El-Naggar, Mohamed Y. and Boyd, David A. and Goodwin, David G. (2005) Characterization of highly-oriented ferroelectric Pb_xBa_(1-x)TiO_3. Journal of Materials Research, 20 (11). pp. 2969-2976. ISSN 0884-2914 http://resolver.caltech.edu/CaltechAUTHORS:20090917-123707099
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Pb_xBa_(1-x)TiO_3 (0.2 ≾ x ≾ 1) thin films were deposited on single-crystal MgO as well as amorphous Si_3N_4/Si substrates using biaxially textured MgO buffer templates, grown by ion beam-assisted deposition (IBAD). The ferroelectric films were stoichiometric and highly oriented, with only (001) and (100) orientations evident in x-ray diffraction (XRD) scans. Films on biaxially textured templates had smaller grains (60 nm average) than those deposited on single-crystal MgO (300 nm average). Electron backscatter diffraction (EBSD) has been used to study the microtexture on both types of substrates and the results were consistent with x-ray pole figures and transmission electron microscopy (TEM) micrographs that indicated the presence of 90° domain boundaries, twins, in films deposited on single-crystal MgO substrates. In contrast, films on biaxially textured substrates consisted of small single-domain grains that were either c or a oriented. The surface-sensitive EBSD technique was used to measure the tetragonal tilt angle as well as in-plane and out-of-plane texture. High-temperature x-ray diffraction (HTXRD) of films with 90° domain walls indicated large changes, as much as 60%, in the c and a domain fractions with temperature, while such changes were not observed for Pb_xBa_(1-x)TiO_3 (PBT) films on biaxially textured MgO/Si_3N_4/Si substrates, which lacked 90° domain boundaries.
|Additional Information:||© 2005 Materials Research Society. (Received 2 May 2005; accepted 28 June 2005) The authors thank Harry Atwater, Rhett Brewer, Mathew Dicken, and Jennifer Ruglovsky (Applied Physics, Caltech) for providing the IBAD MgO templates and Carol Garland for TEM work. This work was funded by the United States Department of Defense MURI award DAAD19-01-1-0517, administered by the Army Research Office.|
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|Deposited By:||George Porter|
|Deposited On:||05 Oct 2009 16:39|
|Last Modified:||26 Dec 2012 11:23|
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