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http://dx.doi.org/10.5012/jkcs.2004.48.1.046

Relationship between Structural Stability and Crystallinity in Layered Manganese Oxide  

Hwang, Seong-Ju (Department of Applied Chemistry, Center for Optoelectronic and Microwave Devices, College of Natural Sciences, Konkuk University Chungju Campus)
Publication Information
Journal of the Korean Chemical Society / v.48, no.1, 2004 , pp. 46-52 More about this Journal
Abstract
The effect of crystallinity on the structural stability of layered manganese oxide has been systematically investigated. While well-crystalline manganate was prepared by solid-state reaction-ion exchange method, nanocrystalline one was obtained by Chimie-Douce reaction at room temperature. According to micro-Raman and Mn K-edge X-ray absorption spectroscopic results, manganese ions in both the manganese oxides are stabilized in the octahedral sites of the layered lattice consisting of edge-shared MnO6 octahedra. The differential potential plot clarifies that the layered structure of nanocrystalline material is well maintained during electrochemical cycling, in contrast to the well-crystalline homologue. From the micro-Raman results, it was found that delithiation-relithiation process for well-crystalline material gives rise to the structural transition from layered to spinel-type structure. On the basis of the present experimental findings, it can be concluded that nanocrystalline nature plays an important role in enhancing the structural stability of layered manganese oxides.
Keywords
Crystallinity; Structural Stability; Nanocrystal; Differential Potential Plot; Structural Transition;
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