rare earth impurities

In general, the spectral interference between trace REEs impurities can be ignored [14].However, the REO(H) + interference induced by the matrix (light REE) on the determination of trace heavy rare earth impurities in light rare earth oxide matrix was reported and should be carefully considered [14], [15], especially for those light REEs …

Selective catalytic reduction (SCR) is still the most widely used process for controlling NOx gas pollution. Specifically, commercial vanadium-based catalysts have problems such as narrow operating …

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 ...

Therefore, the main effect of the impurity removal, or rare earth recovery can be determined according to the coefficient. In general, the optimization of the two precipitants were similar in the precipitation. The pH coefficient is significantly higher than those of the other regression items, and is the key factor affecting the E 1 and E 2 by ...

Impurities such as Si, Fe, Al, Mo, Ti were mostly from rare earth oxide and reagent materials. Total concentration of impurities in rare earth metals could be …

Damping by Slow Relaxing Rare Earth Impurities in Ni80 Fe20. G. Woltersdorf, M. Kiessling, G. Meyer, J.-U. Thiele, and C. H. Back. Phys. Rev. Lett. 102, 257602 – …

As presented in Fig. 2, the Chinese controlled 97% of all rare earth oxide (REO) production in the world at the time and brought about a severe rare earth crisis for the rest of the. Methodology. The present review aims to systematically review recent progress in impurity removal during REE processing and to identify best practices for …

The problems with impurities, particularly Ca in rare earth oxide powders, have been discussed above. Therefore all three diagrams may reflect a true situation: Fig. 6 a for the impurity laden system, Fig. 6 b for the Y- (Y/Yb-, Y/Lu-) system with Ca concentrations too small for the stabilisation of oxyapatite and Fig. 6 c for the Yb- and ...

A new technique for the selective separation of rare earth oxides and impurities from lower grade titaniferous ores has been developed. The process includes roasting the ore with alkali followed ...

It is worthwhile to note that, in this review, extraction of rare earth elements is construed to encompass processes or practices that dislodge or abstract REE's from …

Investigations of impurity centers, electrical resistivity and microstructure of BaTiO3 ceramics doped with rare-earth ions Y, La, Nd, Sm, Dy and Lu at concentrations x = 0.001–0.005 were ...

We performed a first principles investigation on the electronic properties of 4f-rare earth substitutional impurities in zincblende gallium nitride (GaN:REGa, with RE = Eu, Gd, Tb, Dy, Ho, Er and Tm). The calculations were performed within the all electron methodology and the density functional theory. We investigated how the introduction of ...

Doping Ni80Fe20 by heavy rare earth atoms alters the magnetic relaxation properties of this material drastically and it is shown that this effect can be well explained by the slow relaxing impurity mechanism. Doping Ni80Fe20 by heavy rare earth atoms alters the magnetic relaxation properties of this material drastically. We show that this effect …

PDF | The absorption spectra of LaF3 crystals, both pure and doped with rare-earth fluorides (YF3, CeF3, NdF3, PrF3, SmF3, EuF3, GdF3, TbF3, DyF3, HoF3,... | Find, read and cite all the research ...

Besides rare earth impurities, an important role in the purity of REE-based materials is taken by non-rare-earth impurities (NREIs). For example, in the manufacture of phosphors and optical ceramics, high-purity rare earth oxides are used, and critical impurities are colored ions Fe, Ni, Cr, Co, Cu, V, Mn, etc., as well as some lanthanides [ …

A method was developed for the determination of rare earth impurities in high purity Gd 2 O 3 by inductively coupled plasma mass spectrometry (ICP-MS). The matrix suppression effect of Gd 2 O 3 on signals of rare earth impurities was compensated for by Re internal standardization. The spectra overlap interferences from GdH, GdO, …

1. Introduction. Neodymium (Nd) is an important element in astronavigation, clean energy and electronic industries. 1 With applications in these specialized areas increasing, high-purity Nd has been commonly required. For example, the product of Nd 2 O 3 applied in batteries and semiconductor laser requires that the content of RE (rare …

The impurity elements to be analysed as typical non-rare earth impurities are the following five elements: Magnesium (Mg), Aluminum (Al), Silicon (Si), Calcium (Ca) and Iron (Fe). The specified measurement ranges for these impurities are shown in Table 1. An instrument capable of the achieving the below ranges is required for this …

Introduction. Neodymium (Nd) is an important element in astronavigation, clean energy and electronic industries. 1 With applications in these specialized areas increasing, high-purity Nd has been commonly required. For example, the product of Nd 2 O 3 applied in batteries and semiconductor laser requires that the content of RE (rare …

In order to analyze trace rare earth impurities in ThF 4, two effective analytical methods based on the matrix-matched strategy using ICP-MS with different sample pretreatment procedures are developed in this study.The first procedure involves the conversion of ThF 4 into ThO 2 by pyrohydrolysis and the subsequent dissolution of …

The method to calculate crystal field parameters was successfully applied to rare earth impurities in LaF 3, showing its applicability to R on sites with an arbitrary local symmetry. Despite the ionic character of the compound the R ( 4 f) - F ( 2 p, 2 s) hybridization plays a significant role.

With the increasing demand of rare earth metals in functional materials, recovery of rare earth elements (REEs) from secondary resources has become …

irect etermination of Rare Earth Impurities in High-Purity Terbium Oxide with the NexION 1100 ICP-MS Figure 2. BEC of 10 µg/L Lu in 500 ppm Tb 4O 7 solution with different NH 3 gas flow. Figure 3. AFT optimization curve of 10 µg/L Lu in 500 ppm Tb4O 7 solution with RPq = 0.45 and NH 3 = 3 mL/min. An important cell parameter in the ...

F. Hartmann‐Boutron; Effect of Rare‐Earth Impurities on the Ferrimagnetic Resonance and Nuclear Relaxation in Yttrium Iron Garnet. Journal of Applied Physics 1 March 1964; 35 (3): ... Then making the slow relaxation hypothesis, we rigorously calculate the susceptibilities of the rare‐earth ions and deduce that, in order to be successful ...

Semantic Scholar extracted view of "Determination of rare earth impurities in high purity gadolinium oxide by inductively coupled plasma mass spectrometry after 2-ethylhexylhydrogen-ethylhexy phosphonate extraction chromatographic separation." by …

sources of metallic impurities and interstitial impurities in rare earth metals as well as the action mechanism of reducing the concentration of di erent 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.

Impurity doping often alters or improves the properties of materials. In alumina, grain boundaries play a key role in deformation mechanisms, particularly in the phenomenon of grain boundary sliding during creep at high temperatures. We elucidated the atomic-scale structure in alumina grain boundaries and its relationship to the suppression of creep …

Impurity doping often alters or improves the properties of materials. In alumina, grain boundaries play a key role in deformation mechanisms, particularly in the phenomenon of grain boundary sliding during creep at high temperatures. We elucidated …

spectrum of trace impurities in high purity gadolinia. The. irradiated gadolinia was dissolved in concentrated HCl in. a 25 mL conical flask. The solution was heated to dryness. and re-dissolved ...

Grain Boundary Strengthening in Alumina by Rare Earth Impurities. J. Buban, K. Matsunaga, +4 authors. Y. Ikuhara. Published in Science 13 January 2006. …

This purification aims at reducing the concentration of impurities such as Fe 3+, Al 3+, PO 4 3− and UO 2 2+ in order to allow the production of marketable rare earth products, such as rare earth oxides or carbonates. Moreover, this purification is performed avoiding as much as possible any REEs losses, since this has a negative impact on the ...

Doping Ni 80Fe20 by heavy rare earth atoms alters the magnetic relaxation properties of this. material drastically. W e show that this effect can be well explained by the slow relaxing impurity ...

We report measurements of the magnetoresistance of gold containing rare-earth impurities in longitudinal and transverse magnetic fields. For rare-earths with orbital magnetism the dominant effect ...

The ability of rare-earth elements (REEs) to bind oxygen impurities in Ge 20 Te 80 and Ga 10 Ge 15 Te 75 telluride glasses is studied. Thermodynamic calculations and experiments show that REEs in glasses, with the exception of Eu, can significantly reduce the content of oxygen impurities chemically bound with germanium, tellurium, and gallium.

It is found that the yttrium segregates to very localized regions along the grain boundary and alters the local bonding environment, thereby strengthening the boundary against mechanical creep. Impurity doping often alters or improves the properties of materials. In alumina, grain boundaries play a key role in deformation mechanisms, …

The absorption spectra of LaF3 crystals, both pure and doped with rare-earth fluorides (YF3, CeF3, NdF3, PrF3, SmF3, EuF3, GdF3, TbF3, DyF3, HoF3, ErF3, TmF3, YbF3, and LuF3) have been investigated. All these impurities can be separated into two groups with respect to the shape of the absorption spectra of irradiated crystals. The …