Highly (100) oriented Ba0.9Sr0.1TiO3/LaNiO3 heterostructures have been grown on Si(100) using chemical solution routes. X-ray diffraction analysis shows that Ba0.9Sr0.1TiO3 thin films are high (100) orientation (α100=0.92). Atomic force microscopy investigation shows that they have large grains about 80–200 nm. A Pt/Ba0.9Sr0.1TiO3/LaNiO3 capacitor has been fabricated and showed excellent ferroelectricity, the remnant polarization and coercive field are 10.8 μC/cm2 and 96 kV/cm, respectively. The electric field dependence of capacitance measurement shows that the capacitor has large capacitance tuning ([Cmax−Cmin]/Cmax×100%) of 63%. The Ba0.9Sr0.1TiO3 thin films have high dielectric constant (ε) of 200 at 1 MHz.
At very low temperature (450 • C), (111)-oriented and polycrystalline 0.7Pb(Mg 1/3 Nb 2/3 ) O 3 -0.3PbTiO 3 (PMN-PT) thin films have been grown on platinum (Pt) and lanthium niobate (LaNiO 3 ) bottom electrodes respectively. Macroscopic measurements reveal lower coercive fields for PMN-PT grown on LaNiO 3 compared to on platinum, while the piezoelectric coefficient d 33 is greater. At the nanometer scale, local piezoelectric hysteresis loops show that the voltages required for domain switching and piezoelectric response are the highest for PMN-PT deposited on LaNiO 3 . The electrical results can be explained by taking into account the effects induced by both electrodes on the surface morphology and structural properties of the films.
Slim-loop ferroelectric ceramics of Pb (Zr,Sn,Ti)O 3 were prepared by partial replacing Pb with Ba and La, and replacing Zr, Sn, and Ti with Nb. The saturation polarization (P s ) and remnant polarization (P r ) were measured to be 20.66 µC/cm 2 and 0.55 µC/cm 2 , respectively. A relative permittivity ε ≈ 2840 can be reached in these ferroelectric ceramics at room temperature and frequency of 1kHz. The discharge energy density (w) increases in a nearly linearity with the voltage. A discharge energy density of about 0.410J/cm 3 can be obtained at the electrical field of 6000 V/mm. Pulse chargedischarge measurements were conducted and the releasing charges Q retained 80% after 1000 cycles. These ferroelectric ceramics have potential for pulse power capacitor applications.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.