Strontium oxide
Encyclopedia
Strontium oxide or strontia, SrO, is formed when strontium
reacts with oxygen
. Burning strontium in air results in a mixture of strontium oxide and strontium nitride
. It also forms from the decomposition of strontium carbonate
SrCO3. It is a strongly basic oxide.
picture tube glass is strontium oxide, which has been the major use of strontium since 1970. Color televisions and other devices containing color cathode ray tube
s sold in the United States are required by law to use strontium in the faceplate to block X-ray
emission (these X-ray emitting TV's are no longer in production). Lead oxide
can be used in the neck and funnel, but causes discoloration when used in the faceplate.
in a vacuum.
Strontium
Strontium is a chemical element with the symbol Sr and the atomic number 38. An alkaline earth metal, strontium is a soft silver-white or yellowish metallic element that is highly reactive chemically. The metal turns yellow when exposed to air. It occurs naturally in the minerals celestine and...
reacts with oxygen
Oxygen
Oxygen is the element with atomic number 8 and represented by the symbol O. Its name derives from the Greek roots ὀξύς and -γενής , because at the time of naming, it was mistakenly thought that all acids required oxygen in their composition...
. Burning strontium in air results in a mixture of strontium oxide and strontium nitride
Strontium nitride
Strontium nitride, Sr3N2, is produced by burning strontium metal in air or in nitrogen. Like other metal nitrides, it reacts with water to give strontium hydroxide and ammonia:...
. It also forms from the decomposition of strontium carbonate
Strontium carbonate
Strontium carbonate 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 :...
SrCO3. It is a strongly basic oxide.
Uses
About 8% by weight of televisionTelevision
Television is a telecommunication medium for transmitting and receiving moving images that can be monochrome or colored, with accompanying sound...
picture tube glass is strontium oxide, which has been the major use of strontium since 1970. Color televisions and other devices containing color cathode ray tube
Cathode ray tube
The cathode ray tube is a vacuum tube containing an electron gun and a fluorescent screen used to view images. It has a means to accelerate and deflect the electron beam onto the fluorescent screen to create the images. The image may represent electrical waveforms , pictures , radar targets and...
s sold in the United States are required by law to use strontium in the faceplate to block X-ray
X-ray
X-radiation is a form of electromagnetic radiation. X-rays have a wavelength in the range of 0.01 to 10 nanometers, corresponding to frequencies in the range 30 petahertz to 30 exahertz and energies in the range 120 eV to 120 keV. They are shorter in wavelength than UV rays and longer than gamma...
emission (these X-ray emitting TV's are no longer in production). Lead oxide
Lead oxide
Lead oxide may refer to:* Lead oxide, PbO, litharge, massicot* Lead oxide, Pb3O4, minium, red lead* Lead dioxide , PbO2Less common lead oxides are:* Lead oxide, Pb2O3, lead sesquioxide...
can be used in the neck and funnel, but causes discoloration when used in the faceplate.
Reactions
Elemental strontium is formed when strontium oxide is heated with aluminiumAluminium
Aluminium or aluminum is a silvery white member of the boron group of chemical elements. It has the symbol Al, and its atomic number is 13. It is not soluble in water under normal circumstances....
in a vacuum.