Lithiummetaborat Chemische Eigenschaften,Einsatz,Produktion Methoden
R-Sätze Betriebsanweisung:
R20/21/22:Gesundheitsschädlich beim Einatmen,Verschlucken und Berührung mit der Haut.
R41:Gefahr ernster Augenschäden.
S-Sätze Betriebsanweisung:
S24/25:Berührung mit den Augen und der Haut vermeiden.
Chemische Eigenschaften
White powder
Verwenden
Lithium metaborate is used for flux.
synthetische
Lithium metaborate, LiBO2, may be prepared by fusing together either lithium hydroxide or lithium carbonate and boric acid in the proper stoichiometric ratio. Recrystallization from water at about room temperature yields lithium metaborate- octahydrate, LiBO2·8H2O. The octahydrate may be dried to yield a dihydrate, LiBO2-2H2O, or a half-hydrate, LiBO2·0.5H2O.
Allgemeine Beschreibung
Lithium metaborate (LiBO
2) is the lithium salt of boric acid. It can be synthesized by reacting orthoboric acid with lithium carbonate. Its crystals belong to the monoclinic crystal system having space group
P2
1/
c. Three polymorphic forms have been identified on ambient pressure devitrification of LiBO
2: α-, γ- and β′-LiBO
2.
Structure and conformation
Lithium metaborate has several crystal forms.
Below 100 °C, LiBO
2·8H
2O is firstly dehydrated to a lower hydrate LiBO
2·2H
2O
[1].
When the temperature is higher than 190°C, the dehydrated amorphous hydrate could crystallize into other poorly crystalline phases designated as LiBO
2·xH
2O (x=0.3/0.5)
[2].
An anhydrous monoclinic α-LiBO
2 could be obtained when the baking temperature reaches 600 °C. The α form consists of infinite chains of trigonal planar metaborate anions [BO2O
-]n.
At 950 °C, by applying 15 kbar of pressure to a LiCl flux containing α-LiBO
2, α-LiBO
2 could be converted to metastable γ-LiBO
2 crystals which were small, but of high quality
[3]. γ-LiBO
2 has tetragonal symmetry with lattice parameter a=4.1961 ?, c=6.5112 ?, space group I-42d and a density of 2.882 g/cm
3.
Lithiummetaborat Upstream-Materialien And Downstream Produkte
Upstream-Materialien
Downstream Produkte
