Mn3+ and the pink color of gem-quality euclase from northeast Brazil

Autor: Lætitia Gilles-Guéry, Laurence Galoisy, Jurgen Schnellrath, Benoit Baptiste, Georges Calas

Publikováno v: American Mineralogist. 107:489-494

Pink euclase of gem quality and centimeter size, presenting an unusual pink-orange coloration and a pink to orange pleochroism, was discovered near Livramento de Nossa Senhora, in Bahia State, Brazil. The origin of the pink coloration has been invest

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::e6d0ac4b497578010e1c134499a569bd
https://doi.org/10.2138/am-2021-7838

Sodium nanoparticles in alkali halide minerals: Why is villiaumite red and halite blue?

Autor: Laurence Galoisy, Alexis Geisler, Georges Calas

Publikováno v: American Mineralogist
American Mineralogist, Mineralogical Society of America, 2021, 106 (5), pp.838-842. ⟨10.2138/am-2021-7917⟩
The American Mineralogist
The American Mineralogist, 2021, 106 (5), pp.838-842. ⟨10.2138/am-2021-7917⟩

The presence of metal Na nanoparticles causes the bright, thermally unstable colors of villiaumite (NaF) and halite (NaCl). These nanoparticles have been suspected for a long time to be caused by external irradiation. Metal nanoparticles, often refer

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b2a270d5608ff3a4e46198ad72d1baff
https://doi.org/10.2138/am-2021-7917

Niobium speciation in minerals revealed by L2,3-edges XANES spectroscopy

Autor: Quentin Bollaert, Mathieu Chassé, Hebatalla Elnaggar, Amélie Juhin, Alexandra Courtin, Laurence Galoisy, Cécile Quantin, Marius Retegan, Delphine Vantelon, Georges Calas

Publikováno v: The American Mineralogist
The American Mineralogist, 2022, 108 (3), pp.595-605. ⟨10.2138/am-2022-8293⟩

The systematic mineralogy of niobium (Nb) is complex, with more than one hundred species dominated by multicomponent oxides of similar chemistry. The determination of Nb speciation in solids (i.e., the distribution between the phases and the crystal-

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::5ce0e311a1ea4d8ff1cf7f1ba66d638c
https://hal.science/hal-03695880/file/bollaert_2021_ms_merged.pdf

Spectroscopic properties of alkali borate glasses containing Cu2+

Autor: Georges Calas, Natan Capobianco, Laurence Galoisy

Publikováno v: Journal of Non-Crystalline Solids. 591:121711

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::830900b528060573eb43d9661d92256b
https://doi.org/10.1016/j.jnoncrysol.2022.121711

Rôle structurel du titane sur les propriétés des scories

Autor: Georges Calas, Nicolas Trcera, Laurent Izoret, Domitille Le Cornec, Laurent Cormier, Laurence Galoisy

Publikováno v: Journal of the American Ceramic Society
Journal of the American Ceramic Society, 2021, 104 (1), pp.105-113. ⟨10.1111/jace.17407⟩
Journal of the American Ceramic Society, Wiley, 2021, 104 (1), pp.105-113. ⟨10.1111/jace.17407⟩

International audience; The presence of titanium in Ground Granulated Blast-furnace Slags (GGBS) has been suspected to modify cement properties. This study provides the first evidence of a relation between the TiO 2 content of slags and the mechanica

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::be002ab674ef9a4da57dd38ff4c597c9
https://hal.science/hal-03017679/document