Dome-like pressure-temperature phase diagram of the cooperative Jahn--Teller distortion in NaNiO${}_2$

Liam A. V. Nagle-Cocco, James M. A. Steele, Shiyu Deng +6

NaNiO${}_2$ is a Ni${}^{3+}$-containing layered material consisting of alternating triangular networks of Ni and Na cations, separated by octahedrally-coordinated O anions. At ambient…