“…Other experimental work has found evidence for a possible isostructural phase transition at pressures below 10 GPa (Jing‐Geng et al., 2005). Computational work on TiN has been conducted up to higher pressures using ab initio techniques and density functional theory (Abavare et al., 2017; Ahuja et al., 1996; Dong et al., 2009; Field, 1984; Gubanov et al., 2005; Kroll, 2004; Lazar et al., 2007; Liu et al., 2012; Marlo & Milman, 2000; Srivastava et al., 2011; Wang et al., 2010; R. Yang et al., 2016; Y. Yang et al., 2009; Zhang & Veprek, 2008; Zhukov et al., 1988), finding evidence for a phase transition at pressures near 300 GPa. However, to our knowledge no studies have explored the behavior of TiN in situ at the high pressures ( P ) and simultaneous high temperatures ( T ) present in Earth's mantle.…”