Caractérisation par résonance paramagnétique électronique (RPE) de quartz naturels issus de différentes sources
Language
en
Article de revue
This item was published in
Comptes Rendus Géoscience. 2002, vol. 334, n° 13, p. 949-955
Elsevier
English Abstract
Natural quartz crystals coming from Madagascar, Angola, Brazil, and Spain were studied by EPR after β irradiation in order to characterise the paramagnetic centres due to impurities, and examine in which way their relative ...Read more >
Natural quartz crystals coming from Madagascar, Angola, Brazil, and Spain were studied by EPR after β irradiation in order to characterise the paramagnetic centres due to impurities, and examine in which way their relative proportion could constitute a useful criterion for origin researches. In all our samples, EPR experiments revealed germanium centres [GeO4/M+]° with M = Li or Na, aluminium ones [AlO4/h]° and two titanium centres ([TiO4/H+]° and [TiO4/M+]°) also appeared, except for samples coming from Spain. The comparison of the relative concentrations of paramagnetic species led us on to draw diagrams that allowed distinguishing the origins of the studied samples using only EPR spectra.Read less <
Keywords
EPR
Natural quartz
Characterisation
Paramagnetic defects
Origin
Hal imported