in hydrogen bromide aq. HBr; all operations under Ar; Tb2O3 dissolved in aq. HBr, NH4Br added, heated in vac. (ratio of heating 5°C/h) to 200°C, then with 12°C/h to 400°C to dryness; purifn. by distn. in a Ta vessel in high vac. (1E-5 mbar);
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Getsis, Anna; Mudring, Anja-Verena
Zeitschrift fur Anorganische und Allgemeine Chemie, 2010 , vol. 636, # 9-10 p. 1726 - 1734
Bourguel
Comptes Rendus Hebdomadaires des Seances de l'Academie des Sciences, 1927 , vol. 184, p. 1564
Annales de Chimie (Cachan, France), 1928 , vol. <10>9, p. 454