Improvement of dielectric tunability and loss tangent of (Ba,Sr)TiO3 thin films with K doping

doi:10.1088/1674-1056/21/9/097702

Abstract Ba_0.6Sr_0.4TiO₃ thin films doped with K were deposited on Pt/Ti/SiO₂/Si substrates by chemical solution deposition method. The structure, surface morphology, and dielectric and tunable properties of Ba_0.6Sr_0.4TiO₃ thin films have been studied in detail. The K content in Ba_0.6Sr_0.4TiO₃ thin films has a strong influence on the material's properties including surface morphology, dielectric and tunable properties. It is found that the Curie temperature of K-doped Ba_0.6Sr_0.4TiO₃ films shifts to higher values compared with that of undoped Ba_0.6Sr_0.4TiO₃ thin films, which leads to a dielectric enhancement of K-doped Ba_0.6Sr_0.4TiO₃ films at room temperature. At the optimized content of 0.02 mol, the dielectric loss tangent is reduced significantly from 0.057 to 0.020. Meanwhile, the tunability is enhanced obviously from 26% to 48% at the measured frequency of 1 MHz and the maximum value of the figure of merit is 23.8. This suggests that such films have potential applications for tunable devices.

Keywords: K-doped (Ba,Sr)TiO₃ thin films chemical solution deposition dielectric properties tunability

Received: 24 February 2012
Revised: 06 March 2012
Published: 01 August 2012

PACS:	77.55.-g	(Dielectric thin films)
	77.55.fe	(BaTiO3-based films)
	61.05.cp	(X-ray diffraction)

Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 10874051 and 50802096) and the Innovation Project for Young Talents of Hefei Institutes of Physical Science, Chinese Academy of Sciences (Grant No. O84N391123).

Corresponding Authors: Dai Jian-Ming
E-mail: jmdai@issp.ac.cn

Cite this article:

Zhang Wei-Jie, Dai Jian-Ming, Zhu Xue-Bin, Chang Qing, Liu Qiang-Chun, Sun Yu-Ping Improvement of dielectric tunability and loss tangent of (Ba,Sr)TiO₃ thin films with K doping 2012 Chin. Phys. B 21 097702

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