Li2CO3-Na2CO3-K2CO3/MgO非均相体系的物理化学性质

IF 1 4区化学 Q4 CHEMISTRY, MULTIDISCIPLINARY

Journal of The Serbian Chemical Society Pub Date : 2023-01-01 DOI:10.2298/jsc230201023z

I. Zakiryanova, E. Nikolaeva, I. Korzun

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引用次数: 0

摘要

研究了MgO浓度高达70 vol %的(Li2CO3-Na2CO3-K2CO3)熔体/MgO纳米粉非均相体系的结构、电导率、熔点和热熔效果。采用多种方法(DSC, XRD, BET，高分辨率扫描电镜，交流阻抗法，IR和拉曼光谱)对样品进行评价和研究。结果表明，当MgO颗粒间盐相层的有效厚度小于100 nm时，盐的熔点和非均相体系的归一化相变焓急剧下降。电导率的活化能随着MgO颗粒间熔相层有效厚度的减小而增大。研究表明，在400 ~ 600℃的温度下，MgO与碳酸盐熔体之间不存在化学相互作用。对(Li2CO3-Na2CO3-K2CO3)熔融体/MgO纳米粉体体系的原位拉曼光谱分析揭示了盐熔离子对固体颗粒的溶剂化作用。

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Physicochemical properties of the heterogeneous system Li2CO3-Na2CO3-K2CO3/MgO

The structure, conductivity, melting points and caloric melting effects of the (Li2CO3-Na2CO3-K2CO3)eut melt/MgO nanopowder heterogeneous system with MgO concentration up to 70 vol % have been investigated. A wide variety of methods (DSC, XRD, BET, high resolution scanning electron microscope, AC impedance method, IR and Raman spectroscopy) were used to evaluate samples and research. It is revealed that at the values of effective thickness of the salt phase interlayer between MgO particles below 100 nm there is an abrupt decrease in the melting points of the salt and the normalized phase transition enthalpy of the heterogeneous system. The activation energy of the electrical conductivity rises as the values of effective thickness of the melt phase interlayer between MgO particles decreases. The study established the lack of any chemical interaction between MgO and carbonate melt at 400-600??. In situ Raman spectroscopy of the (Li2CO3-Na2CO3-K2CO3)eut melt/MgO nanopowder systems revealed the solvation of solid particles by salt-melt ions.

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来源期刊

Journal of The Serbian Chemical Society 化学-化学综合

CiteScore

1.80

自引率

0.00%

发文量

审稿时长

1 months

期刊介绍： The Journal of the Serbian Chemical Society -JSCS (formerly Glasnik Hemijskog društva Beograd) publishes articles original papers that have not been published previously, from the fields of fundamental and applied chemistry: Theoretical Chemistry, Organic Chemistry, Biochemistry and Biotechnology, Food Chemistry, Technology and Engineering, Inorganic Chemistry, Polymers, Analytical Chemistry, Physical Chemistry, Spectroscopy, Electrochemistry, Thermodynamics, Chemical Engineering, Textile Engineering, Materials, Ceramics, Metallurgy, Geochemistry, Environmental Chemistry, History of and Education in Chemistry.