Detailed structure analyses on Cobalt doped PbTiO 3 powders


Erünal E.

TURKISH JOURNAL OF CHEMISTRY, vol.50, pp.1-22, 2022 (Journal Indexed in SCI Expanded)

  • Publication Type: Article / Article
  • Volume: 50
  • Publication Date: 2022
  • Doi Number: 10.3906/kim-2109-58
  • Title of Journal : TURKISH JOURNAL OF CHEMISTRY
  • Page Numbers: pp.1-22

Abstract

The identification of the defects and secondary phases which significantly affect the material
properties are of crucial importance. In this study, a systematic structure examination of PbTiO 3
and cobalt doped PbTiO3 powder ceramics were carried out. X-ray diffraction (XRD), Fourier-
transform infrared (FT-IR), Raman and electron paramagnetic resonance (EPR) spectroscopies
were applied along with non-simultaneous thermogravimetric analysis (TGA) and differential
scanning calorimetry (DSC). The doped and undoped PbTiO3 materials were synthesized via a
practical sol-gel route that takes place at 50 ºC. The perovskite formation for both materials was
verified. The dislocation density of cobalt doped PbTiO 3 was found to be 0.0121 nm-2 while it was
0.00239 nm-2 for the undoped material. Besides, a strong strain effect was observed for cobalt
doped PbTiO 3 via XRD. This was attributed to Co 3O 4 phase which was detected through EPR and
FT-IR analyses. The formation of Co3 O4 phase during synthesis revealed the previously
unexpected non-improved ferroelectric behavior for cobalt doped PbTiO3 . The dielectric constant

and the dielectric loss (tan δ) of cobalt doped PbTiO 3 were estimated as 1066 and 0.8370,
respectively.