TaThN3 can be prepared from a reaction of Ta2Th2O9 and Ca3N2 at 1100-1500 degrees C or from a reaction of Ta3N5 and Th3N4 at 1400 degrees C. This black polycrystalline material crystallizes in the perovskite structure type with a = 4.020(6) Angstrom. (C) 1995 Academic Press, Inc.