Ferroelectric (Pb,Sr)TiO3 epitaxial thin films on (001) MgO for room temperature high-frequency tunable microwave elements

Liu, S. W.; Weaver, J.; Yuan, Z.; Donner, W.; Chen, C. L.; Jiang, J. C.; Meletis, E. I.; Chang, W.; Kirchoefer, S. W.; Horwitz, J.; Bhalla, A.
October 2005
Applied Physics Letters;10/3/2005, Vol. 87 Issue 14, p142905
Academic Journal
Ferroelectric Pb0.35Sr0.65TiO3 (PSTO) thin films were grown on (001) MgO by using pulsed laser deposition. Microstructure studies from x-ray diffraction and electron microscopy indicate that the as-grown PSTO films have excellent single crystal quality and good epitaxial behavior with their c-axis oriented perpendicular to the plane of the films. The interface relationships between the PSTO films and MgO were determined to be [100]PSTO//[100]MgO and (001)PSTO//(001)MgO. The high frequency dielectric property measurements (up to 20 GHz) reveal that the as-grown films have a high dielectric constant value above 1420 and very large dielectric tunability above 34% at room temperature. These results suggest that the as-grown PSTO thin films on MgO are a good candidate for developing room-temperature high-frequency tunable microwave elements.


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