CaO-MgCl2-H2O体系中一维碱式氯化镁的水热合成与表征

doi:10.3724/SP.J.1077.2010.00129

摘要/Abstract

摘要：

通过水热反应在CaO-MgCl₂-H₂O体系中合成了不同结构与形态特征的一维碱式氯化镁（MHCH）, 分析了MgCl₂浓度、CaO与MgCl2的摩尔比R及水热条件对产物的影响. 结果表明, 当MgCl₂浓度>3mol/L，且R<0.5时才能得到MHCH; MHCH的直径和径长比随MgCl₂浓度和R的增加而增大. MHCH的最佳制备条件为［MgCl₂］=4mol/L, R=0.05. MHCH的结构相与反应温度密切相关, 温度低于150℃时, 体系中的产物为相3（Mg₂(OH)₃ Cl·4H₂O）; 温度高于150℃时的产物为相9（Mg₁₀(OH)₁₈Cl₂·5H₂O）. 常温下体系中首先出现Mg₃(OH)₅Cl·3H₂O和相5（Mg₃(OH)₅Cl·4H₂O）, 经陈化后两者均转化为相3, 经160℃水热反应后相3转化为相9.

关键词: CaO-MgCl₂-H₂O体系, 碱式氯化镁, 一维, 水热, 纳米线

Abstract:

One-dimensional magnesium hydroxide chloride hydrate (MHCH) with different structures and morphologies was prepared in CaO-MgCl₂-H₂O system via a hydrothermal method. The effects of MgCl₂ concentration, molar ratio of CaO to MgCl₂ (R), and hydrothermal conditions on the structure and morphology of MHCH were investigated. It was found that MHCH could be prepared when the concentration of MgCl₂ was greater than 3mol/L and R was less than 0.5. Both the diameter and radius length ratio of MHCH increased with the MgCl₂ concentration and R, and the optimum conditions of preparing MHCH were ［MgCl₂］=4mol/L and R=0.05. The phases of MHCH was strongly depended on the reaction temperature, where phase 3 (Mg₂(OH)₃Cl·4H₂O) was stable below 150℃ and phase 9 (Mg₁₀(OH)₁₈Cl₂·5H₂O) was formed above 150℃. In this reaction system at room temperature,Mg₃(OH)₅Cl·3H₂O and phase 5 (Mg₃(OH)₅Cl·4H₂O) appeared firstly, they were both transformed to phase 3 after aged for 1 d. Phase 3 could be converted to phase 9 during hydrothermal treatment at 160℃.

中图分类号:

TB321

陈雪刚,吕双双,张路,叶瑛,程继鹏,殷苏杭. CaO-MgCl₂-H₂O体系中一维碱式氯化镁的水热合成与表征[J]. 无机材料学报, DOI: 10.3724/SP.J.1077.2010.00129.

CHEN Xue-Gang,Lv Shuang-Shuang,ZHANG Lu,YE Ying,CHENG Ji-Peng,YIN Su-Hang. Hydrothermal Synthesis and Characterization of One-dimensional Magnesium Hydroxide Chloride Hydrate in CaO-MgCl₂-H₂O System[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2010.00129.

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CaO-MgCl₂-H₂O体系中一维碱式氯化镁的水热合成与表征

Hydrothermal Synthesis and Characterization of One-dimensional Magnesium Hydroxide Chloride Hydrate in CaO-MgCl₂-H₂O System

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