1902
DOI: 10.1002/cber.190203502215
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Zur Kenntniss des Terbiums

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Cited by 3 publications
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“…Excellent summaries of early work have been given by Urbain (401), who listed the elements in order of decreasing basicity as La, Di, Ce(III), Y, Gd, Sm, Tb, Ho, Er, Tm, Yb, Sc and particularly by Bohm (33), who gave the order as La, Pr, Nd, Gd, Sm, Y, Tb, Ho, Er, Tm, Yb, Sc, Ce(IV) and pointed out that while the order lanthanum, praseodymium, neodymium appeared definite, the remainder of the series was in doubt. These series were based upon such observations as the following: the precipitation of didymium before lanthanum (29); the precipitation of samarium before gadolinium (16, 24, 109); precipitation of the erbium earths, terbium, and yttrium in that order (170); the grouping of lanthanum, didymium, samarium, yttrium, and terbium in the more basic fractions with erbium, holmium, thulium, ytterbium, scandium, and cerium in the less basic ones upon ammonia precipitation (231); increase of basicity in the series ytterbium, erbium, holmium, terbium as shown by ammonia precipitation (261); precipitation of didymium in preference to lanthanum with magnesium oxide (310); precipitation of samarium before didymium with ammonia (90); precipitation of samarium, didymium, and lanthanum in that order with ammonia (94); concentration of yttrium in the more basic fractions in ammonia separations (107, 305); and precipitation in order of the colorless yttrium earths, terbium, erbium, samarium, neodymium, and praseodymium by ammonia (309).…”
Section: Establishment Of Relative Basicitiesmentioning
confidence: 99%
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“…Excellent summaries of early work have been given by Urbain (401), who listed the elements in order of decreasing basicity as La, Di, Ce(III), Y, Gd, Sm, Tb, Ho, Er, Tm, Yb, Sc and particularly by Bohm (33), who gave the order as La, Pr, Nd, Gd, Sm, Y, Tb, Ho, Er, Tm, Yb, Sc, Ce(IV) and pointed out that while the order lanthanum, praseodymium, neodymium appeared definite, the remainder of the series was in doubt. These series were based upon such observations as the following: the precipitation of didymium before lanthanum (29); the precipitation of samarium before gadolinium (16, 24, 109); precipitation of the erbium earths, terbium, and yttrium in that order (170); the grouping of lanthanum, didymium, samarium, yttrium, and terbium in the more basic fractions with erbium, holmium, thulium, ytterbium, scandium, and cerium in the less basic ones upon ammonia precipitation (231); increase of basicity in the series ytterbium, erbium, holmium, terbium as shown by ammonia precipitation (261); precipitation of didymium in preference to lanthanum with magnesium oxide (310); precipitation of samarium before didymium with ammonia (90); precipitation of samarium, didymium, and lanthanum in that order with ammonia (94); concentration of yttrium in the more basic fractions in ammonia separations (107, 305); and precipitation in order of the colorless yttrium earths, terbium, erbium, samarium, neodymium, and praseodymium by ammonia (309).…”
Section: Establishment Of Relative Basicitiesmentioning
confidence: 99%
“…Fractional precipitation with ammonia has long been a favorite procedure (32). Thus, it has been employed for the purification of lanthanum (46,52,82,83,84,88,135,143,370); for the separation of the cerium earths in general (89,105,106,109,339,340,342,397,437); for the separation of the yttrium earths in general (19,95,96,104,107,118,170,261,266,308,309,332,335,336,337,397,405); and for such specific separations as gadolinium from samarium (16,24,109, 155, 261), holmium from erbium (25,174,183), didymium from cerium (49), didymium from lanthanum (83,86,129,143,176), samarium from didymium (90, 102), yttrium earths from yttrium (107, 108, 118, 182, 397), other earths from erbium (168), dysprosium from terbium (193), terbium from gadolinium (291, 402), and praseodymium from lanthanum…”
Section: -Ammoniamentioning
confidence: 99%