Bariumfluorid

Bezeichnung:Bariumfluorid

CAS-Nr7787-32-8

Englisch Name:Barium fluoride

CBNumberCB6173780

SummenformelBaF2

Molgewicht175.32

MOL-Datei7787-32-8.mol

Synonyma

Bariumfluorid

Bariumfluorid physikalisch-chemischer Eigenschaften

Schmelzpunkt	1354 °C
Siedepunkt	2260 °C(lit.)
Dichte	4.89 g/mL at 25 °C(lit.)
Dampfdruck	0Pa at 20℃
Brechungsindex	1.4741
Flammpunkt	2260°C
storage temp.	Store at +5°C to +30°C.
Löslichkeit	1.2g/l
Aggregatzustand	random crystals
Farbe	White
Wichte	4.89
Wasserlöslichkeit	1.6 g/L (20 ºC)
Sensitive	Hygroscopic
Merck	14,974
Solubility Product Constant (Ksp)	pKsp: 6.74
Expositionsgrenzwerte	ACGIH: TWA 2.5 mg/m3 NIOSH: IDLH 250 mg/m3; TWA 2.5 mg/m3
Dielectric constant	7.3600000000000003
Stabilität	Stable. Incompatible with acids.
InChIKey	OYLGJCQECKOTOL-UHFFFAOYSA-L
CAS Datenbank	7787-32-8(CAS DataBase Reference)
NIST chemische Informationen	Barium fluoride(7787-32-8)
EPA chemische Informationen	Barium fluoride (BaF2) (7787-32-8)

Sicherheit

Kennzeichnung gefährlicher	Xn,T
R-Sätze:	20/22
S-Sätze:	28-28A
RIDADR	UN 2811 6.1/PG 3
WGK Germany	1
RTECS-Nr.	CQ9100000
Hazard Note	Toxic
TSCA	Yes
HazardClass	6.1
PackingGroup	III
HS Code	28261990
Toxizität	LD50 orally in Rabbit: 250 mg/kg

Gefahreninformationscode (GHS)

Barium fluoride Chemische Eigenschaften,Einsatz,Produktion Methoden

R-Sätze Betriebsanweisung:
R20/22:Gesundheitsschädlich beim Einatmen und Verschlucken.
S-Sätze Betriebsanweisung:
S28:Bei Berührung mit der Haut sofort abwaschen mit viel . . . (vom Hersteller anzugeben).
Beschreibung
Barium fluoride appears as colourless, odourless crystals/white powder and is slightly soluble in water but soluble in ethanol and methanol. When heated, barium fluoride decomposes and emits toxic fumes of fluorine and barium. Barium fluoride is used as a preopacifying agent and in enamel and glazing frits production. Its other use is in the production of welding agents (an additive to some fluxes, a component of coatings for welding rods and in welding powders). It is also used in metallurgy as a molten bath for refining aluminium.
Chemische Eigenschaften
Barium fluoride, BaF2, is a white crystal or powder.Under the microscope crystals may be clear and colorless. Barium fluoride is used commercially in combination with other fluorides for arc welding (qv) electrode fluxes.
Physikalische Eigenschaften
Barium fluoride (BaF2), also known as barium(II) fluoride, is a solid which can also be a transparent crystal. Its molecular weight is 175.34 g/mol. It occurs in nature as the mineral “Frankdicksonite”. It occurs as a white powder with a melting point of 1290 and a boiling point of 2259°C. It is slightly soluble in water (0.159 at 0.0°C and 0.162 g/100 ml of water at 20°C). The solid generally assumes the fluorite structure, but when subjected to high pressure, changes to the PbCl2 structure. In the vapor phase, the BaF2 molecule is nonlinear with an F–Ba–F angle of approximately 108°C.
Verwenden
As a flux and opacifier in vitreous enamels; in the manufacture of carbon brushes for DC motors and generators; in heat-treating metals; in embalming; in glass manufacture.
Verwenden
Barium Fluoride is used in ceramic flux, carbon brushes for electrical equipment, glass making, in the manufacture of other fluorides, crystals for spectroscopy, electronics and dry-film lubricants. Barium Fluoride is used in spectroscopic components. Barium Fluoride is often suitable for applications in the passive IR band (8 to 14 ?m) and is often used as a viewport window for thermography.
Vorbereitung Methode
A single crystal of Barium fluoride is grown from the melt solution by the Kyropoulos method and the Stockbarger method.
Application
Barium fluoride is used as the transmission window in λ: 150 nm–10 mm and as the Reststrahlen filter in λ: 30–60 mm.
Flammability and Explosibility
Non flammable
Sicherheitsprofil
A poison by ingestion and intraperitoneal routes. Moderately toxic by subcutaneous route. An experimental teratogen. See also FLUORIDES and BARIUM COMPOUNDS (soluble). When heated to decomposition it emits toxic fumes of F-.
Solubility in water
Barium fluoride is soluble in water with the solubility of 0.17 g/100 g H₂O (10 ℃). It is also soluble in acid and ammonium chloride.
läuterung methode
Wash it well with distilled H2O and dry it in a vacuum. Its solubility in H2O is 1.6g (10o), 1.6g (20o) and 1.62g (30o) per L, and is soluble in mineral acids and aqueous NH4Cl. It may be stored in glass bottles. [Kwasnik in Handbook of Preparative Inorganic Chemistry (Ed. Brauer) Academic Press Vol I p 234 1963.]
Structure and conformation
The space lattice of Barium fluoride (BaF2) belongs to the cubic system, and its calcium fluoride structure has a lattice constant of a=0.6187 nm and Ba–F=0.268 nm.

Barium fluoride Upstream-Materialien And Downstream Produkte

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