THE PREPARATION OF HIGH PURITY RARE EARTH METALS BY ZONE REFINING

1963 ◽  
Author(s):  
C. J. Heinink
Keyword(s):  
Rare Earth ◽  
High Purity ◽  
Rare Earth Metals ◽  
Zone Refining

scholarly journals Magnetic and Electronic Properties of Heavy Lanthanides (Gd, Tb, Dy, Er, Ho, Tm)

Crystals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 82
Author(s):  
Radel R. Gimaev ◽  
Aleksei S. Komlev ◽  
Andrei S. Davydov ◽  
Boris B. Kovalev ◽  
Vladimir I. Zverev
Keyword(s):  
Rare Earth ◽  
Electronic Properties ◽  
High Purity ◽  
Materials Science ◽  
Rapid Development ◽  
Rare Earth Metals ◽  
State University ◽  
Important Place ◽  
Heavy Lanthanides ◽  
Baikov Institute

Rare earth metals (REM) occupy a special and important place in our lives. This became especially noticeable during the rapid development of industry in the industrial era of the twentieth century. The tendency of development of the rare-earth metals market certainly remains in the XXI century. According to experts estimates the industry demand for chemical compounds based on them will tend to grow during the nearest years until it reaches the market balance. At the same time, the practical use of high-purity rare-earth metals requires the most accurate understanding of the physical properties of metals, especially magnetic ones. Despite a certain decline in interest in the study of high-purity REM single crystals during the last decade, a number of scientific groups (Ames Lab, Lomonosov Moscow State University (MSU), Baikov Institute of Metallurgy and Materials Science Russian Academy of Science (RAS)) are still conducting high-purity studies on high-purity metal samples. The present article is a combination of a review work covering the analysis of the main works devoted to the study of heavy REMs from gadolinium to thulium, as well as original results obtained at MSU. The paper considers the electronic properties of metals in terms of calculating the density of states, analyzes the regularities of the magnetic phase diagrams of metals, gives the original dependences of the Neel temperature and tricritical temperatures for Gd, Tb, Dy, Er, Ho, Tm, and also introduces a phenomenological parameter that would serve as an indicator of the phase transformation in heavy REMs.

Zone refining of rare earth metals: Lanthanum, cerium and gadolinium

1981 ◽  
Vol 81 (2) ◽  
pp. 273-292 ◽  
Author(s):  
D. Fort ◽  
D.W. Jones ◽  
B.J. Beaudry ◽  
K.A. Gschneidner
Keyword(s):  
Rare Earth ◽  
Rare Earth Metals ◽  
Zone Refining

scholarly journals Research Progress in Preparation and Purification of Rare Earth Metals

Metals ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1376
Author(s):  
Hang Liu ◽  
Yao Zhang ◽  
Yikun Luan ◽  
Huimin Yu ◽  
Dianzhong Li
Keyword(s):  
Rare Earth ◽  
High Purity ◽  
Rare Earth Metals ◽  
Melting Zone ◽  
Thermal Reduction ◽  
Zone Melting ◽  
Research Progress ◽  
Molten Salt Electrolysis ◽  
Interstitial Impurities ◽  
Metallic Impurities

The purity of rare earth metals is one of the most important factors to research and develop high technique materials. However, high purity rare earth metals are not easily achieved. This review summarizes the preparation and purification methods of rare earth metals. First, the preparation principle and process of molten salt electrolysis and metal thermal reduction are introduced. The main sources of metallic impurities and interstitial impurities in rare earth metals as well as the action mechanism of reducing the concentration of different impurities are analyzed and summarized. Then, the purification principle and process of vacuum distillation, arc melting, zone melting, and solid state electromigration are also discussed. Furthermore, the removal effect and function rule of metallic impurities and interstitial impurities in rare earth metals are outlined. Finally, the crucial issues in the development of high purity rare earth metals are put forward, and the development direction of high purity rare earth metals in future are pointed out on this basis.

Development of nanostructured magnetic materials based on high-purity rare-earth metals and study of their fundamental characteristics

2014 ◽  
Vol 56 (9) ◽  
pp. 1778-1784 ◽  
Author(s):  
I. A. Pelevin ◽  
I. S. Tereshina ◽  
G. S. Burkhanov ◽  
S. V. Dobatkin ◽  
T. P. Kaminskaya ◽  
...  
Keyword(s):  
Rare Earth ◽  
Magnetic Materials ◽  
High Purity ◽  
Rare Earth Metals

Electrowinning of High Purity Individual Rare Earth Metals - A Review

1991 ◽  
Vol 30 ◽  
pp. 61-72 ◽  
Author(s):  
P.N. Mohan Das ◽  
A.D. Damodaran ◽  
M. Subhash
Keyword(s):  
Rare Earth ◽  
High Purity ◽  
Rare Earth Metals

Influence of Impurities on Magnetic Transitions in High Purity Rare Earth Metals

1991 ◽  
Vol 62-64 ◽  
pp. 637-638
Author(s):  
Gennady S. Burkhanov ◽  
L.A. Boyarsky ◽  
O.D. Chistayakov ◽  
N.B. Kolchugina
Keyword(s):  
Rare Earth ◽  
High Purity ◽  
Rare Earth Metals ◽  
Magnetic Transitions ◽  
Influence Of Impurities

scholarly journals Applications of Rare Earth Metals in Al-Si Cast Alloys

2021 ◽  
Author(s):  
Mohamed Gamal Mahmoud ◽  
Yasser Zedan ◽  
Agnes-Marie Samuel ◽  
Victor Songmene ◽  
Herebert W. Doty ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Grain Size ◽  
Rare Earth ◽  
High Purity ◽  
Eutectic Silicon ◽  
Rare Earth Metals ◽  
Grain Refining ◽  
Cast Alloys ◽  
Noticeable Reduction ◽  
The Cost

The present article reviews a large number of research publications on the effect of mischmetal (MM), rare earth metals (RE), La or Ce, and combinations of La + Ce on the performance of Al-Si cast alloys mainly 319, 356, 380, 413, and 390 alloys. Most of these articles focused on the use of rare earth metals as a substitute for strontium (Sr) as a eutectic silicon (Si) modifier if added in low percentage (< 1 wt.%) to avoid precipitation of a significant amount of insoluble intermetallics and hence poor mechanical properties. Other points that were considered were the affinity of RE to react with Sr., reducing its effectiveness as modifier, as well as the grain refining efficiency of the added RE in any form. None of these articles mentioned the exact composition of the RE used and percentage of tramp elements inherited from the parent ore. Using high purity La or Ce proved to have no effect on the Si shape, size or distribution, in particular at low solidification rates (thick sections). However, regardless the source of the RE, its addition to Sr-modified alloys reduced the modification effect. As for grain refining, apparently a high percentage of RE (> 1 wt.%) is required to achieve a noticeable reduction in grain size, however at the cost of alloy brittleness.

Zone Refining of Rare Earth Metals

1978 ◽  
pp. 309-314 ◽  
Author(s):  
D. W. Jones ◽  
D. Fort ◽  
D. A. Hukin
Keyword(s):  
Rare Earth ◽  
Rare Earth Metals ◽  
Zone Refining

Preparation of High Purity Rare Earth Metals of Samarium, Ytterbium and Thulium

2016 ◽  
Vol 45 (11) ◽  
pp. 2793-2797 ◽  
Author(s):  
Zhang Xiaowei ◽  
Wang Zhiqiang ◽  
Chen Dehong ◽  
Li Zongan ◽  
Miao Ruiying ◽  
...  
Keyword(s):  
Rare Earth ◽  
High Purity ◽  
Rare Earth Metals
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