Abstract:

From alkaline solution we have obtained a dark reddish brown granular and easily filtering Tb(Ⅳ) oxide hydrate by catalytic oxidation with potassium persulfate as its oxidant and Ag⁺ as catalyst. We have made a study on the factors which influence oxidation (basity, temperature, heating time and the quantity of oxidant and catalyst). The formation of Tb(Ⅳ) in the compound has been confirmed through chemical analysis, magnetic susceptibility and its chemical properties. The infrared spectra of the Tb(Ⅳ) compound have also been studied. The absorption band with the highest absorption at 1380 cm^-1 has been observed. This absorption band differs from that of the Tb(Ⅲ) compound, the former is sharper than the latter, and with the increase of Tb(Ⅳ) in the compound the absorption band becomes even sharper. Therefore, this absorption band (1380 cm^-1) is considered to be characteristic of Tb(Ⅳ) oxide hydrate.