J. Mater. Sci. Technol. ›› 2021, Vol. 65: 151-153.DOI: 10.1016/j.jmst.2020.05.064

• Editorial • Previous Articles     Next Articles

Comment on “Hole-pinned defect-dipoles induced colossal permittivity in Bi doped SrTiO3 ceramics with Sr deficiency”

Alexander Tkacha,*(), Olena Okhayb   

  1. aCICECO - Aveiro Institute of Materials, Department of Materials and Ceramic Engineering, University of Aveiro, Aveiro, 3810-193, Portugal
    bCentre for Mechanical Technology and Automation (TEMA), Department of Mechanical Engineering, University of Aveiro, Aveiro, 3810-193, Portugal
  • Received:2020-04-16 Revised:2020-05-03 Accepted:2020-05-05 Published:2021-02-28 Online:2021-03-15
  • Contact: Alexander Tkach
  • About author:* E-mail address: atkach@ua.pt (A. Tkach).

Abstract:

With this contribution, as a comment to the publication in Journal of Materials Science & Technology 44 (2020) 54, reporting giant dielectric response, structural characterization and numerical simulations in Sr1-1.5xBixTiO3 ceramics, we show that the reported results are rather contradicting and not well analysed, while the suggested mechanism for the giant permittivity response is not valid or doubtful and has to be reconsidered. Moreover, many details and data are missing making impossible not only to call the obtained results very suitable for practical application but even to reproduce them.

Key words: SrTiO3 ceramics, Doped dielectrics, Perovskite structure, Giant permittivity