Properties of highly (100) oriented Ba[sub 0.9]Sr[sub 0.1]TiO[sub 3]/LaNiO[sub 3] heterostructures prepared by chemical solution routes

Wang, G. S.; Cheng, J. G.; Meng, X. J.; Yu, J.; Lai, Z. Q.; Tang, J.; Guo, S. L.; Chu, J. H.; Li, G.; Lu, Q. H.
June 2001
Applied Physics Letters;6/25/2001, Vol. 78 Issue 26, p4172
Academic Journal
Highly (100) oriented Ba[sub 0.9]Sr[sub 0.1]TiO[sub 3]/LaNiO[sub 3] heterostructures have been grown on Si(100) using chemical solution routes. X-ray diffraction analysis shows that Ba[sub 0.9]Sr[sub 0.1]TiO[sub 3] thin films are high (100) orientation (α[sub 100]=0.92). Atomic force microscopy investigation shows that they have large grains about 80-200 nm. A Pt/Ba[sub 0.9]Sr[sub 0.1]TiO[sub 3]/LaNiO[sub 3] 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 ([C[sub max]-C[sub min]]/C[sub max]x100%) of 63%. The Ba[sub 0.9]Sr[sub 0.1]TiO[sub 3] thin films have high dielectric constant (ε) of 200 at 1 MHz. © 2001 American Institute of Physics.


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