The High-Temperature Electrosynthesis of Dysprosium Silicides in Chloride Melts
| المصدر: | مجلة الجامعة الوطنية |
|---|---|
| الناشر: | الجامعة الوطنية |
| المؤلف الرئيسي: | Qahtan, A. M. (Author) |
| مؤلفين آخرين: | Kushkhov, Kh. B. (Co-Author), Uzdenova, A. S. (Co-Author), Tlenkopachev, M. R. (Co-Author) |
| المجلد/العدد: | ع15 |
| محكمة: | نعم |
| الدولة: |
اليمن |
| التاريخ الميلادي: |
2020
|
| الشهر: | ديسمبر |
| الصفحات: | 1 - 14 |
| DOI: |
10.46514/1971-000-015-007 |
| ISSN: |
2519-6022 |
| رقم MD: | 1313569 |
| نوع المحتوى: | بحوث ومقالات |
| اللغة: | الإنجليزية |
| قواعد المعلومات: | EduSearch, HumanIndex |
| مواضيع: | |
| كلمات المؤلف المفتاحية: |
Molten Chlorides | Dysprosium Chloride | Hexafluorosilicate-ion | Joint Electroreduction | Linear and Cyclic Voltammetry | Dysprosium Silicides | Potentio and Galvanostatic Electrolysis | High temperature Electrosynthesis
|
| رابط المحتوى: |
| المستخلص: |
In this work results of joint fluorosilicate and dysprosium-ions electroreduction and determination of high temperature electrochemical dysprosium silicides synthesis conditions are presented. The electroreduction of dysprosium and silicon ions was carried out in KCl–NaCl melts at the 973K on tungsten electrodes by the linear and cyclic voltammetry. As a result of these researches the optimal concentration ratio of dysprosium and silicon ions and anion composition in melts were established for the joint Dy and Si electroreduction. The analysis of voltammograms showed that the electroreduction process of investigated systems have a kinetic mode. Synthesis of ultra-disperse powders of dysprosium silicides was carried out by potentiostatic electrolysis in molten equimolar KCl–NaCl with DyCl3 and K2SiF6. Electrolysis was carried out on tungsten electrode in the range of -2.2 to -2.4 V relatively of the quasi-stationary glass-carbon electrode. The electrosynthesis can be represented as sequence stages: an allocation of the more electropositive component (Si); an allocation of the more electronegative component (Dy) on deposited silicon surface; the diffusion of dysprosium and silicon with formation of silicide phases. The influence of the electrolyte composition, temperature, current density, voltage, electrolysis duration on synthesis products was studied. Optimal parameters for dysprosium silicide DySi1.4 synthesis were found. |
|---|---|
| ISSN: |
2519-6022 |
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