Chemical pressure-induced anion order–disorder transition in LnHO enabled by hydride size flexibility by Yamashita, H, Broux, T, Kobayashi, Y, Takeiri, F, Ubukata, H, Zhu, T, Hayward, MA, Fujii, K, Yashima, M, Shitara, K, Kuwabara, A, Murakami, T, Kageyama, H