Sodalite: Spectroscopic and Thermochemical Investigations

IF 0.7 4区地球科学 Q4 GEOCHEMISTRY & GEOPHYSICS

Geochemistry International Pub Date : 2023-07-24 DOI:10.1134/S0016702923060046

Yu. D. Gritsenko, E. N. Eremina, M. F. Vigasina, S. V. Vyatkin, L. P. Ogorodova, V. V. Maltsev, L. V. Melchakova

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引用次数: 0

Abstract

Two sodalite samples (sample I is Na₈Al₆Si₆O₂₄Cl₂⋅0.4H₂O from the Kovdor alkaline ultramafic massif with carbonatites in the Murmansk region, Russia, and sample II is Na₈Al₆Si₆O₂₄Cl₂⋅0.2H₂O from the Bayan Kol nepheline syenite and miaskite massif in the Republic of Tyva) were studied by thermal and electron-microprobe analyses, powder X-ray diffraction, photoluminescence, and by IR, Raman, and ESR spectroscopy. Solution melt calorimetry was applied to determine the enthalpy of formation from elements for water-bearing sodalite samples: −13536 ± 10 (I) and −13503 ± 19 (II) kJ/mol. The enthalpy of formation of sodalite of the theoretical composition Na₈Al₆Si₆O₂₄Cl₂ was evaluated at Δ_fH⁰(298.15 K) = −13446 ± 11 kJ/mol. The data obtained on the enthalpy of formation of sodalite and literature data on its S⁰(298.15 K) were used to calculate the standard Gibbs energies of formation of anhydrous and of water-bearing sodalite.

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苏打石:光谱和热化学研究

采用热分析、电子探针分析、粉末x射线衍射、光致发光、红外光谱、拉曼光谱和ESR光谱等方法研究了两种钠石样(样品ⅰ为来自俄罗斯曼尔曼斯克地区含碳酸盐的科夫多尔碱性超镁铁质地块的Na8Al6Si6O24Cl2⋅0.4H2O，样品ⅱ为来自Tyva共和国巴彦科尔霞石正长岩和云母岩地块的Na8Al6Si6O24Cl2⋅0.2H2O)。溶液熔体量热法测定了含水钠石样的元素生成焓:−13536±10 (I)和−13503±19 (II) kJ/mol。在ΔfH0(298.15 K) =−13446±11 kJ/mol的条件下，计算了Na8Al6Si6O24Cl2理论组分钠盐的生成焓。利用碳酸盐岩的生成焓和文献中关于碳酸盐岩的S0(298.15 K)的数据，计算了无水碳酸盐岩和含水碳酸盐岩的标准吉布斯生成能。

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来源期刊

Geochemistry International 地学-地球化学与地球物理

CiteScore

1.60

自引率

12.50%

发文量

审稿时长

1 months

期刊介绍： Geochemistry International is a peer reviewed journal that publishes articles on cosmochemistry; geochemistry of magmatic, metamorphic, hydrothermal, and sedimentary processes; isotope geochemistry; organic geochemistry; applied geochemistry; and chemistry of the environment. Geochemistry International provides readers with a unique opportunity to refine their understanding of the geology of the vast territory of the Eurasian continent. The journal welcomes manuscripts from all countries in the English or Russian language.