Microwave dielectric properties of BaTiO3 and Ba0.5Sr0.5TiO3 thin films on (001) MgO

作者：Alldredge L M B^*; Chang Wontae; Kirchoefer Steven W; Pond Jeffrey M

来源：Applied Physics Letters, 2009, 95(22): 222902.

DOI：10.1063/1.3264051

• barium compounds
• compressive strength
• dielectric losses
• dielectric polarisation
• ferroelectric thin films
• microwave materials
• permittivity
• piezoelectricity
• strontium compounds

The microwave properties of BaTiO3 and Ba0.5Sr0.5TiO3 films were characterized as a function of in-plane film strain, crystallographic direction, film distortion, and dc bias. The strain dependence of BaTiO3 and Ba0.5Sr0.5TiO3 films showed an opposite pattern at room temperature, going from compression to tension, or vice versa. At zero bias, the dielectric constant and dielectric loss showed little dependence on direction ([100] and [110]). However, the tunability was consistently smaller along the [110] direction than along [100]. These observations agreed well with our previous work on how polarizations (both ionic and spontaneous) form and contribute to the nonlinear dielectric behavior.

• 出版日期2009-11-30