Strontium oxide

Cubic

Sr, O

Ätzstrontian

Gray - white powder

Fixed

5.0 g · cm -3

2460 ° C

3200 ° C

1.3 hPa at 2068 ° C

Decomposition in water

1.8710

Risk

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Strontium oxide is the oxide of the alkaline earth metal is strontium. It is a gray - white powder, which is produced by oxidation of the highly reactive strontium.

Production and representation

Strontium can be determined from strontium carbonate, which is found in nature as the mineral strontianite, win. At 1268 ° C under normal atmospheric pressure, strontium carbonate to strontium oxide and carbon dioxide react:

Properties

Strontium oxide is crystallized in the sodium chloride structure. At high pressures of > 36 GPa a phase transition is observed in a cesium chloride structure. This is accompanied by a volume reduction of 13 %, the density of the crystal increases to over 7.1 g/cm3.

With water strontium oxide reacts with evolution of heat to strontium:

With the help of aluminum powder can be strontium strontium to reduce ( alumino ):

Use

Strontium oxide is used in the glass industry for the production of special glasses, the oxide is added to the glass of cathode ray tubes for the radiation reduction about. Strontium previously has been used in the manufacture of beet sugar ( Strontianverfahren ).