resumo
Lead-free relaxor ferroelectrics are promising materials for energy storage applications. To find new material systems for electrostatic capacitors, many researches have dedicated their work to formulate new ecologically safe compositions. In our study, we have prepared (1-x)Ba(Ti0.93Sn0.07)O3-xBiYO3 (BTS7-BY) solid solutions via the solid-state method. The parent composition, Ba(Ti0.93Sn0.07)O3 is a ferroelectric-relaxor crossover material. It reduces its remanent polarization while still maintaining a high maximum polarization. Moderate substitution with BiYO3 further lowers the remanent polarization, resulting in slimmer polarization loops and increasing the energy storage efficiency to 90 %. Samples with x >= 0.06 show a true relaxor behavior with linear-like polarization loops with character of weakly-coupled relaxors. Breakdown strength measurements reveal a reduced breakdown strength with increasing BY content. Further investigations of the electrostriction, the band gap, and the electrical microstructure link the homogeneity and grain size of the microstructure to the resulting breakdown strength. This highlights the importance of a homogenous and small-grained microstructure for enhancing the energy storage properties. Samples with x = 0.06 exhibit the best energy storage properties with a recoverable energy density of 1.11 J/cm3 at 189 kV/cm with an energy storage efficiency of 74%.
palavras-chave
GRAIN-BOUNDARY; BREAKDOWN; CERAMICS; GROWTH
categoria
Materials Science
autores
Kröll, E; Devecioglu, L; Salak, AN; Piotrowsky, L; Shvartsman, VV; Lupascu, DC
nossos autores
Andrei Salak
Investigador PrincipalProjectos
CICECO - Aveiro Institute of Materials (UIDB/50011/2020)
CICECO - Aveiro Institute of Materials (UIDP/50011/2020)
Associated Laboratory CICECO-Aveiro Institute of Materials (LA/P/0006/2020)
agradecimentos
Eva Kroell acknowledges partial financial support through DFG project Lu 729/25 (436254098). Eva Kroell, Vladimir V. Shvartsman, and Andrei N. Salak acknowledge the support of the bilateral Portugal-Germany (FCT-DAAD) project PZT-FREE (grant 57610755). The research done in the University of Aveiro was supported by the project CICECO-Aveiro Institute of Materials, UIDB/50011/2020, UIDP/50011/2020 & LA/P/0006/2020, financed by national funds through the FCT/MEC (PIDDAC).