A brief review of the development of RE 2 TM 17 permanent magnets is followed by a summary of the state‐of‐the‐art. Excellent magnetic properties have been achieved in the laboratory for single‐phase 2:17 and two‐phase, precipitation hardened magnets of ∼2:15 stoichiometry.

Rare earth magnets are known for their superior magnetic properties—high induction, and coercive force. These properties arise due to the extremely high …

Novel Ternary Fe-Rich Rare Earth Intermetallics. The structures and the magnetic properties of some novel ternary compounds were studied. A large number of compounds have the approximate composition RFe10T2, where T represents Cr, V, Ti, Mo, W or Si. The crystal structure of these latter compounds can be derived from the tetragonal ThMn12 ...

The luminescence and laser properties of rare earth are produced by the transition of 4f electrons between different energy levels. Due to its special properties, rare earth ions doped optical-functional glass have played important roles in high power laser system, whether as active or passive components. Nd3+, Er3+ doped phosphate laser …

Incorporating rare earth ions in Ge-based sulfide glass matrix is facilitated in presence of Ga, leading to glasses with higher rare earth content and less clustering. Due to the lower charge of Ga relative to Ge, electron donors such as rare earth dopants act as charge-balancing cations for GaS 4/2 tetrahedra, offering preferred ...

To satisfy an increased demand on magnetic energy product, rare-earth-transition-metal (RE-TM) magnets (SmCo 5, Sm 2 Co 17 and Nd 2 Fe 14 B, etc.) were invented with a booming increase in permanent magnetic performance. The maximum magnetic energy product ( BH) max significantly increases from ∼3 MGOe (24 kJ/m 3) …

After an explanation of the general circumstances in which the use of permanent magnets in accelerators is desirable, a number of specific magnets will be discussed. That discussion includes magnets needed for the operation of accelerators as well as magnets that are employed for the utilization of charged particle beams, such as the production of …

Since the renaissance of solid-state lasers in the mid-1980s numerous types of continuous and pulsed lasers on the basis of transition metal (TM) and rare earth (RE) ions have been developed. Many new laser wavelengths have been realised, but a few wavelength gaps still exist, for example in the yellow and blue/near UV spectral range.

The rise of semiconductor-based pump sources such as In x Ga 1-x N-laser diodes or frequency-doubled optically pumped semiconductor lasers with emission wavelengths in the blue encourages a revisitation of the rare-earth ions Pr 3+, Sm 3+, Tb 3+, Dy 3+, Ho 3+ and Er 3+ with respect to their properties as active ions in crystalline …

Among the first crystallized melt quenched alloys to exhibit interesting hard magnetic properties was (Fe 0.82 B 0.18) 0.9 Tb 0.05 La 0.05.The high coercive force of this alloy results from a mixture of R 6 Fe 2 3 and Fe 3 B phases with a very fine grained microstructure (∼300 Å). The hard magnetic state only exists over a narrow range of …

Volume 13, January 2022, 100140. (INVITED)A review on rare-earth activated SnO2-based photonic structures: Synthesis, fabrication and photoluminescence properties. Thi Ngoc LamTranabc, AnnaSzczurekb, AnnaLukowiakd, AlessandroChiaserab. Show more. Add …

Micromagnetic calculations using a finite element technique rigorously describe the magnetic properties of novel, isotropic rare‐earth‐based composite magnets. Numerical results obtained for a composite material of Nd 2 Fe 14 B, SmCo 5 or Sm 2 (Fe 0.8 Co 0.2 ) 17 N 2.8 and α‐Fe particles show that remanence, coercivity, and coercive ...

There are several methods for fabricating MIR lasers including the semiconductor technology, nonlinear techniques, and direct mission of dopant ions; particularly, rare earth (RE) ion-doped solid-state lasers have dominated the laser market [5]. However, MIR laser technology is poorly developed and the output power and …

Sloustcher said the heavy rare earths will be refined in a different building, adding that the project is just getting started. To fully domesticate the magnet supply chain, MP Materials also began construction on the United States' first rare earth magnetics factory in April 2022. Located in Fort Worth, Texas, the facility will be able to ...

Release date. January 2024. Region. Worldwide. Survey time period. 2023. Supplementary notes. REO = rare earth oxides. All figures are estimates. Open this statistic in... Spanish. German.

Rare earth (RE) magnets have become virtually indispensible in a wide variety of industries such as aerospace, automotive, electronics, medical, and military. RE elements are essential ingredients ...

A new compound composed of Nd, Fe, and a small quantity of B (about 1 wt. %) has been found, which has a tetragonal structure with lattice constants a=0.880 nm and c=1.221 nm. This phase, which has the approximate composition, 12 at. % Nd, 6 at. % B and balance Fe, possesses remarkable magnetic properties. From the approach to saturation an …

At present, the rare-earth ions that can achieve room temperature MIR laser operation in the 2.7–3 µm spectral region are mainly Er3+ Er 3 +, Ho3+ Ho 3 +, and Dy3+ Dy 3 +, among which the Er3+ Er 3 + ion is mostly studied. Nevertheless, the MIR emission spectrum of the Er3+ Er 3 + ion is a line, and the corresponding output wavelength is ...

Request PDF | Optically pumped rare-earth-doped Al 2 O 3 distributed-feedback lasers on silicon [Invited] | This paper reviews recent progress in the field of optically pumped rare-earth-doped ...

New rare-earth iron intermetallic compounds have been generated from existing series by the reaction of powder with an appropriate gas at about 500°C. Interstitial atoms occupy sites adjacent to the rare earth, thereby creating a crystal field that reflects the new local symmetry. They also expand the lattice, which greatly modifies the Fe-Fe ...

So far, we have studied (Er 0.1 Y 0.9 ) 2 SiO 5 crystalline compounds as a gain medium for silicon photonics using the layer-by-layer approach, however, the refractive index is as low as 1.8. 24 ...

Despite their name, rare earth element s (with the exceptio n of the highly uns table promethium) are re latively plentif ul in the Earth 's crus t, w ith cer ium being the 25th most abundan t ...

In this regard, alloying Pt with rare earth metals (REM) has emerged as a promising approach. This short review summarizes and discusses the most relevant advances on Pt-REM alloy electrocatalysts, from bulk polycrystalline surfaces to carbon supported nanostructures, for the oxygen reduction reaction (ORR), and their …

Cobalt‐free permanent magnet materials based on iron‐rare‐earth alloys (invited) G. Hadjipanayis, R. Hazelton, K. Lawless. Published 15 March 1984. Materials Science, Physics. Journal of Applied Physics. The magnetic properties of rapidly quenched FeRM alloys where R=La,Y,Pr,Nd,Gd and M=B,Si,Al,Ga,Ge have been investigated over a …

Abstract. The rare earth permanent-magnet alloys are the broadly used foundational functional materials. Rare earth permanent-magnet alloys have achieved great progress in scientific research, manufacturing and application in recent few decades, and their applications have pervaded into every region of national economy.

Rare‐earth iron alloys offer promise for the realization of the highest‐energy product attainable. We have investigated rare‐earth iron alloys by melt spinning and …

Rare-earth-doped amorphous aluminum oxide thin films have been deposited onto silicon wafers by RF reactive co-sputtering from metallic Al and rare-earth targets, the spectroscopy and optical gain of Er3+, Yb3+, Nd3+, and Tm3+ ions has been investigated, and the near-infrared laser transitions near 1 μm in Yb3+, 1.5 μm in Er3+, and 2 μm in ...

A series of interstitial ternary nitrides R2Fe17N3−δ has been prepared via a gas‐solid reaction for R=Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Lu, and Y. These nitrides have structures related to the Th2Zn17 or Th2Ni17 structures of the R2Fe17 parent compounds, but the unit cell volumes are 6%–7% greater, and the Curie temperatures …

The future of rare earth‐transition metal magnets of type RE2TM17 (invited) A brief review of the development of RE2TM17 permanent magnets is followed by a summary of the state‐of‐the‐art. Excellent magnetic properties have been achieved in the laboratory for single‐phase 2:17 and two‐phase, precipitation hardened magnets of ∼2:15 ...

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