| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1646506 | Materials Letters | 2012 | 4 Pages |
Compositionally graded (1−x)Ba(Zr0.2Ti0.8)O3–x(Ba0.7Ca0.3)TiO3 {BCZT} thin films were deposited on LaNiO3 coated Si via the pulsed laser deposition technique to investigate permittivity temperature stability improvement. The results showed that the internal stress produced by the gradient of composition and different phase transition temperatures of constituent layers could be a dominant factor to influence the dielectric properties and temperature stability in different temperature regions. Graded film in the vicinity of morphotropic phase boundary displayed the highest tunability and the lowest temperature capacitance coefficient values. The maximum tunability of 63% and minimum temperature capacitance coefficient of 1.21×10−4 °C had been observed in the graded multilayered films compared to the single-layer BCZT film prepared in the identical conditions.
► Pulsed laser deposition of graded (1−x)Ba(Zr0.2Ti0.8)O3–x(Ba0.7Ca0.3)TiO3 multilayer. ► Diffused phase transition due to ferroelectric layers of different phase transitions. ► Improved dielectric properties due to polarization gradient and internal stresses. ► Maximum 77% reduction in TCC for graded multilayer as compared to BCZT50. ► Maximum 50% increase in FOM and 2.5 times increase in CQF for graded films.
