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• 作者：Mitsuko Onoda ; Zhaoping Liu ; Yasuo Ebina ; Kazunori Takada ; Takayoshi Sasaki
• 刊名：Journal of Physical Chemistry C
• 出版年：2011
• 出版时间：May 5, 2011
• 年：2011
• 卷：115
• 期：17
• 页码：8555-8566
• 全文大小：1230K
• 年卷期：v.115,no.17(May 5, 2011)
• ISSN：1932-7455

文摘

Two-component colloidal nanosheets were prepared in Ti_0.91O₂鈭扢nO₂, Ca₂Nb₃O₁₀鈭扵i_0.91O₂, and Ca₂Nb₃O₁₀鈭扢nO₂ systems with various compositions, and were flocculated by adding K ions. X-ray powder diffraction patterns of the products showed remarkably broad reflections, and powder pattern simulation was conducted based on the matrix method for diffuse scattering from stacking disorder. An approach similar to that used for analyzing layered composite crystals with one-directional disorder was adopted for the obtained mixed-layer compounds. The structural characteristics of the restacked nanosheets in the three binary nanosheet systems were found to be dependent on the combined pairs. In the Ti_0.91O₂鈭扢nO₂ system, the one-dimensional solid-solution state appeared in the fairly wide composition ranges of x 鈮?0.3 and x 鈮?0.7 for xTi_0.91O₂鈭?1 鈭?x)MnO₂, and the one-dimensional two-phase stacking state appeared in the intermediate range of 0.3 < x < 0.7. In the Ca₂Nb₃O₁₀鈭扵i_0.91O₂ system, the one-dimensional solid-solution state appeared in the composition ranges x 鈮?0.2 and x 鈮?0.7 for xCa₂Nb₃O₁₀鈭?1 鈭?x)Ti_0.91O₂, and the one-dimensional two-phase coexistence state appeared in the intermediate range. In the Ca₂Nb₃O₁₀鈭扢nO₂ system, flocculation led to phase separation into individually restacked nanosheets, restacked K鈭扖a₂Nb₃O₁₀ and restacked K鈭扢nO₂, throughout the composition range from 0.9Nb鈭?.1Mn to 0.1Nb鈭?.9Mn. Similarities and differences in flocculation behavior in the three binary systems, Ti_0.91O₂鈭扢nO₂, Ca₂Nb₃O₁₀鈭扵i_0.91O₂, and Ca₂Nb₃O₁₀鈭扢nO₂, were examined.