Assertion: boron | /r/HasProperty | reb
Facets:
Source sentences:
text: A wide array of rhenium borides have been investigated including Re 3 B, Re 7 B 3 , Re 2 B, ReB, Re 2 B 3 , Re 3 B 7 , Re 2 B 5 , ReB 3 and ReB 2 .