Layered Europium and Yttrium Hydroxychlorides: Thermal Decomposition and Rehydration

IF 1.8 3区 化学 Q3 CHEMISTRY, INORGANIC & NUCLEAR
M. A. Teplonogova, A. S. Kovalenko, A. D. Yapryntsev, N. P. Simonenko, A. A. Kozlova, A. E. Baranchikov, V. K. Ivanov
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引用次数: 0

Abstract

The dehydration–rehydration process of layered hydroxides is an example of a reversible chemical reaction involving rearrangement of the crystal structure. Products of thermal decomposition of layered rare earth hydroxides are known to react under certain conditions with aqueous salt solutions and restore their original layered structure. In the present work, the effect of the temperature and duration of thermal treatment of the layered rare earth hydroxychlorides at 100–1150°C on the reaction of the obtained products with aqueous sodium chloride solution was systematically studied for the first time. The main stages of the thermal decomposition of layered rare earth hydroxychlorides were determined by the thermogravimetric analysis. X-ray powder diffraction analysis and energy-dispersive X-ray spectroscopy were used to determine the phase and the chemical composition of the products of thermal treatment and subsequent rehydration of the layered hydroxides. It was shown that the presence of the rare earth oxychloride phase in the products of thermal decomposition was a critical factor for the recovery of the layered structure.

Abstract Image

层状铕和钇羟基氯化物:热分解和再水化
层状氢氧化物的脱水-再水合过程是涉及晶体结构重排的可逆化学反应的一个例子。层状稀土氢氧化物的热分解产物已知在一定条件下与含水盐溶液反应并恢复其原有的层状结构。本文首次系统研究了层状稀土羟基氯化物在100 ~ 1150℃的热处理温度和热处理时间对产物与氯化钠水溶液反应的影响。用热重分析法确定了层状稀土羟基氯化物热分解的主要阶段。采用x射线粉末衍射分析和能量色散x射线光谱法测定了层状氢氧化物热处理和复水化产物的物相和化学组成。结果表明,热分解产物中稀土氯氧相的存在是层状结构恢复的关键因素。
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来源期刊
Russian Journal of Inorganic Chemistry
Russian Journal of Inorganic Chemistry 化学-无机化学与核化学
CiteScore
3.10
自引率
38.10%
发文量
237
审稿时长
3 months
期刊介绍: Russian Journal of Inorganic Chemistry is a monthly periodical that covers the following topics of research: the synthesis and properties of inorganic compounds, coordination compounds, physicochemical analysis of inorganic systems, theoretical inorganic chemistry, physical methods of investigation, chemistry of solutions, inorganic materials, and nanomaterials.
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