University of Oulu

Kari Nurmi, Heli Jantunen, Jari Juuti, The impact of lanthanum doping on the microstructure and colossal permittivity in BaxSr(1-x)TiO3, Open Ceramics, Volume 6, 2021, 100120, ISSN 2666-5395,

The impact of lanthanum doping on the microstructure and colossal permittivity in BaxSr(1-x)TiO3

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Author: Nurmi, Kari1; Jantunen, Heli1; Juuti, Jari1
Organizations: 1Microelectronics Research Unit, Faculty of Information Technology and Electrical Engineering, University of Oulu, P.O. Box 4500, FIN-90014, Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 2.3 MB)
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Language: English
Published: Elsevier, 2021
Publish Date: 2021-09-07


In this work BaSrTiO3 with three different Ba/Sr (45/55, 55/45 and 65/35) ratios and lanthanum doping concentrations of 0, 0.2, 0.4 and 0.6 ​mol.% were studied. Samples were fabricated through the mixed oxide route. The microstructures were analyzed and the phases of the compositions were defined by XRD. The increase in lanthanum doping had a pronounced decreasing effect on the grain size. The temperature dependent dielectric characteristics were measured between 0.1 and 1000 ​kHz in the temperature range of -68–150 ​°C. Colossal permittivity was found in all doped samples with a Ba/Sr ratio of 65/35 from which the 0.6 ​mol. % doping level of lanthanum showed the most promising characteristics with relative permittivity >48,000 and a dielectric loss ≤0.06 over the whole temperature range below 1 ​kHz. It was found that the relaxation of the colossal permittivity effect exhibited a frequency shift at the Curie temperature.

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Series: Open ceramics
ISSN: 2666-5395
ISSN-L: 2666-5395
Volume: 6
Article number: 100120
DOI: 10.1016/j.oceram.2021.100120
Type of Publication: A1 Journal article – refereed
Field of Science: 213 Electronic, automation and communications engineering, electronics
Funding: Authors Jari Juuti and Kari Nurmi gratefully acknowledges funding of the Academy of Finland (decision No. 267573, 298409 and 318203). Author K. N. gratefully acknowledges Tauno T€onning foundation for financial support.
Academy of Finland Grant Number: 267573
Detailed Information: 267573 (Academy of Finland Funding decision)
298409 (Academy of Finland Funding decision)
318203 (Academy of Finland Funding decision)
Copyright information: © The Authors 2021. Published by Elsevier Ltd on behalf of European Ceramic Society. his is an open access article under the CC BY-NC-ND license (