Structural and electrical properties of dipole-like substituted barium titanate

Abstract

Structural and electrical properties of Ba[(Ga_0.05,Ta_0.05)Ti_0.9]O₃ (BGT) and Ba_0.8Sr_0.2[(Ga_0.05,Ta_0.05)Ti_0.9]O₃ (BSGT) have been characterized to determine the effects of charge compensated dipole-like substitutions on temperature dependent material properties. BGT has a maxima in the relative permittivity curve that corresponds to a tetragonal (P4/mmm) to cubic ($\mathrm{Pm}\overline{3}\mathrm{m}$) phase transition which is consistent with the Rietveld refinement of XRD data. The ɛ_r value for BGT is 600 at 100 °C and varies by ∼25% over the temperature range [RT, 170 °C]. Sr addition in the B site of ABO₃ is performed to increase the relative permittivity value while maintaining the same trend of temperature insensitivity of relative permittivity.

Keywords:

• Barium titanate
• relaxor ferroelectrics
• diffuse phase transitions

Additional information

Funding

S. C. Tidrow would like to thank Kyocera for the Inamori Professorship from which funds supported this project.