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Ba 0.5 Sr 0.5 TiO 3 /Bi 1.5 Zn 1 .0 Nb 1.5 TiO 7 multilayer thin films prepared by sol-gel method

  • Key Lab of the Ministry of Education for Process Control and Efficiency Egineering

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15 Scopus citations

Abstract

Ba 0.5 Sr 0.5 TiO 3 /Bi 1.5 Zn 1 .0 Nb 1.5 O 7 (BST/BZN) multilayer thin films were prepared on Pt/Al 2 O 3 substrates by sol-gel method. The structure, morphology, and tunable dielectric properties of BST/BZN thin films were investigated. X-ray diffraction results showed that the structure of BST/BZN multilayer thin films was composed of a cubic BZN pyrochlore phase and a cubic BST perovskite phase. The diffraction pattern confirmed that there was no measurable reaction occurred between the BST and BZN layers. The field-emission scanning electron microscope (FESEM) showed that the surface of BST/BZN multilayer thin films was crack-free and compact. The dielectric constant and loss tangent of the BST/BZN multilayer thin films were 106 and 0.011 at 10 kHz, respectively. The dielectric tunability was 10% under dc bias field of 355 kV/cm at 10 kHz. The medium dielectric constant, low loss tangent and tunability of the dielectric constant suggest that BST/BZN multilayer thin films have potential application for tunable microwave device applications.

Original languageEnglish
Pages (from-to)2129-2132
Number of pages4
JournalApplied Surface Science
Volume255
Issue number5 PART 1
DOIs
StatePublished - 30 Dec 2008
Externally publishedYes

Keywords

  • Dielectric materials
  • Ferroelectric materials
  • Perovskite
  • Polycrystalline deposition
  • Sol-gel processes

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