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정일경,Dhananjai Pandey 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.61 No.3
We report the local structures of the lead-containing mixed-ion perovskite Pb(Ni 1 3/2+ Nb 2 3/5+ )O3 (PNN), Pb(Fe 1 2/3+ Nb 1 2/5+ )O3 (PFN), and Pb(Zr 0.6 4+ Ti 0.4 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.
정일경,Dhananjai Pandey 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.61 No.1
We report the local structures of the lead-containing mixed-ion perovskite Pb(Ni<sup>2+</sup><sub>1/3</sub>Nb<sup>5+</sup><sub>2/3</sub>)O<sub>3</sub> (PNN), Pb(Fe<sup>3+</sup><sub>1/2</sub>Nb<sup>5+</sup><sub>1/2</sub>)O<sub>3</sub> (PFN), and Pb(Zr<sup>4+</sup><sub>0.6</sub>Ti<sup>4+</sup><sub>0.4</sub>)O<sub>3</sub> (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.