Silicon Powder

Formula: Si

Form: Powder

Material: Silicon

CAS Number: 7440-21-3

Commodity: Metals

Hazard Pictogram: GHS02, GHS07

Silicon powder is widely used in scientific research and industrial applications, primarily in semiconductor manufacturing, energy storage systems, and materials science. Its high surface area and reactivity make it ideal for use in microelectronics, photovoltaic cell fabrication, and as an anode material in lithium-ion and solid-state batteries. Silicon powder's ability to form robust compounds enhances its suitability for creating advanced composites and thermal barrier coatings, providing improved durability and efficiency in high-temperature environments. Ongoing research continues to explore its potential to improve the performance, cycle life, and sustainability of energy storage technologies, as well as in the development of nano-structured materials for electronic components.

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Powder

Mean Particle Size		Nominal
Minimum Particle Size		Nominal
Maximum Particle Size		Nominal
Maximum Particle Size		Nominal
Particle Size D10		Nominal
Particle Size D50		Nominal
Particle Size D90		Nominal

Material Properties for Metals

Atomic Properties

Element	Value
Atomic number	14
Crystal structure	Diamond
Electronic structure	Ne 3s² 3p²
Valences shown	4
Atomic weight( amu )	28.0855
Thermal neutron absorption cross-section( Barns )	0.16
Photo-electric work function( eV )	4.2
Natural isotope distribution( Mass No./% )	30/ 3.10
Natural isotope distribution( Mass No./% )	29/ 4.67
Natural isotope distribution( Mass No./% )	28/ 92.23
Atomic radius - Goldschmidt( nm )	0.117
Ionisation potential( No./eV )	5/ 167
Ionisation potential( No./eV )	1/ 8.15
Ionisation potential( No./eV )	2/ 16.3
Ionisation potential( No./eV )	3/ 33.5
Ionisation potential( No./eV )	4/ 45.1
Ionisation potential( No./eV )	6/ 205

Mechanical Properties

Element	Value
Hardness - Mohs	7
Material condition	Polycrystalline
Poisson's ratio	0.42
Bulk modulus( GPa )	100
Tensile modulus( GPa )	113

Electrical Properties

Element	Value
Electrical resistivity( µOhmcm )	23 x 10¹⁰@20@20°C
Thermal emf against Pt (cold 0C - hot 100C)( mV )	-41.56

Physical Properties

Element	Value
Boiling point( C )	2355
Density( gcm⁻³ )	2.34@20°C

Thermal Properties

Element	Value
Melting point( C )	1410
Latent heat of evaporation( J g⁻¹ )	13700
Latent heat of fusion( J g⁻¹ )	1650
Specific heat( J K⁻¹ kg⁻¹ )	703@25°C
Thermal conductivity( W m⁻¹ K⁻¹ )	80-150@0-100°C
Coefficient of thermal expansion( x10⁻⁶ K⁻¹ )	4.7-7.6@0-100°C

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Silicon Powder

Health hazard/Hazardous to the ozone layer

Tolerances

Material Properties for Metals