Destinezite: A Physicochemical and Calorimetric Study

IF 0.7 4区地球科学 Q4 GEOCHEMISTRY & GEOPHYSICS

Geochemistry International Pub Date : 2024-03-01 DOI:10.1134/s0016702924030042

引用次数: 0

Abstract

Destinezite ( \({\text{Fe}}_{{1.97}}^{{3 + }}\) Al_0.02)(PO₄)_0.99(SO₄)_0.90(OH)_1.20⋅5.97H₂O (Czech Republic) has been studied by thermal and electron-microprobe analyses, X-ray powder diffraction, and by IR, Raman, and Mössbauer spectroscopy. The enthalpy of formation of destinezite \({\text{Fe}}_{2}^{{3 + }}\) (PO₄)(SO₄)(OH)⋅6H₂O from elements ∆_fH⁰(298.15 K) = –4258 ± 12 kJ/mol was determined by the method of solution calorimetry in lead borate 2PbO⋅B₂O₃ melt on a Setaram (France) Calvet microcalorimeter. The value of its absolute entropy S⁰(298.15 K) = 462.0 J/(mol K) was estimated, the entropy of formation ∆_fS⁰(298.15 K) = –2054 J/(mol K), and the Gibbs energy of formation from the elements ∆_fG⁰(298.15 K) = –3646 kJ/mol were calculated.

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天青石：物理化学和量热研究

Abstract Destinezite ( \({\{Fe}}_{{1.97}}^{{3 + }}\) Al0.02)(PO4)0.99(SO4)0.90(OH)1.20⋅5.97H2O (捷克共和国)已通过热分析、电子探针分析、X射线粉末衍射以及红外光谱、拉曼光谱和莫斯鲍尔光谱进行了研究。在一台 Setaram（法国）Calvet 微量热仪上，通过溶液量热法测定了元素 ∆fH0(298.15 K) = -4258 ± 12 kJ/mol 在硼酸铅 2PbO⋅B2O3 熔体中的形成焓。估算了其绝对熵值 S0(298.15 K) = 462.0 J/(mol K)，计算了形成熵 ∆fS0(298.15 K) = -2054 J/(mol K)，以及元素形成的吉布斯能 ∆fG0(298.15 K) = -3646 kJ/mol。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.

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