Abstract
In this paper, the first successful growth of CuFeO 2 single crystals by applying the traveling solvent floating-zone technique is reported. Typical crystals of 5–8 mm in diameter and 10–30 mm in length have been obtained from the starting materials Cu 2O and Fe 2O 3 with the molar ratio 1:1. The as-grown crystal is homogeneous and of the trigonal system with cell parameters a h = 3.04Å and c h = 17.17Å in the hexagonal description. In Mössbauer effect (ME) measurements, the isomer shift for 57Fe in CuFeO 2 at room temperature is 0.40 mm/s with respect to metallic iron, which offers experimental confirmation that the iron is present in the trivalent state. Magnetic susceptibility measurements indicate that CuFeO 2 has two successive magnetic transition temperatures at T N = 13.5 K and T N = 9.5 K, respectively. Thermal analysis reveals that CuFeO 2 partially decomposes into Fe 2O 3 and Cu 2O at about 1180°C.
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