Strontium bromide
Template:Use British English <templatestyles src="Chembox/styles.css"/>
Template:Chembox image cellTemplate:Chembox AllOtherNamesTemplate:Chembox headerbarTemplate:Chembox IndexlistTemplate:Chembox JmolTemplate:Chembox ChEMBLTemplate:Chembox ECHATemplate:Chembox E numberTemplate:Chembox IUPHAR ligandTemplate:Chembox UNIITemplate:Chembox CompToxTemplate:Chembox headerbarTemplate:Chembox SolubilityInWaterTemplate:Chembox headerbarTemplate:Chembox CrystalStructFormulasTemplate:Chembox headerbarTemplate:Chembox OHS (set)Template:Chembox headerbarTemplate:Chembox Datapage checkTemplate:Chembox FooterTemplate:Chembox Footer/trackingScript error: No such module "TemplatePar".Template:Short description
Strontium bromide is a chemical compound with a formula Template:Chem2. At room temperature it is a white, odourless, crystalline powder. Strontium bromide imparts a bright red colour in a flame test, showing the presence of strontium ions. It is used in flares and also has some pharmaceutical uses.
Preparation
Template:Chem2 can be prepared from strontium hydroxide and hydrobromic acid.
Alternatively strontium carbonate can also be used as strontium source.
These reactions give hexahydrate of strontium bromide (Template:Chem2), which decomposes to dihydrate (Template:Chem2) at 89 °C. At 180 °C anhydrous Template:Chem2 is obtained.[1]
Structure
At room temperature, strontium bromide adopts a crystal structure with a tetragonal unit cell and space group P4/n. This structure is referred to as α-Template:Chem2 and is isostructural with [[europium(II) bromide|Template:Chem2]] and [[uranium diselenide|Template:Chem2]]. The compound's structure was initially erroneously interpreted as being of the [[Lead(II) chloride|Template:Chem2]] type,[2] but this was later corrected.[3][4]
Around 920 K (650 °C), α-Template:Chem2 undergoes a first-order solid-solid phase transition to a much less ordered phase, β-Template:Chem2, which adopts the cubic fluorite structure. The beta phase of strontium bromide has a much higher ionic conductivity of about 1 S/cm, comparable to that of molten Template:Chem2, due to extensive disorder in the bromide sublattice.[4] Strontium bromide melts at 930 K (657 °C).
-
Distorted square antiprismatic coordination geometry of crystallographically independent strontium atom number 1
-
Square antiprismatic coordination geometry of strontium number 2
-
Flattened tetrahedral coordination geometry of bromine number 1
-
Distorted tetrahedral coordination geometry of bromine number 2
-
Tetrahedral coordination geometry of bromine number 3
-
Tetrahedral coordination geometry of bromine number 4
See also
References
<templatestyles src="Reflist/styles.css" />
- ↑ Dale L. Perry, Sidney L. Phillips: Handbook of Inorganic Compounds. CRC Press, 1995, Template:ISBN, (Strontium bromide, p. 387, at Google Books).
- ↑ Script error: No such module "Citation/CS1".
- ↑ Script error: No such module "Citation/CS1".
- ↑ a b Script error: No such module "Citation/CS1".
Script error: No such module "Check for unknown parameters".
Script error: No such module "Navbox". Template:Bromine compounds