In situ Synthesis of Mixed-Valent Manganese Oxide Nanocrystals:  An In situ Synchrotron X-ray Diffraction Study

In situ Synthesis of Mixed-Valent Manganese Oxide Nanocrystals:  An In situ Synchrotron X-ray Diffraction Study

Phase transformations of materials can be studied by in situ synchrotron X-ray diffraction. However, most reported in situ synchrotron XRD studies focus on solid state/gel systems by measuring phase/structure changes during application of pressure or heat. Phase transformations during material synth...

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Bibliographic Details
Published in:Journal of the American Chemical Society 2006-04, Vol.128 (14), p.4570-4571
Main Authors: Shen, Xiong-Fei, Ding, Yun-Shuang, Hanson, Jonathan C, Aindow, Mark, Suib, Steven L
Format: Article
Language:eng
Subjects:
CATALYSTS
CHEMISTRY
Condensed matter: structure, mechanical and thermal properties
Crystalline state (including molecular motions in solids)
Crystallographic aspects of phase transformations
pressure effects
DESIGN
Exact sciences and technology
HYDROTHERMAL SYNTHESIS
MANGANESE OXIDES
national synchrotron light source
NSLS
PARTICLE ACCELERATORS
PHASE TRANSFORMATIONS
Physics
Structure of solids and liquids
crystallography
SYNCHROTRONS
SYNTHESIS
X-RAY DIFFRACTION
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Summary:Phase transformations of materials can be studied by in situ synchrotron X-ray diffraction. However, most reported in situ synchrotron XRD studies focus on solid state/gel systems by measuring phase/structure changes during application of pressure or heat. Phase transformations during material synthesis and their applications, especially in wet chemistry processes with different media, have not drawn much attention. Here, using manganese oxides as examples, we report the successful characterization of phase transformations in in situ hydrothermal synthesis conditions by the in situ synchrotron XRD method using a quartz/sapphire capillary tube as the synthesis reactor. The results were used for better design of materials with controlled structures and properties. This method can be generally used for synthesis of manganese oxides as well as for in situ characterization of other material syntheses using hydrothermal, sol−gel, and other methods. In addition, catalytic processes in liquid−solid, gas−solid, and solid−solid systems can also be studied in such an in situ way so that catalytic mechanisms can be better understood and catalyst synthesis and catalytic processes can be optimized.
ISSN:0002-7863
1520-5126