“…The most published synthetic route for actinide mononitrides, including NpN, is carbothermic reduction. NpN (Suzuki et al, 1994;Ogawa and Handa, 1995), PuN (Yahata and Ouchi, 1975;Muromura, 1982;Takano et al, 2001), UN (Matthews et al, 1988;Hunt et al, 2014), ThN (Parkison et al, 2016), and mixed mononitrides (Greenhalgh and Weber, 1968;Arai et al, 1993b;Minato et al, 2003) are all reported via carbothermic reduction. The general reaction for carbothermic reduction is as follows:…”