<italic>A</italic>-site ordered perovskite CaCu3Cu2Ir2O12−<italic>δ</italic> with square-planar and octahedral coordinated Cu ions

A-site ordered perovskite CaCu₃Cu₂Ir₂O_12−δ with square-planar and octahedral coordinated Cu ions

Zhao Qing^{1, 2}, Yin Yun-Yu², Dai Jian-Hong², Shen Xi², Hu Zhi-Wei³, Yang Jun-Ye², Wang Qing-Tao^{1, 4, †,}, Yu Ri-Cheng², Li Xiao-Dong⁵, Long You-Wen^{2, 6, ‡,}

Crystal structure of A-site ordered perovskite with space group Im-3. The A′-site transition metal forms a square-planar A′O₄ unit, whereas the B-site transition metal forms an octahedral coordinated BO₆ unit.