{"title":"Destinezite: A Physicochemical and Calorimetric Study","authors":"","doi":"10.1134/s0016702924030042","DOIUrl":null,"url":null,"abstract":"<span> <h3>Abstract</h3> <p>Destinezite (<span> <span>\\({\\text{Fe}}_{{1.97}}^{{3 + }}\\)</span> </span>Al<sub>0.02</sub>)(PO<sub>4</sub>)<sub>0.99</sub>(SO<sub>4</sub>)<sub>0.90</sub>(OH)<sub>1.20</sub>⋅5.97H<sub>2</sub>O (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 <span> <span>\\({\\text{Fe}}_{2}^{{3 + }}\\)</span> </span>(PO<sub>4</sub>)(SO<sub>4</sub>)(OH)⋅6H<sub>2</sub>O from elements ∆<sub>f</sub><em>H</em><sup>0</sup>(298.15 K) = –4258 ± 12 kJ/mol was determined by the method of solution calorimetry in lead borate 2PbO⋅B<sub>2</sub>O<sub>3</sub> melt on a Setaram (France) Calvet microcalorimeter. The value of its absolute entropy <em>S</em><sup>0</sup>(298.15 K) = 462.0 J/(mol K) was estimated, the entropy of formation ∆<sub>f</sub><em>S</em><sup>0</sup>(298.15 K) = –2054 J/(mol K), and the Gibbs energy of formation from the elements ∆<sub>f</sub><em>G</em><sup>0</sup>(298.15 K) = –3646 kJ/mol were calculated.</p> </span>","PeriodicalId":12781,"journal":{"name":"Geochemistry International","volume":null,"pages":null},"PeriodicalIF":0.7000,"publicationDate":"2024-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Geochemistry International","FirstCategoryId":"89","ListUrlMain":"https://doi.org/10.1134/s0016702924030042","RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"GEOCHEMISTRY & GEOPHYSICS","Score":null,"Total":0}
引用次数: 0
Abstract
Destinezite (\({\text{Fe}}_{{1.97}}^{{3 + }}\)Al0.02)(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.
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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