Electrochemical Preparation of DyFe2 Alloy from the Solid Mixture of Dy2O3 and Fe2O3 in Molten CaCl2

Chenming Fan, Guoqing Li, Xiaolong Liu, Qingfeng Li*, Bing Li

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The mixed oxide pellet was prepared by pressing the mixture of Dy2O3+Fe2O3+5% wt PVB+25% wt carbon powders (Dy: Fe = 1: 2) under 15 MPa, then a porous cathode pellet was obtained by sintering in air in the range of 800 similar to 1200 degrees C. The cathode pellet sintered in air for 2 h at 1200 degrees C has composed of Fe2O3 and Dy3Fe5O12 phases with a porous structure. DyFe2 alloy was successfully obtained through direct electrochemical reduction of the cathode pellet sintered at 1200 degrees C at 3.2 V inmolten CaCl2 at 900 degrees C for 10 h. The necessary conditions for obtaining the alloys are as follows: (1) high enough voltage (3.2 V); (2) formation of Dy3Fe5O12; (3) 10 h electrolysis time. By combining cyclic voltammograms with XRD results, the electrochemical reduction processes of the cathode pellet were proposed as following: The reduction of Fe2O3 to Fe as well as Dy3Fe5O12 to Fe and Dy2O3 occurred first, followed by the reduction of Dy2O3 on the produced Fe to form DyFe3, and then Dy2O3 reduction on DyFe3 to form DyFe2 alloy phases. (C) 2019 The Electrochemical Society.
Original languageEnglish
JournalJournal of the Electrochemical Society
Volume166
Issue number13
Pages (from-to)D589-D594
ISSN0013-4651
DOIs
Publication statusPublished - 2019

Cite this

Fan, Chenming ; Li, Guoqing ; Liu, Xiaolong ; Li, Qingfeng ; Li, Bing. / Electrochemical Preparation of DyFe2 Alloy from the Solid Mixture of Dy2O3 and Fe2O3 in Molten CaCl2. In: Journal of the Electrochemical Society. 2019 ; Vol. 166, No. 13. pp. D589-D594.
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title = "Electrochemical Preparation of DyFe2 Alloy from the Solid Mixture of Dy2O3 and Fe2O3 in Molten CaCl2",
abstract = "The mixed oxide pellet was prepared by pressing the mixture of Dy2O3+Fe2O3+5{\%} wt PVB+25{\%} wt carbon powders (Dy: Fe = 1: 2) under 15 MPa, then a porous cathode pellet was obtained by sintering in air in the range of 800 similar to 1200 degrees C. The cathode pellet sintered in air for 2 h at 1200 degrees C has composed of Fe2O3 and Dy3Fe5O12 phases with a porous structure. DyFe2 alloy was successfully obtained through direct electrochemical reduction of the cathode pellet sintered at 1200 degrees C at 3.2 V inmolten CaCl2 at 900 degrees C for 10 h. The necessary conditions for obtaining the alloys are as follows: (1) high enough voltage (3.2 V); (2) formation of Dy3Fe5O12; (3) 10 h electrolysis time. By combining cyclic voltammograms with XRD results, the electrochemical reduction processes of the cathode pellet were proposed as following: The reduction of Fe2O3 to Fe as well as Dy3Fe5O12 to Fe and Dy2O3 occurred first, followed by the reduction of Dy2O3 on the produced Fe to form DyFe3, and then Dy2O3 reduction on DyFe3 to form DyFe2 alloy phases. (C) 2019 The Electrochemical Society.",
author = "Chenming Fan and Guoqing Li and Xiaolong Liu and Qingfeng Li and Bing Li",
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Electrochemical Preparation of DyFe2 Alloy from the Solid Mixture of Dy2O3 and Fe2O3 in Molten CaCl2. / Fan, Chenming; Li, Guoqing; Liu, Xiaolong; Li, Qingfeng; Li, Bing.

In: Journal of the Electrochemical Society, Vol. 166, No. 13, 2019, p. D589-D594.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Electrochemical Preparation of DyFe2 Alloy from the Solid Mixture of Dy2O3 and Fe2O3 in Molten CaCl2

AU - Fan, Chenming

AU - Li, Guoqing

AU - Liu, Xiaolong

AU - Li, Qingfeng

AU - Li, Bing

PY - 2019

Y1 - 2019

N2 - The mixed oxide pellet was prepared by pressing the mixture of Dy2O3+Fe2O3+5% wt PVB+25% wt carbon powders (Dy: Fe = 1: 2) under 15 MPa, then a porous cathode pellet was obtained by sintering in air in the range of 800 similar to 1200 degrees C. The cathode pellet sintered in air for 2 h at 1200 degrees C has composed of Fe2O3 and Dy3Fe5O12 phases with a porous structure. DyFe2 alloy was successfully obtained through direct electrochemical reduction of the cathode pellet sintered at 1200 degrees C at 3.2 V inmolten CaCl2 at 900 degrees C for 10 h. The necessary conditions for obtaining the alloys are as follows: (1) high enough voltage (3.2 V); (2) formation of Dy3Fe5O12; (3) 10 h electrolysis time. By combining cyclic voltammograms with XRD results, the electrochemical reduction processes of the cathode pellet were proposed as following: The reduction of Fe2O3 to Fe as well as Dy3Fe5O12 to Fe and Dy2O3 occurred first, followed by the reduction of Dy2O3 on the produced Fe to form DyFe3, and then Dy2O3 reduction on DyFe3 to form DyFe2 alloy phases. (C) 2019 The Electrochemical Society.

AB - The mixed oxide pellet was prepared by pressing the mixture of Dy2O3+Fe2O3+5% wt PVB+25% wt carbon powders (Dy: Fe = 1: 2) under 15 MPa, then a porous cathode pellet was obtained by sintering in air in the range of 800 similar to 1200 degrees C. The cathode pellet sintered in air for 2 h at 1200 degrees C has composed of Fe2O3 and Dy3Fe5O12 phases with a porous structure. DyFe2 alloy was successfully obtained through direct electrochemical reduction of the cathode pellet sintered at 1200 degrees C at 3.2 V inmolten CaCl2 at 900 degrees C for 10 h. The necessary conditions for obtaining the alloys are as follows: (1) high enough voltage (3.2 V); (2) formation of Dy3Fe5O12; (3) 10 h electrolysis time. By combining cyclic voltammograms with XRD results, the electrochemical reduction processes of the cathode pellet were proposed as following: The reduction of Fe2O3 to Fe as well as Dy3Fe5O12 to Fe and Dy2O3 occurred first, followed by the reduction of Dy2O3 on the produced Fe to form DyFe3, and then Dy2O3 reduction on DyFe3 to form DyFe2 alloy phases. (C) 2019 The Electrochemical Society.

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