Synthesis of Single-Crystalline Alkaline-Earth Metal Manganites Nanoribbons via Cation Exchange

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• 作者：Xianke Zhang ; Zhibing Xu ; Shaolong Tang ; Yu Deng ; Youwei Du
• 刊名：Crystal Growth & Design
• 出版年：2011
• 出版时间：July 6, 2011
• 年：2011
• 卷：11
• 期：7
• 页码：2852-2857
• 全文大小：1004K
• 年卷期：v.11,no.7(July 6, 2011)
• ISSN：1528-7505

文摘

Single-crystalline alkaline-earth metal manganites CaMn₃O₆, SrMn₃O_6鈥?i>x and Ba₆Mn₂₄O₄₈ nanoribbons have been successfully synthesized by a facile ion-exchange approach based on molten-salt reaction between Na_0.44MnO₂ nanoribbons and CaCl₂, SrCl₂, and BaCl₂. All of these as-prepared nanoribbons are investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and high-resolution transmission electron microscopy (HRTEM). Taking the synthesis of single-crystalline SrMn₃O_6鈥?i>x nanoribbons as an example, we researched in detail the conversion process from Na_0.44MnO₂ nanoribbons to SrMn₃O_6鈥?i>x nanoribbons. Our results indicate that Na_0.44MnO₂ nanoribbons serve as the precursor template and the final products are obtained via ion-exchange reaction. Although there is a complete cation exchange, a change in stoichiometry, and a change in crystal structure, the morphology is nearly perfectly maintained. The synthetic method is thought to be a self-sacrificing templating route.