Influence of applied electric field annealing on the microwave properties of (Ba0.5Sr0.5)TiO3 thin films

Kwang Hwan Cho; Chil Hyoung Lee; Chong Yun Kang; Seok Jin Yoon; Young Pak Lee

doi:10.1063/1.2727560

Influence of applied electric field annealing on the microwave properties of (Ba_0.5Sr_0.5)TiO₃ thin films

Kwang Hwan Cho^*
, Chil Hyoung Lee
, Chong Yun Kang
, Seok Jin Yoon
, Young Pak Lee

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

10 Citations (Scopus)

Abstract

The effect of heat treatment in electric field on the structure and dielectric properties at microwave range of rf magnetron sputtering derived (Ba_0.5Sr_0.5)TiO₃ thin films have been studied. It has been demonstrated that postannealing in the proper electric field can increase the dielectric constant and the tunability. The increased out-of-plane lattice constant in the electric-annealed films indicated the formation of small polar regions with tetragonal structure, which are responsible for the increased dielectric constant and tunability. It was proposed that the segregation of Ti³⁺ ions caused by electric annealing could induce the formation of BaTiO₃-like regions, which are ferroelectric at room temperature. And in dielectric loss, as the Ti-O bonding lengths increase, the energy scattering on the ferroelectric mode also increases. So, the value of dielectric loss is slightly increased.

Original language	English
Article number	162905
Journal	Applied Physics Letters
Volume	90
Issue number	16
DOIs	https://doi.org/10.1063/1.2727560
Publication status	Published - 2007

Bibliographical note

Funding Information:
This research has been supported by Korea-Russia Joint Research Project. This work was also supported by the KOSEF through q-Psi.

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

Access to Document

10.1063/1.2727560

Cite this

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title = "Influence of applied electric field annealing on the microwave properties of (Ba0.5Sr0.5)TiO3 thin films",

abstract = "The effect of heat treatment in electric field on the structure and dielectric properties at microwave range of rf magnetron sputtering derived (Ba0.5Sr0.5)TiO3 thin films have been studied. It has been demonstrated that postannealing in the proper electric field can increase the dielectric constant and the tunability. The increased out-of-plane lattice constant in the electric-annealed films indicated the formation of small polar regions with tetragonal structure, which are responsible for the increased dielectric constant and tunability. It was proposed that the segregation of Ti3+ ions caused by electric annealing could induce the formation of BaTiO3-like regions, which are ferroelectric at room temperature. And in dielectric loss, as the Ti-O bonding lengths increase, the energy scattering on the ferroelectric mode also increases. So, the value of dielectric loss is slightly increased.",

author = "Cho, \{Kwang Hwan\} and Lee, \{Chil Hyoung\} and Kang, \{Chong Yun\} and Yoon, \{Seok Jin\} and Lee, \{Young Pak\}",

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AU - Lee, Chil Hyoung

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AU - Yoon, Seok Jin

AU - Lee, Young Pak

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AB - The effect of heat treatment in electric field on the structure and dielectric properties at microwave range of rf magnetron sputtering derived (Ba0.5Sr0.5)TiO3 thin films have been studied. It has been demonstrated that postannealing in the proper electric field can increase the dielectric constant and the tunability. The increased out-of-plane lattice constant in the electric-annealed films indicated the formation of small polar regions with tetragonal structure, which are responsible for the increased dielectric constant and tunability. It was proposed that the segregation of Ti3+ ions caused by electric annealing could induce the formation of BaTiO3-like regions, which are ferroelectric at room temperature. And in dielectric loss, as the Ti-O bonding lengths increase, the energy scattering on the ferroelectric mode also increases. So, the value of dielectric loss is slightly increased.

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