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, https://doi.org/10.1016/j.oceram.2021.100120
The impact of lanthanum doping on the microstructure and colossal permittivity in BaxSr(1-x)TiO3
|Author:||Nurmi, Kari1; Jantunen, Heli1; Juuti, Jari1|
1Microelectronics Research Unit, Faculty of Information Technology and Electrical Engineering, University of Oulu, P.O. Box 4500, FIN-90014, Oulu, Finland
|Online Access:||PDF Full Text (PDF, 2.3 MB)|
|Persistent link:|| http://urn.fi/urn:nbn:fi-fe2021090745295
|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.
|Type of Publication:||
A1 Journal article – refereed
|Field of Science:||
213 Electronic, automation and communications engineering, electronics
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 (Academy of Finland Funding decision)
298409 (Academy of Finland Funding decision)
318203 (Academy of Finland Funding decision)
© 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 (http://creativecommons.org/licenses/by-nc-nd/4.0/).