Substructure and superstructure of four-layer Ca-exchanged birnessite

VA Drits, B Lanson, AI Gorshkov… - American …, 1998 - pubs.geoscienceworld.org
Abstract Synthetic Ca-exchanged birnessite (CaBi) was studied by X-ray and selected-area
electron diffraction (XRD, SAED). The substructure of CaBi may be described with a four …

Structure of H-exchanged hexagonal birnessite and its mechanism of formation from Na-rich monoclinic buserite at low pH

B Lanson, VA Drits, E Silvester… - American …, 2000 - pubs.geoscienceworld.org
The structural transformation of high pH Na-rich buserite (NaBu) to H-exchanged hexagonal
birnessite (HBi) at low pH was studied by simulation of experimental X-ray diffraction …

Birnessite polytype systematics and identification by powder X-ray diffraction

VA Drits, B Lanson, AC Gaillot - American mineralogist, 2007 - pubs.geoscienceworld.org
The polytypes of birnessite with a periodic stacking along the c* axis of one-, two-, and three-
layers are derived in terms of an anion close-packing formalism. Birnessite layers may be …

Structure of synthetic monoclinic Na-rich birnessite and hexagonal birnessite: I. Results from X-ray diffraction and selected-area electron diffraction

VA Drits, E Silvester, AI Gorshkov… - American …, 1997 - degruyter.com
Abstract Synthetic Na-rich birnessite (NaBi) and its low pH form, hexagonal birnessite (HBi),
were studied by X-ray and selected-area electron diffraction (XRD. SAED). SAED patterns …

Structure of synthetic monoclinic Na-rich birnessite and hexagonal birnessite: II. Results from chemical studies and EXAFS spectroscopy

E Silvester, A Manceau, VA Drits - American Mineralogist, 1997 - degruyter.com
Solution chemical techniques were used to study the conversion of synthetic Na-rich
buserite (NaBu) to hexagonal (H+-exchanged) birnessite (HBi) at low pH. The low-pH …

Crystal structure determinations of synthetic sodium, magnesium, and potassium birnessite using TEM and the Rietveld method

JE Post, DR Veblen - American Mineralogist, 1990 - pubs.geoscienceworld.org
The Rietveld method and electron diffraction have been used to determine, for the first time,
the crystal structures of the subcells of synthetic Na-, Mg-, and K-rich birnessite-like phases …

Structure of heavy-metal sorbed birnessite: Part 2. Results from electron diffraction

VA Drits, B Lanson… - American …, 2002 - pubs.geoscienceworld.org
Selected-area electron diffraction (SAED) and energy-dispersive analysis were used to
study the structure of synthetic heavy-metal sorbed birnessites (MeBi). Samples were …

Structure of synthetic Na-birnessite: Evidence for a triclinic one-layer unit cell

B Lanson, VA Drits, Q Feng… - American …, 2002 - pubs.geoscienceworld.org
The structure of a synthetic analogue of Na-birnessite (NaBi) was studied by powder X-ray
diffraction (XRD). It is shown that NaBi has a one-layer triclinic structure with sub-cell …

Structure of heavy-metal sorbed birnessite: Part 1. Results from X-ray diffraction

B Lanson, VA Drits, AC Gaillot… - American …, 2002 - pubs.geoscienceworld.org
The structure of heavy-metal sorbed synthetic birnessites (MeBi) was studied by powder X-
ray diffraction (XRD) using a trial-and-error fitting procedure to improve our understanding of …

Cs-exchange in birnessite: Reaction mechanisms inferred from time-resolved X-ray diffraction and transmission electron microscopy

CL Lopano, PJ Heaney, JE Post - American Mineralogist, 2009 - pubs.geoscienceworld.org
We have explored the exchange of Cs for interlayer Na in birnessite using several
techniques, including transmission electron microscopy (TEM) and time-resolved …