devices and high energy storage devices [1,2]. Ba1-xErxTiO3, increase in dielectric constant is observed. The grains size distribution was measured using SEM image analysis software, Smile same and show the single phase tetragonal perovskite structure with space group of P4mm. The lattice parameters and unit cell volume for the sample BaTiO3 composition sintered at 1400oC were a = 3.9918 Å and c = 4.0338 Å and unit cell volume, V = 64.28 Å3.
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