slightly soluble in acids in water

-88.7 kJ/mol

3.1 (infrared);
3.55 (632.8 nm)

5400 cm²/(V·s) (300 K)

black cubic crystals

4.81 g/cm³, solid

1062°C

0.68 W/(cm·K) (300 K)

45.4 J/(mol·K)

59.8 J/(mol·K)

1.344 eV (300 K; direct)

Not listed

Toxic, hydrolysis to phosphine