Citation: Spektor, Kristina; Crichton, Wilson A.; Filippov, Stanislav; Klarbring, Johan; Simak, Sergei I.; Fischer, Andreas; H\"aussermann, Ulrich (2020). Na-Ni-H Phase Formation at High Pressures and High Temperatures: Hydrido Complexes [NiH5]3-Versus the Perovskite NaNiH3.. ACS omega, 5, pp. 8730-8743.