Boron

Physical properties
Content created by REAL intelligence since 2016


Physical state @ 20°C: Solid [5]
Color: α-rhombohedral structure: Clear red crystals [7]
β-rhombohedral structure: Black [7]
α-tetragonal structure: Black, opaque with metallic luster [7]
Amorphous form: Black or dark brown [7]
Luminescence: -
Luster: -
Transparancy: -
Streak: -
Odor: Odorless [5]

Molecular weight (g/mol): 10.806 [15]
Melting point (°C): List of melting points 2092 [2]
Boiling point (°C): List of boiling points 4002 [2]
Density (g/cm3): Density list α-rhombohedral structure: 2.46 [7]
β-rhombohedral structure: 2.65 [7]
α-tetragonal structure: 2.31 [7]
Amorphous form: 2.350 [7]
Relative vapor density (g/cm3): -
Molar volume (cm3): -
Vapor pressure: -
Critical temperature (°C): -
Critical pressure (kPa): -

Elastic properties:
Young's modulus (GPa):
Rigidity modulus (GPa):
Bulk modulus (GPa):
Poisson ratio:
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-
Hardness:
Mineral hardness:
Brinell hardness (MN/m2):
Vicker hardness (MN/m2):
11 [2]
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-

Reflectivity (%): -
Refractive index: -
Velocity of sound (m/s): -
Surface tension: -

Solubility: Water: Insoluble (20 °C) [5]

Decomposition temperature: n/a
Flammability: -
Flash point: -
Auto ignition temperature: 700 °C [5]
flammability or explosive limits (% v/v):
Upper:
Lower:

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