Dielectric properties of BaTiO3–Bi(Zn1/2Ti1/2)O3–NaNbO3 solid solutions

• Published in: Journal of materials science Vol. 48; no. 5; pp. 2245 - 2250
• Main Authors: Raengthon, Natthaphon, Brown-Shaklee, Harlan J., Brennecka, Geoff L., Cann, David P.
• Format: Journal Article
• Language: English
• Published: Boston Springer US 01.03.2013; Springer Nature B.V
• Subjects: Barium titanates; Characterization and Evaluation of Materials; Chemistry and Materials Science; Classical Mechanics; Composition; Crystallography and Scattering Methods; Dielectric properties; Materials Science; Permittivity; Perovskites; Polymer Sciences; Sodium compounds; Solid Mechanics; Solid solutions; Temperature; Temperature dependence; Relative Permittivity; Single Perovskite Phase; Sodium Niobate; BaTiO3; NaNbO3
• ISSN: 0022-2461; 1573-4803
• DOI: 10.1007/s10853-012-7000-3

In order to develop dielectric ceramics with temperature-stable permittivity characteristics, perovskite BaTiO 3 –Bi(Zn 1/2 Ti 1/2 )O 3 –NaNbO 3 ceramic solid solutions were investigated with a particular focus on effects of BaTiO 3 and NaNbO 3 contents on the dielectric properties of ternary compounds. Keeping the ratios of the other two constituents constant, decreasing the BaTiO 3 content leads to a broadening of the temperature-dependent permittivity maximum and a decrease in the overall permittivity. For compositions of constant BaTiO 3 content, replacing Bi(Zn 1/2 Ti 1/2 )O 3 with NaNbO 3 shifts the temperature of the maximum permittivity to lower temperatures (e.g., to −103 °C for a composition of 70BT–5BZT–25NN) while maintaining a broad permittivity peak with temperature, which for the 50BT–25BZT–25NN composition also satisfies the X9R standard. Thus, the investigation of BT–BZT–NN compounds resulted in promising dielectric properties with broad temperature ranges of high permittivity, which is of interest for advanced capacitor applications.