Abstract. 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 ...

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 ...

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.

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 ...

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.

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, …

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 ...

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 …

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 …

The ion-adsorption type rare earth ore is an unconsolidated bed of clay minerals. Column leaching, heap leaching and in situ leaching are used in the industrial practice [].Nowadays, rare earth is recovered by in situ leaching process with (NH 4) 2 SO 4 solution in the industry and precipitated with ammonium bicarbonate. However, there …

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 …

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 ...

In contrast, the rare earth carbonates precipitated with sodium carbonate presented a comparatively lower REO content (68.5% w/w) and 94.2% of purity, but with a higher content of impurities.

The high-temperature creep resistance in Al2O3 is highly improved by the rare-earth oxide doping in the level of 0.045 mol %, and the creep rate is suppressed in the order La2O3

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 …

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 …

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 [ …

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 …

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 …

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 ...

The theory of rare-earth impurities in semiconductors is reviewed. Results of Green's function calculations are presented. The particular case of Ytterbium (Yb) in InP is analyzed in detail. We show that the optical transitions of Yb in InP and their Zeeman splitting can be interpreted by a small coupling between quasi degenerate 5d and 4f states. It also …

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 ...

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 ...

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 ...

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 …

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 …

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 ...

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 determination.

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 over …

DOI: 10.1103/PHYSREVLETT.3.30 Corpus ID: 119690310; Effects of Rare Earth Impurities on Ferrimagnetic Resonance in Yttrium Iron Garnet @article{Dillon1959EffectsOR, title={Effects of Rare Earth Impurities on Ferrimagnetic Resonance in Yttrium Iron Garnet}, author={J. F. Jun. Dillon and J. W. Nielsen}, journal={Physical Review Letters}, …