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What is Silicon Monoxide? ? Silicon monoxide The chemical formula for SiO is an inorganic substance. It is an amorphous black-brown powder that turns yellowish under normal temperatures and pressure. It has a melting and boiling point of 1802degC respectively. The density is 2,13g/cm3. It is very soluble in acid, but it can be dissolved in the mixture of hydrofluoric mixed with nitric. The resulting silicon tetrafluoride then produces white powder when heated. The silicon monoxide in air is not stable, and it will oxidize. When the silicon monoxide vapour is slowly vaporized, it will disproportionate (see disproportionation reactions) into silicon and silica dioxide.
Silicon monoxide preparation
1. After silicon dioxide has reacted with elemental silicon, rapid cooling is required to make silicon monoxide.
SiO2 + S – 2SiO.
2. Mix silicon dioxide with SiO2 of 99.5% with coal tar powder. The C/SiO2 molar mixing ratio is 2.0. Heat the mixture under reduced pressurized, at 1600°C, 1.013kPa.

Property and stability properties of silicon monoxide
Silicon monoxide The material is not stable. It will be oxidized into silicon dioxide in air and is only stable when temperatures are above 1200degC.
Avoid open flames and high temperatures. It is not soluble when mixed with hydrofluoric or nitric acid. Heat and electricity are well insulated by this material. It is oxidized in air and forms a silicon oxide film. In oxygen, it burns and then reacts with the water to produce hydrogen. In the warm alkaline solution, hydrogen is generated and silicate is dissolved.
Silicon monoxide use
A fine silicon monoxide can be used to synthesize fine ceramics due to its high activity. This includes silicon nitride or silicon carbide. Useful in the preparation optical glass and semiconductors.
As a protective layer, evaporate the material in a vacuum. Preparation semiconductor materials.

Silicomonoxide: precautions
If you come into contact with your eyes, immediately rinse them with lots of water. Then consult your doctor.
Wear protective clothing.
Eyes, skin, respiratory tract and eyes are irritated.
Most water bodies are only mildly affected by this substance. Do not allow large quantities of undiluted products to enter groundwater, waterways or sewage system.
Avoid light, open flames and high temperatures.
Place in a ventilated, dry and airtight place.
Inhalation – If the patient inhales, it is best to move them to fresh air.
Skin contact: Remove all contaminated clothing. Wash your skin with soap and warm water. Seek medical attention if you feel unwell.
Contact with eyes: separate the eyelids, and rinse them under running water or with normal saline. Seek medical attention immediately.
Rinse your mouth with water and avoid vomiting. Seek medical attention immediately.
Advice for protecting rescuers – Move the patient into a safe area. Consult with a doctor. The doctor should see this sheet of chemical safety information.

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