Caractérisation par résonance paramagnétique électronique (RPE) de quartz naturels issus de différentes sources

Mathieu Duttine (1) , Gérard Villeneuve (1) , Françoise Bechtel (1) , Gérard Demazeau (2)

1 IRAMAT - Institut de Recherches sur les Archéomatériaux
2 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux

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.

Keywords: EPR; Natural quartz; Characterisation; Paramagnetic defects

Domains: Material chemistry

Mathieu Duttine, Gérard Villeneuve, Françoise Bechtel, Gérard Demazeau. Caractérisation par résonance paramagnétique électronique (RPE) de quartz naturels issus de différentes sources. Comptes Rendus Géoscience, 2002, 334 (13), pp.949-955. ⟨10.1016/S1631-0713(02)01845-X⟩. ⟨hal-00817717⟩