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

Aziz Nfissi; Yahya Ababou; Mounir Belhajji; Salaheddine Sayouri; Taj-dine Lamcharfi

doi:10.1142/S2010135X2150003X

Abstract

Structural and dielectric properties of Ce-doped

{BaTi}_{0.97}

Y_{0.03}

O₃ powders, with the chemical formulation (Ba

{_{1 -}}_{x}

{Ce}_{x})

(Ti(

{_{0.97 -}_{x}}_{/ 4})

-

Y_{0.03})

O₃ such as

x

= 0%, 1%, 3%, 5%, 7% and 9%, produced by the sol–gel method, have been investigated. X-ray diffraction analysis showed that Ce

^{3 +}

ions incorporated Ba sites until

x

= 7% indicating that this concentration represents a solubility limit of Ce

^{3 +}

ions in

{BaTi}_{0.97}

Y_{0.03}

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_{1 g}

mode, which we attributed to the effect of incorporation of Ce

^{3 +}

and Y

^{3 +}

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}_{0.97}

Y_{0.03}

O₃ sample, and reaches a value that should be below

40^{\circ}

C for

x

= 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.Structural and dielectric properties of Ce-doped

{BaTi}_{0.97}

Y_{0.03}