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


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. (C) 2021 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.



subject category

Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering


Tkach, A; Okhay, O

our authors


This work was developed within the scope of the project CICECO-Aveiro Institute of Materials (UIDB/50011/2020 & UIDP/50011/2020), financed by the Portuguese national funds through the FCT/MCTES and when appropriate co-financed by FEDER under the PT2020 Partnership Agreement as well as within FCT independent researcher grant IF/00602/2013. National funds (OE), through FCT, in the scope of the frameworkUID/EMS/00481/2019-FCT and Centro 2020, through the European Regional Development Fund (ERDF), in the scope of the project CENTRO01-0145-FEDER-022083 are also acknowledged.

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