Structural and dielectric properties of sol–gel processed Ce-doped BaTi0.97Y0.03O3 ceramics

Abstract

Structural and dielectric properties of Ce-doped BaTi[Formula: see text]Y[Formula: see text]O3 powders, with the chemical formulation (Ba[Formula: see text]Ce[Formula: see text](Ti([Formula: see text]- Y[Formula: see text]O3 such as [Formula: see text] = 0%, 1%, 3%, 5%, 7% and 9%, produced by the sol–gel method, have been investigated. X-ray diffraction analysis showed that Ce[Formula: see text] ions incorporated Ba sites until [Formula: see text]= 7% indicating that this concentration represents a solubility limit of Ce[Formula: see text] ions in BaTi[Formula: see text]Y[Formula: see text]O3 matrix. Scanning electron microscopy (SEM) analysis showed a decrease in grain size down to the same concentration of 7%. Raman spectroscopy analysis showed the appearance of A[Formula: see text] mode, which we attributed to the effect of incorporation of Ce[Formula: see text] and Y[Formula: see text] in BaTiO3 matrix. Dielectric measurements revealed that doping with cerium lowers the temperature of permittivity maximum at the ferroelectric-to-paraelectric transition (FPT) of the BaTi[Formula: see text]Y[Formula: see text]O3 sample, and reaches a value that should be below 40[Formula: see text]C for [Formula: see text]= 9%. Moreover, the phenomenon of dielectric resonance was observed on all Ce-doped samples, which was not the case with other dopants as reported in the literature.

Studies of Structural, Dielectric, and Impedance Spectroscopy of KBT-Modified Sodium Bismuth Titanate Lead-Free Ceramics

“…As indicated above, the dielectric constant of all specimens stays positive up to the resonant frequency ( f r ) and negative above this frequency. , In the case of pure NBT, as the frequency increases, the dielectric constant increases steadily, then, in the vicinity of the anomaly noted A, it increases and reaches a maximum, at this frequency, which corresponds to the so-called resonance frequency ( f r ), and then decreases rapidly for a frequency in the vicinity of the anomaly B, known as antiresonance ( f a ). This particular type of peaking behavior is associated with resonance mechanisms. − …”

Effects of yttrium doping on structural, electrical and optical properties of barium titanate ceramics

“…It provides an estimate of the number of voids are favorable for the A site cation. The Goldschmidt's tolerance factor of the synthesized samples were measured following relation [27].…”

Optimization of high temperature energy storage properties of PEI‐based composite dielectric based on rapid in‐situ growth of inorganic functional layer

“…But its inherently smaller ε r leads to a relatively lower energy density of the linear dielectric. Inorganic perovskite ceramics typically have a higher dielectric constant ( ε r ~ 10 2 –10 4 ) than polymer dielectrics 22–25 . In order to solve the above problems, researchers expect to improve the dielectric properties of polymer dielectrics by doping the polymer matrix with highly dielectric inorganic fillers 26–29 .…”

“…Inorganic perovskite ceramics typically have a higher dielectric constant (ε r $ 10 2 -10 4 ) than polymer dielectrics. [22][23][24][25] In order to solve the above problems, researchers expect to improve the dielectric properties of polymer dielectrics by doping the polymer matrix with highly dielectric inorganic fillers. [26][27][28][29] However, lower doping content is usually not significant for improvement of dielectric constant, while higher doping content leads to charge accumulation phenomenon, resulting in local electric field distortion, which is detrimental to improvement of energy density.…”