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Title: Atomic Structure of a Cesium Aluminosilicate Geopolymer: A Pair Distribution Function Study

Abstract

The atomic pair distribution function (PDF) method was used to study the structure of cesium aluminosilicate geopolymer. The geopolymer was prepared by reacting metakaolin with cesium silicate solution followed by curing at 50C for 24 h in a sealed container. Heating of Cs-geopolymer above 1000C resulted in formation of crystalline pollucite (CsAlSi{sub 2}O{sub 6}). PDF refinement of the pollucite phase formed displayed an excellent fit over the 10-30 {angstrom} range when compared with a cubic pollucite model. A poorer fit was attained from 1-10 {angstrom} due to an additional amorphous phase present in the heated geopolymer. On the basis of PDF analysis, unheated Cs-geopolymer displayed structural ordering similar to pollucite up to a length scale of 9 {angstrom}, despite some differences. Our results suggest that hydrated Cs{sup +} ions were an integral part of the Cs-geopolymer structure and that most of the water present was not associated with Al-OH or Si-OH bonds.

Authors:
; ; ; ; ; ; ;
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL) National Synchrotron Light Source
Sponsoring Org.:
Doe - Office Of Science
OSTI Identifier:
980032
Report Number(s):
BNL-92950-2010-JA
Journal ID: ISSN 0897-4756; CMATEX; TRN: US201015%%1417
DOE Contract Number:  
DE-AC02-98CH10886
Resource Type:
Journal Article
Journal Name:
Chemistry of Materials
Additional Journal Information:
Journal Volume: 20; Journal Issue: 14; Journal ID: ISSN 0897-4756
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; CESIUM; CESIUM SILICATES; CURING; DISTRIBUTION FUNCTIONS; HEATING; INTEGRALS; IONS; LENGTH; POLLUCITE; RANGE; SOLUTIONS; WATER; national synchrotron light source

Citation Formats

Bell, J., Sarin, P, Provis, J, Haggerty, R, Driemeyer, P, Chupas, P, van Deventer, J, and Kriven, W. Atomic Structure of a Cesium Aluminosilicate Geopolymer: A Pair Distribution Function Study. United States: N. p., 2008. Web. doi:10.1021/cm703369s.
Bell, J., Sarin, P, Provis, J, Haggerty, R, Driemeyer, P, Chupas, P, van Deventer, J, & Kriven, W. Atomic Structure of a Cesium Aluminosilicate Geopolymer: A Pair Distribution Function Study. United States. doi:10.1021/cm703369s.
Bell, J., Sarin, P, Provis, J, Haggerty, R, Driemeyer, P, Chupas, P, van Deventer, J, and Kriven, W. Tue . "Atomic Structure of a Cesium Aluminosilicate Geopolymer: A Pair Distribution Function Study". United States. doi:10.1021/cm703369s.
@article{osti_980032,
title = {Atomic Structure of a Cesium Aluminosilicate Geopolymer: A Pair Distribution Function Study},
author = {Bell, J. and Sarin, P and Provis, J and Haggerty, R and Driemeyer, P and Chupas, P and van Deventer, J and Kriven, W},
abstractNote = {The atomic pair distribution function (PDF) method was used to study the structure of cesium aluminosilicate geopolymer. The geopolymer was prepared by reacting metakaolin with cesium silicate solution followed by curing at 50C for 24 h in a sealed container. Heating of Cs-geopolymer above 1000C resulted in formation of crystalline pollucite (CsAlSi{sub 2}O{sub 6}). PDF refinement of the pollucite phase formed displayed an excellent fit over the 10-30 {angstrom} range when compared with a cubic pollucite model. A poorer fit was attained from 1-10 {angstrom} due to an additional amorphous phase present in the heated geopolymer. On the basis of PDF analysis, unheated Cs-geopolymer displayed structural ordering similar to pollucite up to a length scale of 9 {angstrom}, despite some differences. Our results suggest that hydrated Cs{sup +} ions were an integral part of the Cs-geopolymer structure and that most of the water present was not associated with Al-OH or Si-OH bonds.},
doi = {10.1021/cm703369s},
journal = {Chemistry of Materials},
issn = {0897-4756},
number = 14,
volume = 20,
place = {United States},
year = {2008},
month = {1}
}