Metal ions occupancies of CFO@950 obtained from Rietveld refinement of the PXRD diffraction pattern.

Ion	Site	Frac	Uiso	GoF
Co(ii)Td	T d	0.09	2 × 10−4	1.51
Fe(iii)Td	T d	0.91	2 × 10−4
Co(ii)Oh	O h	0.46	2.1 × 10−3
Fe(iii)Oh	O h	0.54	2.1 × 10−3
O	32	1.00	1.2 × 10−2