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 language | English |
|---|---|
| Pages (from-to) | 2129-2132 |
| Number of pages | 4 |
| Journal | Applied Surface Science |
| Volume | 255 |
| Issue number | 5 PART 1 |
| DOIs | |
| State | Published - 30 Dec 2008 |
| Externally published | Yes |
Keywords
- Dielectric materials
- Ferroelectric materials
- Perovskite
- Polycrystalline deposition
- Sol-gel processes
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