Experimental determination of the eutectic temperature in air of the CuO-TiO<sub>2</sub> pseudobinary system期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Experimental determination of the eutectic temperature in air of the CuO-TiO₂ pseudobinary system

Authors:	MA de la Rubia JJ ReinosaP Leret JJ RomeroJ de Frutos JF Fernández

Affiliation:	^a Electroceramic Departament, Instituto de Cerámica y Vidrio, CSIC, Kelsen 5, 28049 Madrid, Spain ^b POEMMA Group, ETSI Telecomunicación (UPM), Ciudad Universitaria s/n 28040 Madrid, Spain

Abstract:	Eutectic temperature and composition in the CuO-TiO₂ 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 (XTiO₂=25 mol%) than the one calculated in the literature. The reduction of Cu²⁺ to Cu⁺ takes places at about 1030 °C. The existence of Cu₂TiO₃ and Cu₃TiO₄ has been confirmed by XRD in the temperature range between 1045 and 1200 °C.

Keywords:	Powder-solid state reaction Firing TiO₂ Transition metal oxides Eutectic
本文献已被 ScienceDirect 等数据库收录！