
1) Boron compound
Found on
https://www.crosswordclues.com/clue/nitridoborate

The nitridoborates are chemical compounds of boron and nitrogen with metals. These compounds are typically produced at high temperature by reacting hexagonal boron nitride (α -BN) with metal nitrides or by metathesis reactions involving nitridoborates. A wide range of these compounds have been made involving lithium, alkaline earth metals and lan...
Found on
http://en.wikipedia.org/wiki/Nitridoborate
No exact match found.