No Access Submitted: 06 November 2010 Accepted: 01 March 2011 Published Online: 11 April 2011
Appl. Phys. Lett. 98, 152901 (2011);
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  • Elena Aksel
  • Jennifer S. Forrester
  • Jacob L. Jones
  • Pam A. Thomas
  • Katharine Page
  • Matthew R. Suchomel
Bismuth-based ferroelectric ceramics are currently under intense investigation for their potential as Pb-free alternatives to lead zirconate titanate-based piezoelectrics. Na0.5Bi0.5TiO3 (NBT), one of the widely studied compositions, has been assumed thus far to exhibit the rhombohedral space group R3c at room temperature. High-resolution powder x-ray diffraction patterns, however, reveal peak splitting in the room temperature phase that evidence the true structure as monoclinic with space group Cc. This peak splitting and Cc space group is only revealed in sintered powders; calcined powders are equally fit to an R3c model because microstructural contributions to peak broadening obscure the peak splitting.
E.A. acknowledges partial support for this work by the U.S. National Science Foundation (NSF) under Award No. DMR-0746902. J.F. and J.J. acknowledge support from the U.S. Department of the Army under Grant No. W911NF-09-1-0435. Use of the Advanced Photon Source was supported by the U. S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357. The authors thank Dr. Graham King for helpful discussions.
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