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Structure and phase transitions in 0.5(Ba0.7Ca0.3TiO3)-0.5(BaZr0.2Ti0.8O3) from -100 degrees C to 150 degrees C

Haugen, Astri Bjørnetun; Forrester, Jennifer S.; Damjanovic, Dragan; Li, Binzhi; Bowman, Keith J.; Jones, Jacob L.
Journal article, Peer reviewed
Accepted version
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BCZT_paper_resubmitted_2012-11-21.pdf (1.057Mb)
URI
http://hdl.handle.net/11250/2459155
Date
2013
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  • Institutt for materialteknologi [2777]
  • Publikasjoner fra CRIStin - NTNU [41955]
Original version
Journal of Applied Physics. 2013, 113 (1), .   10.1063/1.4772741
Abstract
The solid solution of (x)Ba0.7Ca0.3TiO3-(1-x)BaZr0.2Ti0.8O3 is known to exhibit high piezoelectric constants. Discrepancies in the reported phase transitions and structure around room temperature, however, have complicated the understanding of the enhanced properties. Rietveld refinement of high-resolution X-ray diffraction is employed here to establish and refine the crystallographic structure at temperatures from −100 °C to 150 °C for x = 0.5. A combination of rhombohedral R3m and tetragonal P4mm is found to coexist at temperatures of 20 °C and −25 °C, bordered by single phase rhombohedral and tetragonal regions at lower (i.e., −100 °C) and higher (i.e., 70 °C) temperatures, respectively. The diffractograms also show signs of strain and domain wall scattering that are linked to the sample history.
Publisher
AIP Publishing
Journal
Journal of Applied Physics

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