Kinetics of the Thermally-Induced Structural Rearrangement of γ-MnO2

Wesley M. Dose; Neeraj Sharma; Nathan A. S. Webster

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Kinetics of the Thermally-Induced Structural Rearrangement of γ-MnO2

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This work presents a temperature-dependent and time-resolved X-ray and neutron diffraction study of the thermally induced structural rearrangement of γ-MnO2. Here, we study electrochemically prepared γ-MnO2, the manganese dioxide phase used in the majority of battery applications, which we find to be ~64 ramsdellite a = 4.4351(6) A, b = 9.486(2) A, c = 2.8128(7) A, and V = 118.33(3) A~3 and -36 pyrolusite a = 4.718(3) A, c = 2.795(2) A, and V = 62.22(8) A~3. Taking a deeper look at the kinetics of the structural rearrangement, we find two steps: a fast transition occurring within 4—8 min with a temperature-dependent ramsdellite to pyrolusite transformation (rate constant 0.11-0.74 min~(-1)) and a slow transition over 4 h that densifies (with changes in unit cell and volume) the ramsdellite and pyrolusite phases to give structures that appear to be temperature-independent. '

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《The journal of physical chemistry, C. Nanomaterials and interfaces》 |2014年第42期|24257-24265|共9页
作者
Wesley M. Dose; Neeraj Sharma; Nathan A. S. Webster;
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Discipline of Chemistry, University of Newcastle, Callaghan, NSW 2308, Australia;

School of Chemistry, University of New South Wales, Sydney, NSW 2052, Australia;

CSIRO Process Science and Engineering, Box 312, Clayton South, VIC 3169, Australia;

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正文语种英语
中图分类物理化学（理论化学）、化学物理学;
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Kinetics of the Thermally-Induced Structural Rearrangement of γ-MnO2

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