Three borides are known: UBr2 , UBr3 , and UBr4 . The most attention has been paid to the tetraboride, the properties of which are: melting point, >2,100 degrees C (but oxidizes rapidly above 600 degrees C); sp gr# = 9.38 g/mL; thermal expansion, 7.1 X 10-6 (20 to 1,000 degrees C); modulus of rupture (20 degrees C), 60,000 psi (414 MPa); electrical resistivity, 3 X 10-5 ohm.cm. Dodd
Source: Dictionary of Mining, Mineral, and Related Terms











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