Abstract
A-site-ordered quadruple perovskite CeCu3Cr4O12 was prepared by a high-pressure, high-temperature method at 7.7 GPa and about 1670 K. Its crystal structure was investigated using synchrotron X-ray powder diffraction between 100 and 590 K. In this temperature range, it crystallizes in the parent cubic structure for A-site-ordered quadruple perovskites with space group Im-3. It exhibits a ferrimagnetic transition at TC = 333 K. Very small changes of CuO and CrO bond lengths were found at TC, and no changes in CeO bond lengths. CeO bond lengths of CeCu3Cr4O12 (about 2.525 Å at 290 K) were very close to those of CeCu3Mn4O12 and CeCu3Fe4O12 suggesting the Ce4+ oxidation state and the charge distribution as Ce4+Cu2+3Cr3.5+4O12. No intersite charge transfer or charge disproportionation transitions were found in CeCu3Cr4O12.
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