Boron phosphide

Identifiers
CAS Number	20205-91-8 Y
3D model (JSmol)	Interactive image Interactive image
ECHA InfoCard	100.039.616
PubChem CID	88409
CompTox Dashboard (EPA)	DTXSID1066570
SMILES [B+3].[P-3] B#P
Properties
Chemical formula	BP
Molar mass	41.7855 g/mol
Appearance	maroon powder
Density	2.90 g/cm3
Melting point	1,100 °C (2,010 °F; 1,370 K) (decomposes)
Band gap	2.1 eV (indirect, 300 K)[1]
Thermal conductivity	4.6 W/(cm·K) (300 K)[2]
Refractive index (nD)	3.0 (0.63 µm)[1]
Structure
Crystal structure	Zinc blende
Space group	F43m
Coordination geometry	Tetrahedral
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Y verify (what is YN ?) Infobox references

Boron phosphide (BP) (also referred to as boron monophosphide, to distinguish it from boron subphosphide, B₁₂P₂) is a chemical compound of boron and phosphorus. It is a semiconductor.^[3]

History

Crystals of boron phosphide were synthesized by Henri Moissan as early as 1891.^[4]

Appearance

Pure BP is almost transparent, n-type crystals are orange-red whereas p-type ones are dark red.^[5]

Chemical properties

BP is not attacked by acids or boiling aqueous alkali water solutions. It is only attacked by molten alkalis.^[5]

Physical properties

BP is known to be chemically inert and exhibit very high thermal conductivity.^[2] Some properties of BP are listed below:

• lattice constant 0.45383 nm
• coefficient of thermal expansion 3.65×10⁻⁶ /°C (400 K)
• heat capacity C_P ~ 0.8 J/(g·K) (300 K)
• Debye temperature = 985 K
• Bulk modulus 152 GPa
• relatively high microhardness of 32 GPa (100 g load).
• electron and hole mobilities of a few hundred cm²/(V·s) (up to 500 for holes at 300 K)
• high thermal conductivity of ~ 460 W/(m·K) at room temperature^[2]