Lithiummetaborat

Bezeichnung:Lithiummetaborat

CAS-Nr13453-69-5

Englisch Name:LITHIUM METABORATE

CBNumberCB7208760

SummenformelBH2LiO2

Molgewicht51.76

MOL-Datei13453-69-5.mol

Synonyma

Lithiummetaborat

Lithiummetaborat physikalisch-chemischer Eigenschaften

Schmelzpunkt	845 °C (lit.)
Dichte	1,4 g/cm³
storage temp.	Store at +5°C to +30°C.
Löslichkeit	soluble in ethanol.
Aggregatzustand	Powder
Wichte	1.4
Farbe	White
Wasserlöslichkeit	Soluble in water(27.5g/L).
Sensitive	Hygroscopic
Expositionsgrenzwerte	ACGIH: TWA 2 mg/m3; STEL 6 mg/m3
Stabilität	Stable.
CAS Datenbank	13453-69-5(CAS DataBase Reference)
EPA chemische Informationen	Lithium metaborate (13453-69-5)

Sicherheit

R-Sätze:	20/21/22-41
S-Sätze:	24/25
WGK Germany	1
F	3
TSCA	Yes
HS Code	2840 20 90

Gefahreninformationscode (GHS)

LITHIUM METABORATE 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 commonly used as a fused compound or a component for an assay. It has been used for the analysis of wild rice for silicon, calcium, magnesium and potassium. Lithium metaborate was used to fuse with solid samples for decomposition.
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 (LiBO₂) 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 P2₁/c. Three polymorphic forms have been identified on ambient pressure devitrification of LiBO₂: α-, γ- and β′-LiBO₂.
Flammability and Explosibility
Not classified
Structure and conformation
Lithium metaborate has several crystal forms.
Below 100 °C, LiBO₂·8H₂O is firstly dehydrated to a lower hydrate LiBO₂·2H₂O ^[1].
When the temperature is higher than 190°C, the dehydrated amorphous hydrate could crystallize into other poorly crystalline phases designated as LiBO₂·xH₂O (x=0.3/0.5)^[2].
An anhydrous monoclinic α-LiBO₂ 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-LiBO₂ could be converted to metastable γ-LiBO₂ crystals which were small, but of high quality^[3]. γ-LiBO² has tetragonal symmetry with lattice parameter a=4.1961 ?, c=6.5112 ?, space group I-42d and a density of 2.882 g/cm³.
Einzelnachweise
[1] E.I.Kamitsos, A.P.Patsis, M.A.Karakassides, G.D.Chryssikos, Infrared reflectance spectra of lithium borate glasses, Journal of Non-Crystalline Solids, 1990, 126, 52-67.
[2] Li Lei, Duanwei He, Kai He, Jiaqian Qin, Shanmin Wang, Pressure-induced coordination changes in LiBO2, Journal of Solid State Chemistry, 2009, 182, 3041-3048.
[3] Colin D. McMillen, Henry G. Giesber, Joseph W. Kolis, The hydrothermal synthesis, growth, and optical properties of γ-LiBO2, Journal of Crystal Growth, 310, 2008, 299-305.

Lithiummetaborat Anbieter Lieferant Produzent Hersteller Vertrieb Händler.

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