THE PRECIPITATION OF IRON SULPHIDES BY THE CRYSTALLIZATION OF HALIDE MELTS IN SULPHUR ATMOSPHERE
A new approach to a single crystals growth of the iron sulphide phases of de nite structure and nonstoichiometry is developed and applied. This approach is based on the iron sulphides recrystallization from the solutions of these sulphides in the iron (II) halide melts at the xed vapor pressure of...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Voronezh State University
2017-03-01
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| Series: | Конденсированные среды и межфазные границы |
| _version_ | 1828395611119943680 |
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| author | Berezin Sergey S. Zavrazhnov Alexander Y. Naumov Alexander V Volkov Vyacheslav V. Sergeeva Anastasiya V. Spesivtseva Alexandra P. |
| author_facet | Berezin Sergey S. Zavrazhnov Alexander Y. Naumov Alexander V Volkov Vyacheslav V. Sergeeva Anastasiya V. Spesivtseva Alexandra P. |
| author_sort | Berezin Sergey S. |
| collection | DOAJ |
| description | A new approach to a single crystals growth of the iron sulphide phases of de nite structure and nonstoichiometry is developed and applied. This approach is based on the iron sulphides
recrystallization from the solutions of these sulphides in the iron (II) halide melts at the xed vapor pressure of sulphur. The recrystallization procedure is carried out in a closed non-isothermal system: the charge – the weight of iron sulphide and the solvent – the weight of iron (II) halide are located
in the “hot” end of the silica ampoule at the temperature T 2 and the source of sulphur (pure S) is concentrated in the opposite “cold” end of ampoule. The vapor pressure of sulphur is controlled by the temperature of the “cold” zone (T 1 ). In the course of each grown experiment the temperature T 1 was unvaried (so the pressure of sulphur was unvaried too) and the temperature of the “hot” zone T 2 was decreased slowly (usually from 690 to 660 °C). Pyrite single crystals was grown using the chloride and the bromide melts as the solvents when the vapor pressure of sulphur vapor was in the range from 0.42 to 9.4 bar. The lattice constant “a” was equal to 0.5412 - 0.5413 nm. The mixture of pyrite
(-FeS2) and trigonal phase of Fe1–xS was detected when the vapor pressure of sulphur was smaller than 0.25 bar. In the experiments with the iodide melts the almost complete oxidation of ion I- (to I2) by sulphur and the crystallization of iron sulphides were found. This paper proposes a mechanism for the generation of the iron sulphide phases from the iron halide melts. |
| first_indexed | 2024-12-10T08:16:02Z |
| format | Article |
| id | doaj.art-641e5e30ba56408b9b32482320b977f9 |
| institution | Directory Open Access Journal |
| issn | 1606-867X 1606-867X |
| language | English |
| last_indexed | 2024-12-10T08:16:02Z |
| publishDate | 2017-03-01 |
| publisher | Voronezh State University |
| record_format | Article |
| series | Конденсированные среды и межфазные границы |
| spelling | doaj.art-641e5e30ba56408b9b32482320b977f92022-12-22T01:56:28ZengVoronezh State UniversityКонденсированные среды и межфазные границы1606-867X1606-867X2017-03-01191273610.17308/kcmf.2017.19/173THE PRECIPITATION OF IRON SULPHIDES BY THE CRYSTALLIZATION OF HALIDE MELTS IN SULPHUR ATMOSPHEREBerezin Sergey S.0Zavrazhnov Alexander Y.1Naumov Alexander V2Volkov Vyacheslav V.3Sergeeva Anastasiya V.4Spesivtseva Alexandra P.5Lecturer, Department of General and Inorganic Chemistry, Voronezh State UniversityDr. Sci. (Chem.), Department of General and Inorganic Chemistry, Voronezh State UniversityCand. Sci. (Chem.), Researcher, Department of General and Inorganic ChemistryCand. Sci. (Chem.), Leading Researcher, Institute of General and Inorganic ChemistryCand. Sci. (Chem.), Senior Researcher, Institute of Volcanology and Seismology, Far East Branch, Russian Academy of Sciences, Petropavlovsk- Kamchatski4-y. student, Department of General and Inorganic ChemistryA new approach to a single crystals growth of the iron sulphide phases of de nite structure and nonstoichiometry is developed and applied. This approach is based on the iron sulphides recrystallization from the solutions of these sulphides in the iron (II) halide melts at the xed vapor pressure of sulphur. The recrystallization procedure is carried out in a closed non-isothermal system: the charge – the weight of iron sulphide and the solvent – the weight of iron (II) halide are located in the “hot” end of the silica ampoule at the temperature T 2 and the source of sulphur (pure S) is concentrated in the opposite “cold” end of ampoule. The vapor pressure of sulphur is controlled by the temperature of the “cold” zone (T 1 ). In the course of each grown experiment the temperature T 1 was unvaried (so the pressure of sulphur was unvaried too) and the temperature of the “hot” zone T 2 was decreased slowly (usually from 690 to 660 °C). Pyrite single crystals was grown using the chloride and the bromide melts as the solvents when the vapor pressure of sulphur vapor was in the range from 0.42 to 9.4 bar. The lattice constant “a” was equal to 0.5412 - 0.5413 nm. The mixture of pyrite (-FeS2) and trigonal phase of Fe1–xS was detected when the vapor pressure of sulphur was smaller than 0.25 bar. In the experiments with the iodide melts the almost complete oxidation of ion I- (to I2) by sulphur and the crystallization of iron sulphides were found. This paper proposes a mechanism for the generation of the iron sulphide phases from the iron halide melts. |
| spellingShingle | Berezin Sergey S. Zavrazhnov Alexander Y. Naumov Alexander V Volkov Vyacheslav V. Sergeeva Anastasiya V. Spesivtseva Alexandra P. THE PRECIPITATION OF IRON SULPHIDES BY THE CRYSTALLIZATION OF HALIDE MELTS IN SULPHUR ATMOSPHERE Конденсированные среды и межфазные границы |
| title | THE PRECIPITATION OF IRON SULPHIDES BY THE CRYSTALLIZATION OF HALIDE MELTS IN SULPHUR ATMOSPHERE |
| title_full | THE PRECIPITATION OF IRON SULPHIDES BY THE CRYSTALLIZATION OF HALIDE MELTS IN SULPHUR ATMOSPHERE |
| title_fullStr | THE PRECIPITATION OF IRON SULPHIDES BY THE CRYSTALLIZATION OF HALIDE MELTS IN SULPHUR ATMOSPHERE |
| title_full_unstemmed | THE PRECIPITATION OF IRON SULPHIDES BY THE CRYSTALLIZATION OF HALIDE MELTS IN SULPHUR ATMOSPHERE |
| title_short | THE PRECIPITATION OF IRON SULPHIDES BY THE CRYSTALLIZATION OF HALIDE MELTS IN SULPHUR ATMOSPHERE |
| title_sort | precipitation of iron sulphides by the crystallization of halide melts in sulphur atmosphere |
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