Abstract
We report the local structures of the lead-containing mixed-ion perovskite Pb(Ni 3/2+1 Nb 3/5+2 )O3 (PNN), Pb(Fe 2/3+1 Nb 2/5+1 )O3 (PFN), and Pb(Zr 4+0.6 Ti 4+0.4 )O3 (PZT) by using a neutron total scattering analysis at low temperatures. Between PNN and PFN, we found that the Pb-O pair distributions were quite similar although they exhibited cubic and monoclinic average structures, respectively. Despite the similarity of the Pb-O pair distributions, the local structures of the B-cations in these compounds were rather different from each other. In the case of PZT, the Pb-O local structure was found to be distinctively different from those of other mixed-valence compounds. These comparisons among Pb-containing mixed-ion perovskites suggest that the valence distribution of the B-cation plays a crucial role in the Pb off-center displacement. Finally, we present the temperature evolution of the Pb-O pair distribution in PNN for temperatures from 300 K to 20 K. Based on this result, we show that a relative displacement of Pb and O against each other is an important feature of the local structure of the Pb ions.
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Jeong, I.K., Pandey, D. Local structure of lead-containing mixed-ion perovskite ferroelectrics studied using neutron total scattering analysis. Journal of the Korean Physical Society 61, 80–84 (2012). https://doi.org/10.3938/jkps.61.80
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DOI: https://doi.org/10.3938/jkps.61.80