Isomorphous Substitution of Rare-Earth Elements in ...

The substitution of rare-earth elements (REEs) for Pb in the lacunary apatite Pb8Na2(PO4)6 with void structural channels was studied by means of powder X-ray diffraction (including the Rietveld refinement), scanning electron microscopy, energy-dispersive X-ray microanalysis, and IR spectroscopy and …

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A Look at Rare Earth Metals and Their Applications

Rare earth metals are not considered a good physical investment like precious metals, which hold low-tech intrinsic value. Rare Earth Metals and Their Applications . In the periodic table of the elements, the third column lists the rare earth elements. The third row of the third column is expanded below the chart, listing the lanthanide series ...

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Magnetocaloric properties of rare-earth substituted DyCrO3 ...

This study investigates the possibility of tuning the magnetocaloric properties through the use of rare-earth substitution. Both Y 3+ and Ho 3+ substitutions were found to decrease the magnetocaloric response by disrupting the R 3+ ordering.

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Recycling and substitution of light rare earth elements ...

Historically, rare earth elements (REEs) were first studied, documented and named "rare earth" in 1794 by Juhan Gadolin, a Finnish Chemist at Åbo Akademi University (Turku) in Finland (Haskin and Frey, 1966).The modern research on REEs was pioneered by Schmitt and his colleagues in 1960 (Schmitt et al., 1960).REEs also known as rare earth metals or simply as rare earths, are defined as ...

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Zintl phase compounds AM2Sb2 (A=Ca, Sr, Ba, Eu, Yb; M=Zn ...

Effects of rare-earth substitution on the stability and electronic structure of REZnOSb (RE=La-Nd, Sm-Gd) investigated via first-principles calculations. Chem. Phys., 380 (2011), p. 54. Article Download PDF View Record in Scopus Google Scholar. 53. K Guo, ZY Man, XJ Wang, HH Chen, Tang, ZJ Zhang, Yu Grin, JT Zhao.

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(PDF) Effect of Rare Earth Substitution on Magnetic and ...

The substitution of rare earth ions in Mn–Zn ferrites increases the porosity and decreases the grain size. 2. The magnetization, the energy loss and the coercive field are increased for Mn–Zn ferrites substituted with R ¼ La only whereas these parameters are decreased for other substituted samples.

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Influence of B-site Gd+3 substitution on various ...

The effect of rare earth (Gd +3) substitution on various properties of nanocrystalline cobalt ferrite material with composition CoFe 2-x Gd x O (x = 0, 0.02, 0.04, 0.06, 0,08, 0.1) prepared using combustion method was investigated. The alterations produced in the structural parameters of the spinel lattice of cobalt ferrite were investigated using X-ray diffraction (XRD).

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RARE EARTH: WHY SUBSTITUTE? RECYCLE!

RARE EARTH: WHY SUBSTITUTE? RECYCLE! China's decision in 2010 to limit production and exportation of the rare earth metals on which a number of industries rely set off alarm bells among the country's trading partners. This was particularly true for the chemicals industry. The President of Rhodia Group's Rare Earth

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New alternatives may ease demand for scarce rare-earth ...

From computer hard discs and smart phones to earbuds and electric motors, magnets are at the forefront of today's technology. Magnets containing rare-earth …

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Impact of Tm3+ and Tb3+ Rare Earth Cations Substitution on ...

Moreover, a bimetallic substitution into NiCoFe 2 O 4 is scarcely explored. Herein, we introduced a rare earth Tb 3+ and Tm 3+ as (Co 0.5 Ni 0.5)[Tm x Tb x Fe 2−2x]O 4 via ultrasonic technique. The material is characterized and studied the magnetic behavior as a function of the concentration of rare-earth …

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Alternatives to Rare Earth Elements - Energy Stocks

Weaning the rare earth burden. It's no secret that China produces more than 95% of the world's rare earth elements. It's also no secret that China cut its export quotas by 72 percent in the second half of 2010 — then 35 percent for the first half of 2011. For those who need these rare earths, China's got 'em by the short hairs.

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The effect of rare-earth substitution on the Debye ...

It is assumed that the low substitution concentration of the rare-earth luminescent center does not significantly influence a material's Debye temperature. This work evaluates the validity of this approximation by examining the effect of luminescent center substitution on a host structure's Θ D. Two well-known phosphors, (Y 1– x Ce x) 3 Al 5 ...

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Rare earths sector at risk of more substitution if prices ...

LONDON, Oct 12 (Reuters) - The rare earth sector is likely to face more substitution unless production ramps up sharply to close a looming supply gap, …

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Substitution of diarylphosphoryl azides with aliphatic ...

A novel and high efficient protocol was disclosed herein for the rare-earth metal salt-catalyzed substitution of phosphoryl azides with amines. In this homogeneous catalysis system, different diarylphosphoryl azides and aliphatic and aromatic amines were evaluated under the optimized reaction conditions, ...

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Finite‐Temperature Properties of Rare‐Earth‐Substituted ...

Rare-earth substitution in the multiferroic BiFeO 3 (BFO) material holds promise for resolving drawbacks inherent to pure BFO, and for enhancing piezoelectric and magneto-electric properties via a control of structural and magnetic characteristics. Rare-earth-doped BFO solid solutions also exhibit unresolved features, such as the precise nature and atomic characteristics of some …

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Effect of rare-earth (Er and Gd) substitution on the ...

actions [19]. Hence, it can be concluded that the rare earth substitution does not influence the magnetic ordering due to Cr. There is a marginal, but non-negligible, decrease in T 2 for DEFCO, but the observed decrease is more dramatic for Gd substitution. Thus the observed trend in 2 does not follow T lanthanide contraction. The depression of T

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Rare-Earth Elements - USGS

Rare-Earth Elements. By Bradley S. Van Gosen, Philip L. Verplanck, Robert R. Seal II, Keith R. Long, and Joseph Gambogi Chapter O of. Critical Mineral Resources of the United States—Economic and

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Effects of rare earth ion substitution for Ca in (Bi,Pb ...

The increases in rare earth concentration induce excess oxygen incorporated between the Bi 2 O 2 double layers . Studies where rare earth elements substitute at the Ca site in the (Bi,Pb):2223 superconductor are scarce. In this paper we report the effect of the partial replacement of Ca by Y, Lu and Er in (Bi,Pb):2223. 2. Experimental

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Influence of rare-earth substitution on the structural ...

Influence of rare-earth substitution on the structural, magnetic, optical and dielectric properties of ZnO nanoparticles - Volume 4 Issue 11-12

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Influence of rare-earth substitution on the structural ...

Influence of rare-earth substitution on the structural, magnetic, optical and dielectric properties of ZnO nanoparticles. Ricardo Martínez 1, Claudia Zuluaga 1, Sandra Dussan 2, Hannu Huhtinen 3, Wojciech Jadwisienczak 4 & Ratnakar Palai 1 MRS Advances volume 4, pages 675–682 (2019)Cite this article

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Rare earths sector at risk of more substitution | Malaya ...

LONDON- The rare earth sector is likely to face more substitution unless production ramps up sharply to close a looming supply gap, an industry executive has warned. Demand for rare earth permanent magnets, key for electric vehicles (EVs) and wind turbines, is due to soar as governments and companies step up efforts to cut carbon […]

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Limiting Rare Earths Promote Substitution and Alternative ...

Emerson's Juan Carlos Bravo, a member of the metals and mining industry team, describes how rare earth metals may one day no longer be as rare as they currently are.. We have written in prior posts how rare earths are essential to our new way of life since they are used to manufacture essential electronic components that are in high demand. We also shared how in 2011, …

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Rare-earth (La3+) substitution induced changes in the ...

In particular, the substitution of rare-earth metal cation in CFO system produces a remarkable change in its magnetic behavior due to the variation in magnetic moment. To our knowledge, the effect of La doped on the structure, morphology, electric and magnetic properties for CFO was reported less with such large La 3+ content ( x = 0.7).

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Influence of B-site Gd substitution on various properties ...

Request PDF | Influence of B-site Gd substitution on various properties of Co-ferrite nanoparticles | The effect of rare earth (Gd⁺³) substitution on various properties of nanocrystalline ...

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Impact of Tm3+ and Tb3+ Rare Earth Cations Substitution on ...

Tm-Tb co-substituted Co-Ni nanospinel ferrites (NSFs) as (Co0.5Ni0.5) [TmxTbxFe2−2x]O4 (x = 0.00–0.05) NSFs were attained via the ultrasound irradiation technique. The phase identification and morphologies of the NSFs were explored using X-rays diffraction (XRD), selected area electron diffraction (SAED), and transmission and scanning electronic microscopes (TEM and SEM). The ...

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Effect of rare earth substitution in cobalt ferrite bulk ...

Effect of rare earth substitution in cobalt ferrite bulk materials. Bulai, G. (Faculty of Physics, Alexandru Ioan Cuza University of Iasi, Bd. Carol I, nr. 11, 700506 Iasi (Romania)); Diamandescu, L. (National Institute of Material Physics, P.O. Box MG-7, 07125 Bucharest (Romania)); Dumitru, I. (Faculty of Physics, Alexandru Ioan Cuza ...

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Impact of Tm3+ and Tb3+ Rare Earth Cations Substitution on ...

Impact of Tm3+ and Tb3+ Rare Earth Cations Substitution on the Structure and Magnetic Parameters of Co-Ni Nanospinel Ferrite. Nanomaterials. Ismail Ercan. Download PDF. Download Full PDF Package. This paper. A short summary of this paper. 37 Full PDFs related to …

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Rare earths sector at risk of more substitution if prices ...

The rare earth sector is likely to face more substitution unless production ramps up sharply to close a looming supply gap, an industry executive has …

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Effects of rare-earth substitution on the stability and ...

Rare-earth substitution. Stability. Electronic structure. Transport properties. 1. Introduction. Recently, more than 150 representative compounds with the ZrCuSiAs structure have been reported due to their outstanding properties in the fields of superconductivity, magnetism, transparent semiconductors and other potential applications, .

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(PDF) Effect of rare earth substitution in cobalt ferrite ...

The present work was focused on the effect of rare earth doping on the structural and magnetic properties of Ni-Co ferrite materials with general chemical formula Ni0.5Co0.5Fe1.98R0.02O4 (R = La ...

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Rare-earth mineral substitutes could defeat Chinese ...

Rare-earth elements are joined on the list by many other rare elements such as tungsten, platinum and indium. According to the British Geological Survey, China is …

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(PDF) Supply and Substitution Options for Selected ...

SUPPLY AND SUBSTITUTION OPTIONS FOR SELECTED CRITICAL RAW MATERIALS: COBALT, NIOBIUM, TUNGSTEN, YTTRIUM AND RARE EARTHS ELEMENTS Andreas Bartl *,1, Alan H. Tkaczyk 2, Alessia Amato 3, Francesca Beolchini 3, Vjaceslavs Lapkovskis 4 and Martina Petranikova 5 1 Vienna University of Technology, Institute of Chemical, Environmental & Bioscience Engineering, …

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The effect of rare-earth substitution on the Debye ...

The U.S. Department of Energy's Office of Scientific and Technical Information

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Analysis: Search for rare earth substitutes gathers pace ...

The pricing roller-coaster is a boon for rare earth substitute makers like Nanosys, which produces rare earth-free backlighting technology for monitors and handheld devices. Nanosys has a ...

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Rare earth substitution in lattice-tuned Sr0.3Ca0.7Fe2As2 ...

rare-earth-substituted CaFe2As2 [5,9,8], where the solubility limit of La is 30%, poses a challenge to understanding the reasons for a lack of bulk-phase superconductivity. One promising route is through the inclusion of higher concentrations of rare earth substitution. Previous studies of La substitution into the SrFe2As2 system [10], with Tc ...

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(PDF) Structure of rare-earth chalcogenide glasses by ...

Sαβ (Q ) is related to the partial pair-distribution morphic substitution (NDIS) of the rare-earth element [49–54] function gαβ (r ) by the Fourier transform relation was employed to measure the structure of the rare-earth glasses (R2X3)0.07(Ga2X3)0.33(GeX2)0.60, with R = La or Ce and X = S 1 ∞ or Se.

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Rare earths sector at risk of more substitution if prices ...

Rare earths sector at risk of more substitution if prices spike. LONDON, Oct 12 (Reuters) - The rare earth sector is likely to face more substitution unless production ramps up sharply to close a looming supply gap, an industry executive has warned. Demand for rare earth permanent magnets, key for electric vehicles (EVs) and wind turbines, is ...

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Scientists Propose Alternatives To Rare Earth Elements ...

The term "rare earth element" has a specific meaning to scientists. Most people focus on the word "rare" and assume it means the 17 so-called rare earth elements are just that — rare. In ...

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Chemical pressure exerted by rare earth substitution in ...

Substitution of rare-earth (RE) ions at A-site of BFO was proposed as a promising approach to (i) suppress the formation of secondary phases, (ii) manipulate magnetic response (by perturbing the spatially modulated cycloid spin structure), (iii) reduce leakage current and (iv) induce phase transition. However, a complete study where all rare ...

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