Jump to main content
Jump to site search


SrTiO3-BaTiO3 nanocomposites with temperature independent permittivity and linear tunability fabricated by field-assisted sintering from chemically synthesized powders

Abstract

SrTiO3-BaTiO3 nanocomposites with tailored microstructure exhibit enhanced dielectric properties in comparison to homogeneous ceramics with the same overall composition, including stable permittivity (830±60) over a wide temperature range (-150 to 50°C), low losses (≤ 3% between -150 to 150°C)), small dc conductivity (<10-10 S/m) and reasonable tunability (20% at 35 kV/cm) with almost linear and weakly hysteretic behavior. The composites were fabricated from a SrTiO3-BaTiO3 powder synthesized in situ by a multi-step aqueous solution process. The powder was consolidated by a high-pressure rapid field-assisted sintering method. Good densification without grain growth and only partial interdiffusion between the two perovskites was obtained. The enhanced dielectric properties largely originate from the existence of local composition gradients which determine a distribution of the Curie temperature and, consequently, the formation of a broad permittivity plateau. The fine-grained microstructure and the composite effect further contribute to suppress the temperature dependence of dielectric permittivity while retaining a reasonable tunability.

Back to tab navigation

Publication details

The article was received on 13 Jun 2017, accepted on 03 Aug 2017 and first published on 04 Aug 2017


Article type: Paper
DOI: 10.1039/C7TC02629C
Citation: J. Mater. Chem. C, 2017, Accepted Manuscript
  •   Request permissions

    SrTiO3-BaTiO3 nanocomposites with temperature independent permittivity and linear tunability fabricated by field-assisted sintering from chemically synthesized powders

    M. Airimioaei, M. T. Buscaglia, I. G. Tredici, U. Anselmi-Tamburini, C. E. Ciomaga, L. P. Curecheriu, A. Benčan, V. BUSCAGLIA and L. Mitoseriu, J. Mater. Chem. C, 2017, Accepted Manuscript , DOI: 10.1039/C7TC02629C

Search articles by author

Spotlight

Advertisements