Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/24706
Title: Composite thin films consisting of fine-grained barium strontium titanate for tunable microwave devices
Authors: Zhang, Y
Wang, G
Dong, X
Wang, Y 
Tang, X
Keywords: Barium strontium titanate
Composite thin films
Coplanar capacitor
Tunable
Issue Date: 2015
Publisher: Pergamon Press
Source: Ceramics international, 2015, v. 41, no. S1, p. S567-S571 How to cite?
Journal: Ceramics international 
Abstract: It has been reported that grain size has significant influence on the dielectric properties of barium strontium titanate (BST) thin films. In this paper we have proposed a multilayer structure in which BST layers are separated by thin MgO layers which are expected to function as barrier to atomic diffusion so that the grain size of BST could be confined. By simulation we have found that for a device with a coplanar/composite film/substrate configuration, the introduction of MgO can effectively change the dielectric constant of the composite while the tunability is not significantly affected, provided the amount of MgO is smaller than 25%. A prototype device was prepared to demonstrate the feasibility of this idea. By X-ray diffraction measurements it is revealed that BST and MgO coexist in the composite. The dielectric property of the composite film was determined and it was found that the film has a tunability of up to ~7% at 500 MHz and under an electric field of 13.3 kV/mm.
URI: http://hdl.handle.net/10397/24706
ISSN: 0272-8842
EISSN: 1873-3956
DOI: 10.1016/j.ceramint.2015.03.263
Appears in Collections:Conference Paper

Access
View full-text via PolyU eLinks SFX Query
Show full item record

Page view(s)

43
Last Week
0
Last month
Checked on Aug 14, 2017

Google ScholarTM

Check

Altmetric



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.