{"title":"Determination of the Eutectic to Peritectic Fold Transition in the Cu(Ni)–Fe–S System by Directional Crystallization of Melts","authors":"E. F. Sinyakova, I. G. Vasilyeva","doi":"10.1134/s0036023623602660","DOIUrl":null,"url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>This paper is concerned with theoretical analysis of the quasi-equilibrium directional crystallization of three-component melts. How the phase composition changes at each site of the sample and how the phase compositions change for various types of phase reactions are considered. It is shown that the eutectic reaction can change to a peritectic reaction as temperature lowers during directional crystallization. A 29.96 Fe + 21.55 Cu + 2.01 Ni + 46.49 S (at %) melt was directionally crystallized. Since nickel is present in the ingot in the form of impurities dissolved in the phases of the Cu–Fe–S system, the behavior of the melt belonging to this three-component system could be involved in data interpretation. As a result, a sample has been obtained with three zones changing one another: single-phase Fe<sub><i>z</i></sub>S<sub>1 ± δ</sub> (<i>Poss</i>), a <i>Poss</i> + (Cu,Fe)<sub>1 + <i>x</i></sub>S (<i>Iss</i>) two-phase eutectic mixture, and then single-phase <i>Iss</i>. The average composition of the solid phase changes from one discrete value to another in going to the next zone, while the melt and solid solutions in the neighboring zones have their compositions changing continuously. These results are consistent with theoretical ideas.</p>","PeriodicalId":762,"journal":{"name":"Russian Journal of Inorganic Chemistry","volume":"48 1","pages":""},"PeriodicalIF":1.8000,"publicationDate":"2024-03-11","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://doi.org/10.1134/s0036023623602660","RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"CHEMISTRY, INORGANIC & NUCLEAR","Score":null,"Total":0}
引用次数: 0
Abstract
This paper is concerned with theoretical analysis of the quasi-equilibrium directional crystallization of three-component melts. How the phase composition changes at each site of the sample and how the phase compositions change for various types of phase reactions are considered. It is shown that the eutectic reaction can change to a peritectic reaction as temperature lowers during directional crystallization. A 29.96 Fe + 21.55 Cu + 2.01 Ni + 46.49 S (at %) melt was directionally crystallized. Since nickel is present in the ingot in the form of impurities dissolved in the phases of the Cu–Fe–S system, the behavior of the melt belonging to this three-component system could be involved in data interpretation. As a result, a sample has been obtained with three zones changing one another: single-phase FezS1 ± δ (Poss), a Poss + (Cu,Fe)1 + xS (Iss) two-phase eutectic mixture, and then single-phase Iss. The average composition of the solid phase changes from one discrete value to another in going to the next zone, while the melt and solid solutions in the neighboring zones have their compositions changing continuously. These results are consistent with theoretical ideas.
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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