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Effect of layer structure boundary on the hectorite basal diffraction

Published online by Cambridge University Press:  01 March 2012

Il Mo Kang ,
Myung Hun Kim ,
Youn Joong Kim ,
Hi-Soo Moon  and
Yungoo Song
Il Mo Kang*
Affiliation:
Department of Earth System Sciences, Yonsei University, 134, Shinchon-dong, Seodaemun-ku, Seoul, 120-749, Korea
Myung Hun Kim
Affiliation:
Department of Chemistry, Yonsei University, 134, Shinchon-dong, Seodaemun-ku, Seoul, 120-749, Korea
Youn Joong Kim
Affiliation:
Division of Nano-Material and Environmental Science, Korea Basic Science Institute, Taejon, 305-333, Korea
Hi-Soo Moon
Affiliation:
Department of Earth System Sciences, Yonsei University, 134, Shinchon-dong, Seodaemun-ku, Seoul, 120-749, Korea
Yungoo Song
Affiliation:
Department of Earth System Sciences, Yonsei University, 134, Shinchon-dong, Seodaemun-ku, Seoul, 120-749, Korea
*
a)Electronic mail: claykang@yahoo.co.kr
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Abstract

This study examined basal peak irrationalities according to boundary conditions of the hectorite basal diffraction unit (BDU), which were recognized as the total assembly of 2:1 phyllosilicate layer plus interlayer material. The hectorite basal profiles were computer-simulated using the three kinds of BDU settings identified from the middle of octahedral sheets in the nearest neighbor (centrosymmetric model), the middle of interlayers in the nearest neighbor (centrosymmetric model), and a basal oxygen plane to the margin of interlayer in contact with the next phyllosilicate layer (non-centrosymmetric model). In the results of simulations, irrationality and asymmetry of the hectorite basal peaks relied straightforwardly on the BDU scattering modulations for the non-Bragg angles containing information on the synergic scattering events of phyllosilicate layer and interlayer material. Among the concerned BDU boundaries, the non-centrosymmetric model more effectively represented the real hectorite profile than the two previously reported centrosymmetric models.

Keywords

hectoritebasal diffractionphyllosilicateinterlayercentrosymmetry

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Type
Technical Articles
Information
Powder Diffraction , Volume 21 , Issue 1 , March 2006 , pp. 30 - 35
Copyright
Copyright © Cambridge University Press 2006

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