Abstract
Eutectic temperature and composition in the CuO–TiO 2 pseudobinary system have been experimentally determined in air by means differential thermal analysis (DTA), thermogravimetry (TG) and hot-stage microscopy (HSM). Samples of the new eutectic composition treated at different temperatures have been characterized by X-ray diffraction (XRD) and X-ray absorption near-edge structural spectroscopy (XANES) to identify phases and to determine the Cu valence state, respectively. The results show that the eutectic temperature in air is higher by 100 °C (∼1000 °C) for a Ti-richer composition ( X TiO 2 = 25 mol % ) than the one calculated in the literature. The reduction of Cu 2+ to Cu + takes places at about 1030 °C. The existence of Cu 2TiO 3 and Cu 3TiO 4 has been confirmed by XRD in the temperature range between 1045 and 1200 °C.
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