Tin Oxide SnO2 powder CAS 18282-10-5

Overview of tin oxide SnO2 powder:

Tin oxide is an inorganic substance with the chemical formula SnO2. It is a white, light yellow or light gray tetragonal, hexagonal or orthorhombic crystalline powder. The melting point is 1630°C and the boiling point is 1800°C. With a density of 6.95 g/mL at 25 °C [1], it is also an excellent transparent conductive material. It is the first transparent conductive material put into commercial use. In order to improve its conductivity and stability, it is often doped and used, such as SnO2: Sb, SnO2: F, etc.

Tin oxide exists in nature in the form of cassiterite. Cassiterite is generally reddish-brown, in the form of particles or blocks, and is mostly dispersed in granite. It is the main ore for refining tin. Tin oxide is stable to air and heat, insoluble in water, and hardly soluble in acid or alkali solutions, but it can be soluble in hot concentrated sulfuric acid, molten caustic alkali and potassium hydroxide, and slightly soluble in alkali metal carbonate solutions. Does not react with general chemical reagents and does not react with nitric acid. When heated with concentrated HCl, it slowly becomes chloride and dissolves. Under high temperature, it is reduced to metallic tin by the action of hydrogen. React with CO to get metallic tin and CO2, the reaction is reversible. Preparation method: tin is burned in the air, or tetravalent soluble tin salt reacts with alkali, or metal tin reacts with concentrated HNO3 to generate β-stannic acid precipitation, and then heated and dehydrated to obtain tin oxide.

SnO2 is also an excellent transparent conductive material. It is the first transparent conductive material put into commercial use. In order to improve its conductivity and stability, it is often doped and used, such as SnO2: Sb, SnO2: F, etc. Both SnO2 and its doping have a tetragonal rutile structure, as shown in Figure 1. Red is O, black is Sn, SnO2 is composed of two Sn and four O atoms, the lattice constant is a=b=0.4737nm, c=0.3186nm, c/a=0.637. O2-=0.140nm, Sn4+=0.071nm. SnO2 is an n-type wide band gap semiconductor with a band gap of 3.5-4.0eV, a visible light and infrared transmittance of 80%, a plasma edge at 3.2μm, a refractive index>2, and an extinction coefficient tending to 0. SnO2 has strong adhesion, The bonding force with glass and ceramics can reach 20MPa, the Mohs hardness is 7-8, the chemical stability is good, and it can withstand chemical etching. SnO2 acts as a conductive film, and its carriers mainly come from crystal defects, that is, electrons provided by O vacancies and doped impurities.

The properties of tin oxide SnO2 powder:Tin dioxide is produced by gasification method and acid method. Acidic SnO2 has a yellow appearance, gas SnO2 has a white appearance, a density of 7, and a melting point of 1127 degrees Celsius. Insoluble in water, dilute acid and alkali solution. Dissolved in concentrated sulfuric acid. It dissolves with alkali to form stannate. Used to make opaque glass, ceramic uranium and glass polishing agent. Cassiterite is naturally produced and can be made by burning tin in the air.

Application of tin oxide SnO2 powder:

What is the scope of application of tin oxide SnO2 powder?

Tin oxide is often used in enamel and electromagnetic materials, used in the manufacture of opalescent glass, tin salt, porcelain coloring agent, fabric mordant and weighting agent, steel and glass polishing agent, etc.

Tin oxide electrodes are widely used in optical glass and electrolytic aluminum industries at the smelting end of blast furnaces. Tin oxide electronic grade is especially suitable for the smelting of flint glass, barium flint, barium crown and heavy crown glass,etc.,and will not cause pollution to the glass.

Main applications of nano tin oxide:

1. Silver tin contact material. Silver tin oxide contact material is a new type of environmentally friendly electrical contact material that has developed rapidly in recent years. It is an ideal material to replace traditional silver cadmium oxide contacts.

2. Antistatic additives in plastics and construction industry

3. Transparent conductive material for flat panel and CRT (cathode ray tube) display

4. Electrical and electronic components

5. Tin oxide electrode for smelting special glass

6. Used for photocatalytic antibacterial materials

The price of tin oxide SnO2 powder:

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Suppliers of tin oxide SnO2 powder:

As a global supplier of tin oxide SnO2 powder, Tanki New Materials Co., Ltd. has extensive experience in the performance, application and cost-effective manufacturing of advanced technology and engineering materials. The company has successfully developed a series of powder materials (including oxides, carbides, nitrides, single metals, etc.), high-purity targets, functional ceramics and structural devices, and provides OEM services.