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CM40_1103.pdf
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Nous avons étudié un monocristal de fluorapatite contenant 1,2(2)% Gd2O3 par poids (AP30–1), synthétisé à partir d’un bain fondu de CaF2 dans un récipient en platine, au moyen de la résonance paramagnétique des électrons (RPE) dans la bande W (~94 GHz) et par affinement de la structure par diffraction X. Le spectre RPE de AP30–1 indique un rapport de l’occupation des sites Ca par le Gd (Ca2Gd/Ca1Gd) de 1,4(4), et donc une légère différence en préférence entre les deux sortes de sites Ca. L’affinement de la structure de AP30–1 montre que le Gd serait réparti essentiellement également entre les deux sites : Ca2Gd/Ca1Gd = 0,8(2). Cette concordance entre la bande W du spectre RPE et les données sur la structure confirme que la spectroscopie RPE constitue un moyen révélateur pour déterminer la distribution des éléments traces paramagnétiques distribués sur des sites non-équivalents des minéraux.

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Nous avons étudié un monocristal de fluorapatite contenant 1,2(2)% Gd2O3 par poids (AP30–1), synthétisé à partir d’un bain fondu de CaF2 dans un récipient en...

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  • File Format: PDF
  • File Size: 176 KB
  • Pages: 10
  • Language: FR
  • Total Downloads: 185
  • Last Updated: 7 days ago

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