Comment on“Hole-pinned defect-dipoles induced colossal permittivity in Bi doped SrTiO_(3)ceramics with Sr deficiency”

作     者：Alexander Tkach Olena Okhay Alexander Tkach;Olena Okhay

作者机构：CICECO-Aveiro Institute of MaterialsDepartment of Materials and Ceramic EngineeringUniversity ofAveiroAveiro3810-193Portugal Centre for Mechanical Technology and Automation(TEMA)Department of Mechanical EngineeringUniversity of AveiroAveiro3810-193Portugal 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2021年第65卷第6期

页      面：151-153页

核心收录：

学科分类：08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 

基　　金：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 co-financed by FEDER under the PT2020 Partnership Agreement within FCT independent researcher grant IF/00602/2013 National funds(OE),through FCT,in the scope of the framework UID/EMS/00481/2019-FCT Centro 2020,through the European Regional Development Fund(ERDF),in the scope of the project CENTRO-01-0145-FEDER-022083 

主　　题：SrTiO_(3)ceramics Doped dielectrics Perovskite structure Giant permittivity 

摘      要：With this contribution,as a comment to the publication in Journal of Mate rials Science&Technology 44(2020)54,reporting giant dielectric response,structural characterization and numerical simulations in Sr_(1-1.5 x)Bi_xTiO_(3)ceramics,we show that the re ported 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 ***,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.