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Title: Structures of barite (001) and (210)-water interfaces.

Abstract

The structures of the barite (001) and (210) cleavage surfaces were measured in contact with deionized water at 25 {sup o}C. High resolution ({approx}1 {angstrom}) specular X-ray reflectivity and atomic force microscopy were used to probe the step structures of the cleaved surfaces and the atomic structures of the barite-water interfaces including the structures of water near the barite-water interfaces. The barite (001) and (210) cleavage surfaces are characterized by large (>2500 {angstrom}) domains separated by unit-cell steps (7.15 and 3.44 {angstrom} steps for the (001) and (210) surfaces, respectively). This observation was unanticipated for the (001) surface in which adjacent BaSO{sub 4} layers are displaced vertically by c/2 and symmetry related through a 2{sub 1} screw axis along (001). The atomic structures of the two cleavage surfaces derived by X-ray reflectivity reveal that near-surface sulfate groups exhibit significant ({approx}0.4 {angstrom}) structural displacements, while Ba surface ion displacements are significantly smaller ({approx}0.07 {angstrom}). Water adsorbs to the barite surfaces in a manner consistent, in both number and height, with the saturation of broken Ba-O bonds; no evidence was found for additional structuring of the fluid water near the surface.

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
943241
Report Number(s):
ANL/ER/JA-38560
Journal ID: ISSN 1089-5647; JPCBFK; TRN: US200916%%607
DOE Contract Number:  
DE-AC02-06CH11357
Resource Type:
Journal Article
Journal Name:
J. Phys. Chem. B
Additional Journal Information:
Journal Volume: 105; Journal Issue: 34 ; Aug. 30, 2001; Journal ID: ISSN 1089-5647
Country of Publication:
United States
Language:
ENGLISH
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; BARITE; WATER; INTERFACES; MORPHOLOGY; ADSORPTION

Citation Formats

Fenter, P, McBride, M T, Srajer, G, Sturchio, N C, Bosbach, D, LLNL,, Univ.of Illinois at Chicago, and Karlsruhe, Forschungszentrum. Structures of barite (001) and (210)-water interfaces.. United States: N. p., 2001. Web. doi:10.1021/jp0105600.
Fenter, P, McBride, M T, Srajer, G, Sturchio, N C, Bosbach, D, LLNL,, Univ.of Illinois at Chicago, & Karlsruhe, Forschungszentrum. Structures of barite (001) and (210)-water interfaces.. United States. https://doi.org/10.1021/jp0105600
Fenter, P, McBride, M T, Srajer, G, Sturchio, N C, Bosbach, D, LLNL,, Univ.of Illinois at Chicago, and Karlsruhe, Forschungszentrum. 2001. "Structures of barite (001) and (210)-water interfaces.". United States. https://doi.org/10.1021/jp0105600.
@article{osti_943241,
title = {Structures of barite (001) and (210)-water interfaces.},
author = {Fenter, P and McBride, M T and Srajer, G and Sturchio, N C and Bosbach, D and LLNL, and Univ.of Illinois at Chicago and Karlsruhe, Forschungszentrum},
abstractNote = {The structures of the barite (001) and (210) cleavage surfaces were measured in contact with deionized water at 25 {sup o}C. High resolution ({approx}1 {angstrom}) specular X-ray reflectivity and atomic force microscopy were used to probe the step structures of the cleaved surfaces and the atomic structures of the barite-water interfaces including the structures of water near the barite-water interfaces. The barite (001) and (210) cleavage surfaces are characterized by large (>2500 {angstrom}) domains separated by unit-cell steps (7.15 and 3.44 {angstrom} steps for the (001) and (210) surfaces, respectively). This observation was unanticipated for the (001) surface in which adjacent BaSO{sub 4} layers are displaced vertically by c/2 and symmetry related through a 2{sub 1} screw axis along (001). The atomic structures of the two cleavage surfaces derived by X-ray reflectivity reveal that near-surface sulfate groups exhibit significant ({approx}0.4 {angstrom}) structural displacements, while Ba surface ion displacements are significantly smaller ({approx}0.07 {angstrom}). Water adsorbs to the barite surfaces in a manner consistent, in both number and height, with the saturation of broken Ba-O bonds; no evidence was found for additional structuring of the fluid water near the surface.},
doi = {10.1021/jp0105600},
url = {https://www.osti.gov/biblio/943241}, journal = {J. Phys. Chem. B},
issn = {1089-5647},
number = 34 ; Aug. 30, 2001,
volume = 105,
place = {United States},
year = {Thu Aug 30 00:00:00 EDT 2001},
month = {Thu Aug 30 00:00:00 EDT 2001}
}