Changes in the structure of birnessite during siderophore-promoted dissolution: A time-resolved synchrotron X-ray diffraction study

doi:10.1016/j.chemgeo.2017.11.003

Title: Changes in the structure of birnessite during siderophore-promoted dissolution: A time-resolved synchrotron X-ray diffraction study

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Authors:: Fischer, Timothy B.; Heaney, Peter J.; Post, Jeffrey E.

Publication Date:: Mon Jan 01 00:00:00 EST 2018

Research Org.:: Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)

Sponsoring Org.:: DOE - OTHERNSF

OSTI Identifier:: 1416569

Resource Type:: Journal Article

Resource Relation:: Journal Name: Chemical Geology; Journal Volume: 476; Journal Issue: C

Country of Publication:: United States

Language:: ENGLISH

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                    Fischer, Timothy B., Heaney, Peter J., and Post, Jeffrey E. Changes in the structure of birnessite during siderophore-promoted dissolution: A time-resolved synchrotron X-ray diffraction study.  United States: N. p., 2018. 
        Web.  doi:10.1016/j.chemgeo.2017.11.003.

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                    Fischer, Timothy B., Heaney, Peter J., & Post, Jeffrey E. Changes in the structure of birnessite during siderophore-promoted dissolution: A time-resolved synchrotron X-ray diffraction study.  United States.  doi:10.1016/j.chemgeo.2017.11.003.

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                    Fischer, Timothy B., Heaney, Peter J., and Post, Jeffrey E. Mon .  
        "Changes in the structure of birnessite during siderophore-promoted dissolution: A time-resolved synchrotron X-ray diffraction study".  United States.  
        doi:10.1016/j.chemgeo.2017.11.003.

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@article{osti_1416569,

  title        = {Changes in the structure of birnessite during siderophore-promoted dissolution: A time-resolved synchrotron X-ray diffraction study},

  author       = {Fischer, Timothy B. and Heaney, Peter J. and Post, Jeffrey E.},

  abstractNote = {},

  doi          = {10.1016/j.chemgeo.2017.11.003},

  journal      = {Chemical Geology},

  number       = C,

  volume       = 476,

  place        = {United States},

  year         = {Mon Jan 01 00:00:00 EST 2018},

  month        = {Mon Jan 01 00:00:00 EST 2018}

}

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DOI: 10.1016/j.chemgeo.2017.11.003

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Time-Resolved Structural Analysis of K- and Ba-Exchange Reactions in Synthetic Na-birnessite using Synchrotron X-ray Diffraction

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Time-resolved Rietveld refinements using synchrotron X-ray diffraction (XRD) have documented real-time changes in unit-cell parameters in response to cation substitution in synthetic Na-birnessite. Potassium- and Ba-birnessite, like Na-birnessite, were found to have triclinic symmetry. Rietveld analyses of the XRD patterns for K- and Ba-exchanged birnessite revealed decreases in the a, c, and {beta} unit-cell parameters, with a decrease of 1.7 and 0.5%, respectively, in unit-cell volume relative to Na-birnessite. Fourier electron difference syntheses revealed that the changes in the configuration of the interlayer species, and the charge, size, and hydration of the substituting cations, serve as the primary controls onmore »« less
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We have explored the exchange of Cs for interlayer Na in birnessite using several techniques, including transmission electron microscopy (TEM) and time-resolved synchrotron X-ray diffraction (XRD). Our goal was to test which of two possible exchange mechanisms is operative during the reaction: (1) diffusion of cations in and out of the interlayer or (2) dissolution of Na-birnessite and reprecipitation of Cs-birnessite. The appearance of distinct XRD peaks for Na- and Cs-rich phases in partially exchanged samples offered support for a simple diffusion model, but it was inconsistent with the compositional and crystallographic homogeneity of (Na,Cs)-birnessite platelets from core to rimmore »« less
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