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Boron (₅B^10.811)
[7440-42-8]

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Elemental Form


Elemental boron, black or dark brown in color, is not found in nature in its pure form, but occurs as orthoboric acid or as borates. Boron's energy band gap of 1.50 to 1.56eV exceeds that of either silicon or germanium. It transmits portions of the infrared. While a good conductor of electricity at high temperatures, boron's conductivity drops significantly at room temperature.
Melting Point	2075°C	Boiling Point	2550°C
Density	2.34g/cm³	Specific Heat @ 25°C	0.309cal/g°C
Heat of Fusion	5.3k-cal/g-atom	Heat of Vaporization	128k-cal/g-atom
Atomic Volume	4.6W/D	First Ionization Energy	191K-cal/g-mole
Electronegativity	2.0Pauling's	Covalent Radius	0.82Angstroms
Mohs Hardness @ 20°C	9.3	Electrical Resistivity @ 20°C	4x10⁶µΩ-cm
Crystal Structure	Rhombohedral