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A phase diagram for CaCuxMn7-xO12 for x⩽0.7 is presented. At room temperature CaCuxMn7-xO12 with x=0.10 and 0.20 crystallizes in the trigonal space group R3¯ and shows the same charge ordering of Mn3+ and Mn4+ ions as has been found for undoped CaMn7O12. The x=0.10 and 0.20 compounds both show an apical-type Jahn–Teller distortion of the MnO 6 octahedra around Mn3+ ions. Both compounds undergo...
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