The impact of lanthanum doping on the microstructure and colossal permittivity in BaxSr(1-x)TiO3
Nurmi, Kari; Jantunen, Heli; Juuti, Jari (2021-05-11)
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 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/).
https://creativecommons.org/licenses/by-nc-nd/4.0/
https://urn.fi/URN:NBN:fi-fe2021090745295
Tiivistelmä
Abstract
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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