By a News Reporter-Staff News Editor at Science Letter -- Research findings on Applied Crystallography are discussed in a new report. According to news originating from Urbana, Illinois, by NewsRx correspondents, research stated, "Single crystals of Pb(Mg1/3Nb2/3)O-3-31% PbTiO3 (PMN-31% PT) are known for their complex domain structures at the nanometre scale. While their average symmetry has been studied by X-ray, neutron and electron diffraction methods, there is little knowledge about variations in symmetry at the local scale."
Our news journalists obtained a quote from the research from the University of Illinois, "Here, direct evidence is provided for the volume dependence and spatial dependence of symmetry fluctuations by using quantitative convergent beam electron diffraction and energy dispersive X-ray spectroscopy. Fluctuations in symmetry were determined by using different electron beam probe sizes ranging from similar to 2 to 25 nm from a crystal similar to 62 nm thick. The symmetry of PMN-31% PT was found to increase linearly as the average volume increased, and the local symmetry fluctuated from one location to another at the nanoscale. Energy dispersive X-ray spectroscopy indicates that chemical fluctuations are significant when the probe size decreases to similar to 2 nm."
According to the news editors, the research concluded: "The symmetry fluctuation is attributed to locally varying composition-dependent ionic displacements and spontaneous polarization."
For more information on this research see: Determination of fluctuations in local symmetry and measurement by convergent beam electron diffraction: applications to a relaxor-based ferroelectric crystal after thermal annealing. Journal of Applied Crystallography, 2013;46():1331-1337. Journal of Applied Crystallography can be contacted at: Wiley-Blackwell, 111 River St, Hoboken 07030-5774, NJ, USA. (Wiley-Blackwell - www.wiley.com/; Journal of Applied Crystallography - onlinelibrary.wiley.com/journal/10.1111/(ISSN)1600-5767)
The news correspondents report that additional information may be obtained from K.H. Kim, University of Illinois, Frederick Seitz Mat Res Lab, Urbana, IL 61801, United States. Additional authors for this research include D.A. Payne and J.M. Zuo (see also Applied Crystallography).
Keywords for this news article include: Urbana, Illinois, United States, Applied Crystallography, North and Central America
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