热重分析
差热分析
超导电性
热分解
反应机理
分解
无机化学
X射线晶体学
化学
热分析
衍射
粉末衍射
相(物质)
材料科学
物理化学
分析化学(期刊)
热的
结晶学
有机化学
催化作用
热力学
凝聚态物理
物理
光学
作者
R. F. Zhuang,Jun Qiu,Yuting Zhu
标识
DOI:10.1016/0022-4596(90)90122-e
摘要
X-ray diffraction-coupled thermogravimetric differential thermal analysis (TG-DTA) has been used to study the reaction mechanism in the preparation of YBaCuO superconducting material from the thermoreaction method of nitrates. It is shown that there are three compound phases (Y2O3, CuO, Ba(NO3)2) before decomposition of Ba(NO3)2 and a mutual chemical reaction immediately occurs as soon as Ba(NO3)2 decomposes. The superconducting phase begins to form at a temperature of about 650°C and the suitable treatment temperature is between 750 and 800°C, which is much lower than that of the preparation reaction from oxides and/or carbonates.
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