Citation: Wang, C.; Soga, H.; Yugi, T.; Sakai, M.; Okiba, T.; Hashimoto, T. (2019). Variation in crystal structure of Ln2Ni1-xCuxO4+delta (Ln: La, Pr, Nd, Sm, Eu, and their solid solution) based on type of Ln: Relationship between crystal structure and tolerance factor. Journal of the Ceramic Society of Japan, 127, pp. 678-687.