Dielectric and Piezoelectric Properties of (Na0.5Bi0.5)(Ti1–xMnx)O3 (x = 0–0.1) Modified Ceramics

• Published in: Inorganic materials 2021, Vol.57 (9), p.942-949
• Main Authors: Politova, E. D., Kaleva, G. M., Bel’kova, D. A., Mosunov, A. V., Sadovskaya, N. V., Kiselev, D. A., Il’ina, T. S., Shvartsman, V. V.
• Format: Article
• Language: English
• Subjects: Anomalies; Bismuth titanate; Ceramics; Chemistry; Chemistry and Materials Science; Crystal structure; Curie temperature; Industrial Chemistry/Chemical Engineering; Inorganic Chemistry; Manganese; Materials Science; Permittivity; Perovskite structure; Perovskites; Phase transitions; Piezoelectricity; Polar environments; Room temperature; Sodium; Unit cell
• ISSN: 0020-1685; 1608-3172
• DOI: 10.1134/S0020168521090120

— We have studied the crystal structure and dielectric and local piezoelectric properties of (Na 0.5 Bi 0.5 )(Ti 1 –x Mn x )O 3 ( x = 0–0.1) modified sodium bismuth titanate-based ceramics and observed the formation of a pseudocubic phase with the perovskite structure. Its unit-cell volume first decreases and then, for x ≥ 0.05, increases. The ceramics undergo phase transitions, which show up as anomalies in their dielectric permittivity near ~450 K and peaks at a Curie temperature of ~600 K. As x increases to 0.04, their Curie temperature decreases by 40 K. The phase transitions near 450 K exhibit well-defined relaxor behavior due to the presence of polar regions in the nonpolar matrix. The samples with x < 0.05 have been shown to have an increased room-temperature dielectric permittivity, which correlates with the increased effective piezoelectric coefficient, suggesting that doping with manganese has an advantageous effect on the functional properties of sodium bismuth titanate ceramics.