{"title":"水热条件下Bi2O3-Al2O3-Fe2O3-P2O5-H2O体系中矾石型化合物的形成","authors":"D. P. Elovikov, O. V. Proskurina, V. V. Gusarov","doi":"10.1134/S0036023625601175","DOIUrl":null,"url":null,"abstract":"<p>The variable-composition compounds Bi(Al<sub>1–<i>x</i></sub>Fe<sub><i>x</i></sub>)<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>(OH)<sub>6</sub> with an alunite-type structure were obtained by hydrothermal synthesis in the Bi<sub>2</sub>O<sub>3</sub>–Al<sub>2</sub>O<sub>3</sub>–Fe<sub>2</sub>O<sub>3</sub>–P<sub>2</sub>O<sub>5</sub>–H<sub>2</sub>O system. Using experimental data on the miscibility limits of components in (1–<i>x</i>)BiAl<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>(OH)<sub>6</sub>–<i>x</i>BiFe<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>(OH)<sub>6</sub>, parameters of the subregular solution model were determined (<i>Q</i><sub>1</sub> = 6.395, <i>Q</i><sub>2</sub> = 8.987 kJ/mol) and the curves for spinodal and binodal decomposition of solid solutions with alunite-type structure were calculated. According to thermodynamic calculations, the compounds BiAl<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>(OH)<sub>6</sub> and BiFe<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>(OH)<sub>6</sub> can be formed at temperatures above 122 and 170°C, respectively, which is consistent with the experimental data obtained in the present study, indicating the absence of compounds with alunite-type structure at 160°C in the 0.8 < <i>x</i> ≤ 1 range.</p>","PeriodicalId":762,"journal":{"name":"Russian Journal of Inorganic Chemistry","volume":"70 7","pages":"960 - 967"},"PeriodicalIF":1.5000,"publicationDate":"2025-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Formation of Alunite-type Compounds in the Bi2O3–Al2O3–Fe2O3–P2O5–H2O System under Hydrothermal Conditions\",\"authors\":\"D. P. Elovikov, O. V. Proskurina, V. V. Gusarov\",\"doi\":\"10.1134/S0036023625601175\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>The variable-composition compounds Bi(Al<sub>1–<i>x</i></sub>Fe<sub><i>x</i></sub>)<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>(OH)<sub>6</sub> with an alunite-type structure were obtained by hydrothermal synthesis in the Bi<sub>2</sub>O<sub>3</sub>–Al<sub>2</sub>O<sub>3</sub>–Fe<sub>2</sub>O<sub>3</sub>–P<sub>2</sub>O<sub>5</sub>–H<sub>2</sub>O system. Using experimental data on the miscibility limits of components in (1–<i>x</i>)BiAl<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>(OH)<sub>6</sub>–<i>x</i>BiFe<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>(OH)<sub>6</sub>, parameters of the subregular solution model were determined (<i>Q</i><sub>1</sub> = 6.395, <i>Q</i><sub>2</sub> = 8.987 kJ/mol) and the curves for spinodal and binodal decomposition of solid solutions with alunite-type structure were calculated. According to thermodynamic calculations, the compounds BiAl<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>(OH)<sub>6</sub> and BiFe<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub>(OH)<sub>6</sub> can be formed at temperatures above 122 and 170°C, respectively, which is consistent with the experimental data obtained in the present study, indicating the absence of compounds with alunite-type structure at 160°C in the 0.8 < <i>x</i> ≤ 1 range.</p>\",\"PeriodicalId\":762,\"journal\":{\"name\":\"Russian Journal of Inorganic Chemistry\",\"volume\":\"70 7\",\"pages\":\"960 - 967\"},\"PeriodicalIF\":1.5000,\"publicationDate\":\"2025-08-26\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Russian Journal of Inorganic Chemistry\",\"FirstCategoryId\":\"92\",\"ListUrlMain\":\"https://link.springer.com/article/10.1134/S0036023625601175\",\"RegionNum\":3,\"RegionCategory\":\"化学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"CHEMISTRY, INORGANIC & NUCLEAR\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Russian Journal of Inorganic Chemistry","FirstCategoryId":"92","ListUrlMain":"https://link.springer.com/article/10.1134/S0036023625601175","RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"CHEMISTRY, INORGANIC & NUCLEAR","Score":null,"Total":0}
Formation of Alunite-type Compounds in the Bi2O3–Al2O3–Fe2O3–P2O5–H2O System under Hydrothermal Conditions
The variable-composition compounds Bi(Al1–xFex)3(PO4)2(OH)6 with an alunite-type structure were obtained by hydrothermal synthesis in the Bi2O3–Al2O3–Fe2O3–P2O5–H2O system. Using experimental data on the miscibility limits of components in (1–x)BiAl3(PO4)2(OH)6–xBiFe3(PO4)2(OH)6, parameters of the subregular solution model were determined (Q1 = 6.395, Q2 = 8.987 kJ/mol) and the curves for spinodal and binodal decomposition of solid solutions with alunite-type structure were calculated. According to thermodynamic calculations, the compounds BiAl3(PO4)2(OH)6 and BiFe3(PO4)2(OH)6 can be formed at temperatures above 122 and 170°C, respectively, which is consistent with the experimental data obtained in the present study, indicating the absence of compounds with alunite-type structure at 160°C in the 0.8 < x ≤ 1 range.
期刊介绍：
Russian Journal of Inorganic Chemistry is a monthly periodical that covers the following topics of research: the synthesis and properties of inorganic compounds, coordination compounds, physicochemical analysis of inorganic systems, theoretical inorganic chemistry, physical methods of investigation, chemistry of solutions, inorganic materials, and nanomaterials.
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