Perovskite phase stabilization in epitaxial Pb(Mg[sub 1/3]Nb[sub 2/3])O[sub 3]–PbTiO[sub 3] films by deposition onto vicinal (001) SrTiO[sub 3] substrates

Bu, S. D.; Lee, M. K.; Eom, C. B.; Tian, W.; Pan, X. Q.; Streiffer, S. K.; Krajewski, J. J.
November 2001
Applied Physics Letters;11/19/2001, Vol. 79 Issue 21, p3482
Academic Journal
We report the perovskite phase stabilization of 0.67Pb(Mg[sub 1/3]Nb[sub 2/3])O[sub 3]–0.33PbTiO[sub 3] (PMN-PT) epitaxial thin films by deposition onto miscut substrates. Films were grown on (001) SrTiO[sub 3] substrates with miscut angles from 0 to 8 degrees toward the [100] direction using 90° off-axis magnetron sputtering. Films on high miscut substrates (>4°) showed almost the pure perovskite phase in both x-ray diffraction and transmission electron microscopy image, and were nearly stoichiometric. In contrast, films on exact (001) SrTiO[sub 3] contained a high volume fraction of pyrochlore phases with Pb deficiency. Atomic force microscopy reveals that films on 8° miscut substrates have a much smoother surface morphology than those on exact (001) SrTiO[sub 3]. Cross-sectional transmission electron microscopy images reveal that the pyrochlore phases nucleate on top of the perovskite phase, and that the amount of the pyrochlore phases increase with film thickness. A film on an 8° miscut substrate exhibits a polarization hysteresis loop with a remnent polarization of 20 μC/cm[sup 2] at room temperature. © 2001 American Institute of Physics.


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