Strontium fluoride Property

Melting point:

>1400 °C (lit.)

Boiling point:

2489 °C (lit.)

Density 

4.24 g/mL at 25 °C (lit.)

refractive index 

1.442

solubility 

soluble in dilute acid solutions

form 

powder

color 

White

Specific Gravity

4.24

Odor

odorless

Water Solubility 

11.7 mg/100 mL (18 ºC)

Crystal Structure

CaF2 type

crystal system

Cube

Merck 

14,8842

Solubility Product Constant (Ksp)

pKsp: 8.36

Space group

Fm3m

Lattice constant

a/nm	b/nm	c/nm	α/o	β/o	γ/o	V/nm3
0.58	0.58	0.58	90	90	90	0.1947

Dielectric constant

6.4699999999999998

Exposure limits

ACGIH: TWA 2.5 mg/m3
NIOSH: IDLH 250 mg/m3; TWA 2.5 mg/m3

Stability:

hygroscopic

CAS DataBase Reference

7783-48-4(CAS DataBase Reference)

NIST Chemistry Reference

Strontium fluoride(7783-48-4)

EPA Substance Registry System

Strontium fluoride (SrF2) (7783-48-4)

Safety

Hazard Codes 

Xi

Risk Statements 

36/37/38

Safety Statements 

26-36

RIDADR 

UN3288

WGK Germany 

2

RTECS 

WK8925000

Hazard Note 

Irritant

TSCA 

Yes

HazardClass 

6.1

PackingGroup 

III

HS Code 

2826199090

Hazard and Precautionary Statements (GHS)

Symbol(GHS)

Signal word

Warning

Hazard statements

H315Causes skin irritation

H319Causes serious eye irritation

H335May cause respiratory irritation

Precautionary statements

P261Avoid breathing dust/fume/gas/mist/vapours/spray.

P304+P340IF INHALED: Remove victim to fresh air and Keep at rest in a position comfortable for breathing.

P305+P351+P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continuerinsing.

P405Store locked up.

Strontium fluoride Chemical Properties,Usage,Production

Crystal System

The space lattice of SrF2 belongs to the cubic system, and its calcium fluoride structure has a lattice constant of a=0.5781 nm and Sr–F=0.2504 nm. The cleavage plane is (111)—that is, octahedron is formed by the cleavage.

Chemical Properties

White powder. Soluble in hydrochloric acid and hydrogen fluoride; insoluble in water.

Chemical Properties

Strontium fluoride, also called strontium difluoride and strontium(II) fluoride, is a fluoride of strontium. It is a stable brittle white crystalline solid. It forms face-centered cubic crystals, with structure of calcium fluoride. It is almost insoluble in water. Strontium fluoride is prepared by reaction of strontium chloride with fluorine gas, by action of hydrofluoric acid on strontium carbonate, or by addition of potassium chloride to strontium chloride solution. It irritates eyes and skin, and is harmful when inhaled or ingested.

Physical properties

Strontium fluoride, SrF2, also called "strontium difluoride" and "strontium (II) fluoride", is a stable, brittle, white crystalline solid with a melting point of 1477°C and a boiling point of 2460°C. Its molecular weight is 125.62 g/mol. Its density is 4.24 g/cm3. Its melting point has also been given as 1463°C and a boiling point of 2489°C. It is virtually insoluble since its solubility in water is 0.00012 g/100 ml of water at 18°C.
SrF2 is almost insoluble in water (its KSP value is approximately 4.33×10⁹ at 25°C. It irritates eyes and skin, and is harmful when inhaled or ingested.

Uses

Strontium fluoride is used as an optical material transparent from vacuum ultraviolet (150 nm) to infrared (11 μm) for a small range of special applications. Its optical properties are intermediate to calcium fluoride and barium fluoride. It is also used as an optical coating on lenses.

Uses

Strontium fluoride is transparent to light in the wavelengths from the vacuum UV (150 nm) to the near IR (11 mm). Its optical properties are intermediate to CaF2 and BaF2. Strontium fluoride is used as an optical material for a small range of special applications, for example, as an optical coating on lenses and also as a thermoluminescent dosimeter crystal. Another use is as a carrier of the ⁹⁰Sr radioisotope in thermoelectric generators. SrF2 is also used as a single crystal for lasers.

Uses

Substitute for other fluorides, electronic and optical applications, single crystals for lasers, hightemperature dry-film lubricants.

Preparation

Strontium fluoride is synthesized by the fluorination of strontium dichloride, or by action of hydrofluoric acid on strontium carbonate:
SrCl2 (aq)＋ F2 (gas)→SrF2 (solid)＋ Cl2 (gas)
SrCO3＋ 2HF→SrF2＋ CO2＋H2O
Note that the first reaction depends upon the insolubility of SrF2 in water. Strontium fluoride is a water-insoluble source for use in oxygen-sensitive applications, such as metal production since it in nonhygroscopic.

Hazard

Toxic material.

Flammability and Explosibility

Not classified

Safety Profile

Moderately toxic by intravenous route. Mildly toxic by ingestion. When heated to decomposition it emits toxic fumes of F-. See also FLUORIDES and STRONTIUM COMPOUNDS.