The scientists demonstrated this by investigating three new compounds of this materials class—a cerium-tantalum nitride (Ce 2 TaN 4) and praseodymium- and neodymium-rhenium nitrides (Ln 2 ReN 4 ...

Diamond, graphite, boron nitride joined that list, as did transition metals like molybdenum, tantalum, and rhenium. However, there were a few surprises—particularly a phase of tantalum nitride ...