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Microstructure Observation of Complex Perovskite (1-x) $(Li_{1/2}Sm_{1/2})TiO_3-x (Na_{1/2}Sm_{1/2})TiO_3$ (LNST) System [2]  

Son, JJin-Ok (Department of Materials Science and Engineering, Korea University)
Nahm, Sahn (Department of Materials Science and Engineering, Korea University)
Lee, Hwack-Joo (New Materials Evaluation Center, Korea Research Institute of Standards and Science)
Publication Information
Applied Microscopy / v.34, no.2, 2004 , pp. 113-120 More about this Journal
Abstract
Microstructural characteristics of the Complex Perovskite (1-x) $(Li_{1/2}Sm_{1/2})TiO_3-x (Na_{1/2}Sm_{1/2})TiO_3$ (LNST) system have been investigated using the transmission electron microscopy (TEM). When $0.0{\leq}x{\leq}0.6$, the vacancy ordering forming the 1/2 (001) superlattice reflections due to the A-site cation deficiencies has apperaed. It could be confirmed by presence of ABPs. But it was difficult to form the vacancy ordering since vacancy concentration gradually lowered as the amount of the substituted Li ions decrease. Antiphase boundaries (APBs) were presented in microstructures of LNST when $0.8{\leq}x{\leq}1.0$. It was considered that these boundaries were caused by the 1:1 chemical ordering of A-site cations, Na and Sm ions. LNST had not only the antiphase tilting of oxygen octahedron but also the inphase tilting of oxygen octahedron and the antiparallel shift of cations all of them. It could be confirmed by presence of ferroelastic domains
Keywords
Antiphase boundary (APB); Complex Perovskite; Ferroelastic domain; Vacancy ordering;
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Times Cited By KSCI : 2  (Citation Analysis)
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