Barium fluoride

Barium fluoride
Identifiers
CAS Number	7787-32-8 ;
3D model (JSmol)	Interactive image; Interactive image;
ChemSpider	56421 ;
ECHA InfoCard	100.029.189
PubChem CID	62670;
RTECS number	CQ9100000;
UNII	H96A02I53Y ;
CompTox Dashboard (EPA)	DTXSID4064848 ;
	InChI InChI=1S/Ba.2FH/h;2*1H/q+2;;/p-2 Key: OYLGJCQECKOTOL-UHFFFAOYSA-L ;
	SMILES F[Ba]F; [Ba+2].[F-].[F-];
Properties
Chemical formula	BaF2
Molar mass	175.324 g/mol
Appearance	white cubic crystals
Density	4.893 g/cm3
Melting point	1,368 °C (2,494 °F; 1,641 K)
Boiling point	2,260 °C (4,100 °F; 2,530 K)
Solubility in water	1.58 g/L (10 °C); 1.61 g/L (25 °C)
Solubility product (Ksp)	1.84·10−7
Solubility	soluble in methanol, ethanol
Magnetic susceptibility (χ)	−51·10−6 cm3/mol
Thermal conductivity	10.9 W/(m·K)
Refractive index (nD)	1.557 (200 nm); 1.4744 (589 nm); 1.4014 (10 µm);
Structure
Crystal structure	Fluorite (cubic), cF12
Space group	Fm3m, No. 225
Lattice constant	a = 0.62 nm
Formula units (Z)	4
Thermochemistry
Heat capacity (C)	71.2 J/(mol·K)
Std molar; entropy (S⦵298)	96.4 J/(mol·K)
Std enthalpy of; formation (ΔfH⦵298)	−1207.1 kJ/mol
Gibbs free energy (ΔfG⦵)	−1156.8 kJ/mol
Hazards
	Occupational safety and health (OHS/OSH):
Main hazards	Toxic
	GHS labelling:
Pictograms
Flash point	Non-flammable
	Lethal dose or concentration (LD, LC):
LD50 (median dose)	250 mg/kg, oral (rat)
Safety data sheet (SDS)	PubChem
Related compounds
Other anions	Barium chloride; Barium bromide; Barium iodide;
Other cations	Beryllium fluoride; Magnesium fluoride; Calcium fluoride; Strontium fluoride; Radium fluoride;
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Barium fluoride is an inorganic compound with the formula Ba F₂. It is a colorless solid that occurs in nature as the rare mineral frankdicksonite. Under standard conditions it adopts the fluorite structure and at high pressure the PbCl₂ structure. Like CaF₂, it is resilient to and insoluble in water.

Above ca. 500 °C, BaF₂ is corroded by moisture, but in dry environments it can be used up to 800 °C. Prolonged exposure to moisture degrades transmission in the vacuum UV range. It is less resistant to water than calcium fluoride, but it is the most resistant of all the optical fluorides to high-energy radiation, though its far ultraviolet transmittance is lower than that of the other fluorides. It is quite hard, very sensitive to thermal shock and fractures quite easily.

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