Katashi Masumoto1 and Isao Nakatani1
1National Research Institute for Metals, Tokyo
CuCr2Se4 single crystals were grown by a chemical transport method. The single crystals obtained were crystallographically characterized by optical microscopy, Laue method and X-ray topographic techniques. The magnetic properties of these crystals have been measured. These results are summarized as follows.
(1) CuCr2Se4 single crystals, which were octahedral up to an edge length of about 3 mm, were grown by a chemical transport method from the CuCr2Se4 polycrystalline powder using iodine carrier under the condition of the feed end, 950°C, and that of the growth end, 800°C.
(2) The optimum temperature conditions of the chemical transport reactions using iodine carrier for the crystal perfection were determined to be 850 ∼ 900°C for the feed end 800°C for the growth end.
(3) The magnetic properties have been measured, using the single crystals obtained. The saturation magnetization was determined to be 270 emu/cc, and the magnetic anisotropy constant K1 was found to be -0.9×105 erg/cc at room temperature. The high-temperature susceptibility obeys the Curie-Weiss law. The paramagnetic Curie temperature θ and the Curie constant were determined to be 441°K and 2.55 emu ⋅ deg/mol, respectively. The ferromagnetic Curie temperature Tc was determined to be 430°K.
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