College Park, Maryland June 6 - 10 , 2004
M3-C7 (3:15 PM): Direct observation of the formation of polar nano region in Pb(Mg1/3Nb2/3)O3 using neutron pair distribution function
I.-K JEONG, T. Darling, J.-K. Lee, T. Proffen, R. H. Heffner (Los Alamos National Laboratory), J. S. Park, K. S. Hong (Seoul National Univ.), W. Dmowksi (University of Tennessee), T. Egami (University of Tennessee; Oak Ridge National Laboratory)
We studied atomistic nature of Burns temperature and formation of polar nano region (PNR) in Pb(Mg1/3Nb2/3)O3 using neutron pair distribution function (PDF) over wide temperature range between 15 K to 1000 K. Temperature dependence PDF shows that new structural peaks develop as the temperature decreases below the Burns temperature even though the average structure remains cubic. The intensities of these new peaks increase as the temperature decreases. We expect that these new peaks are due to the formation of PNR below the Burns temperature and our result show the first direct observation of the formation of PNR below Burns temperature.
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