Electron spin resonance studies of halloysites.

Electron spin resonance studies of halloysites.

Absorption lines in the g approx 4 region of ESR spectra of three New Zealand halloysites were found to originate from similar paramagnetic centres to those in kaolinites. Resonances in the g approx 4 region were not common to all the halloysites, although the signal at g = 2.0 for the Matauri Bay h...

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Main Authors: N. Chaikum, R. M. Carr
Other Authors: Mahidol University
Format: Article
Published: 2018
Subjects:
Earth and Planetary Sciences
Online Access:https://repository.li.mahidol.ac.th/handle/123456789/15335
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spelling th-mahidol.153352018-06-14T16:01:39Z Electron spin resonance studies of halloysites. N. Chaikum R. M. Carr Mahidol University Earth and Planetary Sciences Absorption lines in the g approx 4 region of ESR spectra of three New Zealand halloysites were found to originate from similar paramagnetic centres to those in kaolinites. Resonances in the g approx 4 region were not common to all the halloysites, although the signal at g = 2.0 for the Matauri Bay halloysite is probably due to a trapped positive hole or trapped 018O - 2 ion. A 6- line resonance produced by Te Puke halloysite and removable by Na-saturation is attributed to exchangeable Mn on the clay surface. Low-T lines exhibited by all samples are due to V 4+ or VO 2+ replacing Al 3+ in the octahedral sheet. -D.J.M. 2018-06-14T09:01:39Z 2018-06-14T09:01:39Z 1987-01-01 Article Clay Minerals. Vol.22, No.3 (1987), 287-296 10.1180/claymin.1987.022.3.03 00098558 2-s2.0-0023479587 https://repository.li.mahidol.ac.th/handle/123456789/15335 Mahidol University SCOPUS https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=0023479587&origin=inward
institution Mahidol University
building Mahidol University Library
continent Asia
country Thailand
Thailand
content_provider Mahidol University Library
collection Mahidol University Institutional Repository
topic Earth and Planetary Sciences
spellingShingle Earth and Planetary Sciences
N. Chaikum
R. M. Carr
Electron spin resonance studies of halloysites.
description Absorption lines in the g approx 4 region of ESR spectra of three New Zealand halloysites were found to originate from similar paramagnetic centres to those in kaolinites. Resonances in the g approx 4 region were not common to all the halloysites, although the signal at g = 2.0 for the Matauri Bay halloysite is probably due to a trapped positive hole or trapped 018O - 2 ion. A 6- line resonance produced by Te Puke halloysite and removable by Na-saturation is attributed to exchangeable Mn on the clay surface. Low-T lines exhibited by all samples are due to V 4+ or VO 2+ replacing Al 3+ in the octahedral sheet. -D.J.M.
author2 Mahidol University
author_facet Mahidol University
N. Chaikum
R. M. Carr
format Article
author N. Chaikum
R. M. Carr
author_sort N. Chaikum
title Electron spin resonance studies of halloysites.
title_short Electron spin resonance studies of halloysites.
title_full Electron spin resonance studies of halloysites.
title_fullStr Electron spin resonance studies of halloysites.
title_full_unstemmed Electron spin resonance studies of halloysites.
title_sort electron spin resonance studies of halloysites.
publishDate 2018
url https://repository.li.mahidol.ac.th/handle/123456789/15335
_version_ 1763496807099269120

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