YTTRIUM SULFATE OCTAHYDRATE Chemische Eigenschaften,Einsatz,Produktion Methoden
R-S?tze Betriebsanweisung:
R36/37/38:Reizt die Augen, die Atmungsorgane und die Haut.
S-S?tze Betriebsanweisung:
S26:Bei Berührung mit den Augen sofort gründlich mit Wasser abspülen und Arzt konsultieren.
S37/39:Bei der Arbeit geeignete Schutzhandschuhe und Schutzbrille/Gesichtsschutz tragen.
Beschreibung
Yttrium(III) sulfate octahydrate, with the chemical formula Y2(SO4)3-8H2O, consists of infinite layers parallel to (10\overline 1), with [Y(H2O)4(SO4)3/2] being the only repeating unit. The layers are connected to each other using only moderately strong hydrogen bonds. The trivalent yttrium cation is coordinated by eight O-atoms from four sulfate groups and four water molecules in a distorted square antitetrahedron [YO8]. It is of the same structural type as the rare earth sulfate octahydrate
[1].
Figure 1. View perpendicular to the (10
1) layer of the title compound, with
[Y(H
2
O)
4/1
(SO
4
(1))
3/3
(SO
4
(2))
1/2
] as the repeat unit. Key: [SO
4
] tetrahedra (yellow), [YO
8
] antiprisms (red), oxygen (blue) and hydrogen
(light grey) atoms.
Chemische Eigenschaften
Small, reddish-white, monosymmetric
crystals. D 2.558, loses 8H2O at 120C, decomposes
700C. Soluble in concentrated sulfuric acid; sparingly
soluble in water; insoluble in alkalies.
Physikalische Eigenschaften
Red monoclinic crystals; density 2.59 g/cm
3; loses all its water molecules at 120°C; decomposes at 700°C; sparingly soluble in water, less soluble in hot water; dissolves in concentrated sulfuric acid forming Y(HSO4)3; insoluble in alkalis; forms double salts with alkali sulfates.
Verwenden
Yttrium sulfate is used in making many yttrium salts.
synthetische
Yttrium sulfate is produced as an intermediate in recovering yttrium from monazite or xenotime (see Yttrium, Recovery). Rare earth sulfates are separated on a cation exchange resin bed. Yttrium fraction is purified by fractional crystallization. Alternatively, yttrium sulfate may be prepared by reacting yttrium oxide with sulfuric acid.
YTTRIUM SULFATE OCTAHYDRATE Upstream-Materialien And Downstream Produkte
Upstream-Materialien
Downstream Produkte
