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We have synthesized compounds of Ca 3 Co 2−x Fe x O 6 (x=0–1.5) by sol–gel reaction method. X-ray diffraction data show that the solubility limit of Fe in the spin-chain compound Ca 3 Co 2 O 6 is about x=0.7. For the rhombohedral (R3¯c) samples with x≤0.7, the upward deviation from the paramagnetic Curie–Weiss law in the inverse magnetic susceptibility...