Strontium carbonate

Strontium carbonate
IUPAC name Strontium carbonate
Other names Strontianite
Identifiers
CAS number	1633-05-2 Y
PubChem	15407
ChemSpider	14666 Y
UNII	41YPU4MMCA Y
RTECS number	WK8305000
Jmol-3D images	Image 1
SMILES [Sr+2].[O-]C([O-])=O
InChI InChI=1S/CH2O3.Sr/c2-1(3)4;/h(H2,2,3,4);/q;+2/p-2 Y Key: LEDMRZGFZIAGGB-UHFFFAOYSA-L Y InChI=1/CH2O3.Sr/c2-1(3)4;/h(H2,2,3,4);/q;+2/p-2 Key: LEDMRZGFZIAGGB-NUQVWONBAS
Properties
Molecular formula	SrCO3
Molar mass	147.63 g/mol
Appearance	White or grey powder hygroscopic
Odor	Odorless
Density	3.5 g/cm3
Melting point	1290 ºC decomp.
Solubility in water	0.0011 g/100 ml (18 ºC)
Refractive index (nD)	1.518
Hazards
MSDS	External MSDS data
EU Index	Not listed
NFPA 704	0 1 0
Flash point	Non-flammable
Related compounds
Other cations	Magnesium carbonate Calcium carbonate Barium carbonate
Y (verify) (what is: Y/N?) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

Strontium carbonate (SrCO₃) is the carbonate salt of strontium that has the appearance of a white or grey powder. It occurs in nature as the mineral strontianite.

Chemical properties

Strontium carbonate is a white, odorless, tasteless powder. Being a carbonate, it is a weak base and therefore is reactive with acids. It is otherwise stable and safe to work with. It is practically insoluble in water (1 part in 100,000). The solubility is increased significantly if the water is saturated with carbon dioxide, to 1 part in 1,000. It is soluble in dilute acids.

Preparation

Other than the natural occurrence as a mineral, strontium carbonate is prepared synthetically in one of two manners. First of which is from naturally occurring celestine also known as strontium sulfate (SrSO₄) or by using soluble strontium salts by the reaction in solution with a soluble carbonate salt (usually sodium or ammonium carbonates). For example if sodium carbonate was used in solution with strontium nitrate:

Sr(NO₃)_{2 (aq)} + Na₂CO_{3 (aq)} → SrCO_{3 (s)} + 2 NaNO_{3 (aq)}.

Uses

Nitric acid reacts with strontium carbonate to form strontium nitrate.

The most common use is as an inexpensive colorant in fireworks. Strontium and its salts emit a brilliant red color in flame. Unlike other strontium salts, the carbonate salt is generally preferred because of its cost and the fact that it is not hygroscopic. Its ability to neutralize acid is also very helpful in pyrotechnics. Another similar application is in road flares.

Strontium carbonate is used for electronic applications. It is used for manufacturing CTV to absorb electrons resulting from the cathode.

It is used in the preparation of iridescent glass, luminous paints, strontium oxide or strontium salts and in refining sugar.

It is widely used in the ceramics industry as an ingredient in glazes. It acts as a flux and also modifies the color of certain metallic oxides. It has some properties similar to barium carbonate.

It is also used in the manufacturing of strontium ferrites for permanent magnets which are used in loud speakers and door magnets.

Because of its status as a weak Lewis base, strontium carbonate can be used to produce many different strontium compounds by simple use of the corresponding acid.

External links

• [1] Reference page at CeramicMaterials.Info
• International Chemical Safety Card 1695