Structural and electric properties of epitaxial na0.5bi0.5tio3-based thin films

Magalhaes B, Engelhardt S, Molin C, Gebhardt SE, Nielsch K, Huhne R (2021)

Publication Type: Journal article

Publication year: 2021


Book Volume: 11

Article Number: 651

Journal Issue: 6

DOI: 10.3390/coatings11060651


Substantial efforts are dedicated worldwide to use lead-free materials for environmentally friendly processes in electrocaloric cooling. Whereas investigations on bulk materials showed that Na0.5Bi0.5TiO3 (NBT)-based compounds might be suitable for such applications, our aim is to clarify the feasibility of epitaxial NBT-based thin films for more detailed investigations on the correlation between the composition, microstructure, and functional properties. Therefore, NBT-based thin films were grown by pulsed laser deposition on different single crystalline substrates using a thin epitaxial La0.5Sr0.5CoO3 layer as the bottom electrode for subsequent electric measurements. Structural characterization revealed an undisturbed epitaxial growth of NBT on lattice-matching substrates with a columnar microstructure, but high roughness and increasing grain size with larger film thickness. Dielectric measurements indicate a shift of the phase transition to lower temperatures compared to bulk samples as well as a reduced permittivity and increased losses at higher temperatures. Whereas polarization loops taken at −100C revealed a distinct ferroelectric behavior, room temperature data showed a significant resistive contribution in these measurements. Leakage current studies confirmed a non-negligible conductivity between the electrodes, thus preventing an indirect characterization of the electrocaloric properties of these films.

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How to cite


Magalhaes, B., Engelhardt, S., Molin, C., Gebhardt, S.E., Nielsch, K., & Huhne, R. (2021). Structural and electric properties of epitaxial na0.5bi0.5tio3-based thin films. Coatings, 11(6).


Magalhaes, Bruno, et al. "Structural and electric properties of epitaxial na0.5bi0.5tio3-based thin films." Coatings 11.6 (2021).

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