The influence of chemical impurities on the properties of heavy rare-earth metals (Tb, Dy, Ho): Experimental and theoretical approaches

Komlev, Aleksei S.; Gimaev, Radel R.; Davydov, A.S.; Zverev, V. I.

doi:10.1016/j.mtla.2021.101166

Cited by 9 publications

(3 citation statements)

References 82 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[1][2][3][4][5][6] This is because the dissolved impurities in these metals affect the physical, chemical, and electro-optic properties. [7][8][9][10] The ultimate utilization of these ultra-purity level metals/metalloids thus lies in developing high-DOI: 10.1002/crat.202300347 quality semiconductors for the production of high-performance electronic devices and gadgets. [1,4,5] In our earlier work, we have experimentally demonstrated this essence of ultra-purification by preparing GaAs epitaxial layers using 5N2 (99.9992%) and 7N2 (99.999992%) purified gallium.…”

Section: Introductionmentioning

confidence: 99%

A Review on the Zone Refining Process Technology toward Ultra‐Purification of Gallium for GaAs/GaN‐based Optoelectronic Device Applications

Ghosh,

Mani

2024

Cryst. Res. Technol.

View full text Add to dashboard Cite

Ultrapure gallium up to 99.9999%/ 99.99999% (6N/7N) purity level is a highly demanding material needed for the growth of gallium‐based group III–V semiconductor compounds and optoelectronic devices. However, general extraction of gallium from Bayer liquor contains high impurity content and ultra‐purification of the same cannot be accomplished by a single step. Thus, the purpose of this review is to assess various purification processes for the production of ultra‐pure gallium and to critically examine its applications in the optoelectronics industry. Through this research survey, it is found that zone refining of the zone melting process stands tall over other methods in purifying materials even up to 13N. Hence, scientists are adopting detailed mathematical models and simulation tools for designing unique zone refining systems for material purification. Current‐day technology even adopts intelligence methods such as machine learning, which sheds light on the importance of different zone refining parameters that influence the purification process. Here, the practical aspects of zone refining and how the feedback from the theoretical models or performance prediction through intelligence methods can be effectively incorporated into practice have also been emphasized

show abstract

Section: Introductionmentioning

confidence: 99%

A Review on the Zone Refining Process Technology toward Ultra‐Purification of Gallium for GaAs/GaN‐based Optoelectronic Device Applications

Ghosh,

Mani

2024

Cryst. Res. Technol.

View full text Add to dashboard Cite

show abstract

“…Its crystal structure is unique in that it has bilayer Fe 2 As 2 layers [16]. At present, it has been found that a series of unique behaviors of 12442 may be related to these bilayer Fe 2 As 2 layers, such as the T c not being greatly affected by the purity [17] of the material; it not being greatly affected by the magnetic properties of lanthanide atoms; and the relationship of the T c to the bond angle of Fe-As and the height of the As atom relative to the Fe layer is inconsistent with the empirical rules of the previous numerical study [18]. At present, Ghosh et al have discussed the electronic properties of KCa 2 Fe 4 As 4 F 2 [19], RbCa 2 Fe 4 As 4 F 2 , and CsCa 2 Fe 4 As 4 F 2 , and studies have shown that 12442 compounds have mixed multi-orbital and multi-band properties, and the contributions of these compounds are mainly from Fe-3D orbitals [20].…”

Section: Introductionmentioning

confidence: 99%

Role of Lanthanides and Bilayer Fe2As2 in the Electronic Properties of RbLn2Fe4As4O2 (Ln = Gd, Tb, and Dy) Superconductors

et al. 2023

View full text Add to dashboard Cite

The superconducting transition temperatures (Tc) of RbGd2Fe4As4O2, RbTb2Fe4As4O2, and RbDy2Fe4As4O2 are 35 K, 34.7 K, and 34.3 K without doping, respectively. For the first time, we have studied the high-temperature nonmagnetic state and the low-temperature magnetic ground state of 12442 materials, RbTb2Fe4As4O2 and RbDy2Fe4As4O2, using first principles calculations and comparing them with RbGd2Fe4As4O2. We also performed a detailed study of the effects of lanthanides and bilayer Fe2As2. We predict that the ground state of RbLn2Fe4As4O2 (Ln = Gd, Tb, and Dy) is spin-density-wave-type, in-plane, striped antiferromagnets, and the magnetic moment around each Fe atom is about 2 μB. We also found that the structural differences caused by the simple ionic radius have little effect on the properties of these three materials. Different lanthanide elements themselves play a major role in the electronic properties of the materials. It can be confirmed that the effect of Gd on RbLn2Fe4As4O2 is indeed different from that of Tb and Dy, and the presence of Gd is more conducive to interlayer electron transfer. This means that Gd can transfer more electrons from the GdO layer to the FeAs layer compared to Tb and Dy. Therefore, RbGd2Fe4As4O2 has a stronger internal coupling strength of the bilayer Fe2As2 layer. This can explain why the Tc of RbGd2Fe4As4O2 is slightly higher than that of RbTb2Fe4As4O2 and RbDy2Fe4As4O2.

show abstract

“…For example, rare earth's limited reserves and the monopoly of certain countries lead to an unstable supply of rare earth PM materials, which directly affects their cost. Therefore, many recent studies have been conducted to reduce or completely exclude rare earth elements in permanent magnets [2][3][4][5][6][7][8]. However, if the content of rare earth elements in the permanent magnet is reduced or removed, the coercive force of the permanent magnet is lowered, and the thermal properties deteriorate.…”

Section: Introductionmentioning

confidence: 99%

Irreversible Demagnetization Improvement Process of Hybrid Traction Motors with Dy-Free Magnets

Song

Pyo²,

Nam³

et al. 2022

Machines

View full text Add to dashboard Cite

Permanent magnet synchronous motors (PMSMs), with their high power density, high efficiency, and thermal stability, are widely used nowadays. PMSM magnets are composed of rare earth elements. However, rare earth elements are subject to severe price fluctuations because of their limited availability and the monopoly of some countries. Therefore, extensive research on magnets devoid of rare earth elements has been conducted recently. Although a magnet devoid of rare earth elements has a high irreversible demagnetization rate at high temperatures owing to its low coercive force, an irreversible demagnetization improvement process is proposed in this paper to compensate for this disadvantage. This process analyzes the contribution of the magnet’s back EMF (electromotive force) using the flux linkage equation, which does not change with time. Next, the location of irreversible demagnetization is moved to a position with a low contribution to the back electromotive force. Consequently, even if irreversible demagnetization occurs at the same size, the irreversible demagnetization ratio is reduced. The proposed process can minimize irreversible demagnetization while maintaining performance.

show abstract

The influence of chemical impurities on the properties of heavy rare-earth metals (Tb, Dy, Ho): Experimental and theoretical approaches

Cited by 9 publications

References 82 publications

A Review on the Zone Refining Process Technology toward Ultra‐Purification of Gallium for GaAs/GaN‐based Optoelectronic Device Applications

A Review on the Zone Refining Process Technology toward Ultra‐Purification of Gallium for GaAs/GaN‐based Optoelectronic Device Applications

Role of Lanthanides and Bilayer Fe2As2 in the Electronic Properties of RbLn2Fe4As4O2 (Ln = Gd, Tb, and Dy) Superconductors

Irreversible Demagnetization Improvement Process of Hybrid Traction Motors with Dy-Free Magnets

Contact Info

Product

Resources

About