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Tesis sobre el tema "Rare earth metals"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 25 de julio de 2025

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1

Dhesi, Sarnjett Singh. "Surface structure of rare-earth metals." Thesis, University of Liverpool, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.333635.

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2

Harika, Rita 1979. "Advances in rare earth chemistry." Monash University, School of Chemistry, 2003. http://arrow.monash.edu.au/hdl/1959.1/5545.

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3

Jehan, David Antony. "Magnetic structures in rare earth metals and superlattices." Thesis, University of Oxford, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.357569.

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4

Lozano, Letellier Alba. "Geochemistry of rare earth elements in acid mine drainage precipitates." Doctoral thesis, Universitat de Barcelona, 2019. http://hdl.handle.net/10803/668458.

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Rare earth elements (REE) are known as the lanthanide series (La-Lu) plus yttrium (Y) and scandium (Sc). REE are essential materials for modern industries and especially for green technologies (wind turbines, batteries, lasers, catalysts, etc.). However, despite their high global demand, their supply is limited such that the EU has cataloged it as critical raw materials. In order to ensure the supply of REE in the future, the search for alternative sources of these elements worldwide has been promoted in recent years. Acid mine drainage (AMD) produced by the Fe-sulphide weathering can effecti

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5

Johnson, Kevin Ross David. "An investigation of novel reactivity and bonding in rare earth metal complexes." Thesis, Lethbridge, Alta. : University of Lethbridge, Dept. of Chemistry and Biochemistry, c2012, 2012. http://hdl.handle.net/10133/3329.

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The synthesis, structure and reactivity of organolanthanide complexes supported by a family of novel bis(phosphinimine)carbazole and bis(phosphinimine)pyrrole pincer ligands is presented. Through the systematic development of the ligand frameworks, rare earth metal species with unique structure and reactivity were encountered. A variety of complexes that exhibited unusual bonding modes were prepared and characterized by single-crystal X-ray diffraction and multinuclear NMR spectroscopy. Modulation of the ligand frameworks allowed for rational manipulation of the steric and electronic environme

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6

Steinberg, Simon [Verfasser]. "Early Rare-Earth Metal Cluster Complexes With Endohedral Transition Metals / Simon Steinberg." München : Verlag Dr. Hut, 2013. http://d-nb.info/1042307504/34.

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7

Blyth, Robert I. R. "Bulk and surface electronic structure of rare earth metals." Thesis, University of Liverpool, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.316767.

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The basic properties of the rare earth metals, including single crystal growth, crystal and magnetic structures, and the relationship between electronic and magnetic structure, are reviewed. The problems encountered by the theoretical treatment of the partially occupied, but highly localised, lanthanide 4f levels as bands are discussed, and bandstructure calculations presented for the hexagonal close-packed rare earths. These are compared with available experimental and theoretical data. It is suggested that the exchange-splitting of the lanthanide valence bands may well persist in the paramag

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8

Hoh, Soon Wen. "Oxidation catalysis using transition metals and rare earth oxides." Thesis, Cardiff University, 2014. http://orca.cf.ac.uk/69756/.

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Oxygen abstraction together with CO adsorption and oxidation over palladium/platinum-doped cerium (IV) oxide and gold catalyst supported on iron (III) oxide were studied employing density functional theory with the inclusion of on-site Coulomb interaction (DFT+U). Hybrid functionals employing DFT method are able to re-produce structural properties for CeO2 that agrees well with experimental data. The localisation of two excess electrons upon the removal of an oxygen atom from the CeO2 lattice is well described by DFT+U and is found to be most favourable on two next nearest neighbour cerium sit

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9

Ellerby, Mark. "Resistance and magnetization study of rare earth metals and compounds." Thesis, Birkbeck (University of London), 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.336406.

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10

Kramer, Mathias. "Cationic alkyl and hydride complexes of the rare earth metals." Aachen Shaker, 2009. http://d-nb.info/998740497/04.

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11

Coetzee, Louis-Charl Cloete. "A study of lanthanide complexes with di-2-pyridyl ligands." Thesis, Nelson Mandela Metropolitan University, 2016. http://hdl.handle.net/10948/4731.

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The ligands di(2-pyridyl) ketone (DPK) and cis-1,2 di(2-pyridyl) ethylene (DPE) are N,N,Odonor ligands that can undergo nucleophilic addition and become more flexible for coordination. The reaction between the lanthanide thiocyanate salt and DPK gave rise to seven novel complexes of the general formula [Ln(NCS)3(DPKOH)3], where Ln = La, Ce, Nd, Eu, Tb, Dy and Ho. 1H NMR spectroscopy verified that the ligand underwent nucleophilic addition upon coordination. This was further confirmed using UV-Vis spectroscopy which showed a shift in the absorption bands due to conjugation of electrons within t

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12

Madanhire, Tatenda. "Synthesis and characterisation of lanthanide complexes with nitrogen- and oxygen-donor ligands." Thesis, Nelson Mandela Metropolitan University, 2016. http://hdl.handle.net/10948/13127.

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The reactions of Ln(NO3)3∙6H2O (Ln = Pr, Nd or Er) with the potentially tridentate O,N,O chelating ligand 2,6-pyridinedimethanol (H2pydm) were investigated, and complexes with the formula, [Ln(H2pydm)2(NO3)2](NO3) (Ln = Pr or Nd) and [Er(H2pydm)3](NO3)3 were isolated. The ten-coordinate Pr(III) and Nd(III) compounds crystallise in the triclinic space group P-1 while the nine-coordinate Er(III) complex crystallises in the monoclinic system (P21/n). The reaction of PrCl3∙6H2O with H2pydm yielded the compound, [Pr(H2pydm)3](Cl)3, that crystallises in the monoclinic system, space group P21/c with

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13

Vikström, Hanna. "Rare Metals: Energy Security and Supply." Thesis, Uppsala universitet, Institutionen för fysik och astronomi, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-168130.

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Lithium and neodymium are two critical materials in our modern society, many technological solutions depend on them. Lithium is used in batteries, which are used in cars and portable electronics. Neodymium, which is a rare earth element, is mainly used in permanent magnets which are used in smartphones, hard disc drives and turbines. There are many reports regarding the availability of the metals, with different results. The available data on the reserves varies considerably, from the few sources there are. In this report, based on geological availability, forecasts are done to investigate how

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14

Webb, Helen Rachael 1975. "Interaction of the rare earth ions with p-sulfonatocalix[4]arene and 18-crown-6." Monash University, Dept. of Chemistry, 2001. http://arrow.monash.edu.au/hdl/1959.1/9076.

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15

Shah, N. J. "Hyperfine interactions in amorphous and crystalline alloys containing rare earth metals." Thesis, University of Manchester, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.377743.

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16

Tobash, Paul H. "Synthesis, structure, bonding, and physical properties of novel binary and ternary rare-earth metal germanides." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 514 p, 2009. http://proquest.umi.com/pqdweb?did=1833646491&sid=11&Fmt=2&clientId=8331&RQT=309&VName=PQD.

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17

Dai, Lixiong. "Structural modifications to optimise lanthanide luminescence." HKBU Institutional Repository, 2017. http://repository.hkbu.edu.hk/etd_oa/403.

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Luminescent lanthanide coordination complexes have attracted significant attention due to their unique optical properties. The poor absorption of a lanthanide ion can be resolved by so-called antenna effect and improve the intensity of its luminescence. Three bidentate chromophores: phosphate-pyridine chromophore, 1,2-Hydroxy pyridone (1,2-HOPO) and 2-thenoyltrifluoroacetone (TTA), functioned as both chelator and sensitizer, their energy levels are well matched with the excited state energy levels of the Eu(III) and Sm(III).. To get highly luminescent and stable lanthanide complex, we designed

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18

Mkwakwi, Kwakhanya. "Synthesis and characterisation of lanthanide complexes with O,O-donor ligands: towards a new generation of hydrophosphonylation catalysts." Thesis, Nelson Mandela Metropolitan University, 2017. http://hdl.handle.net/10948/11986.

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This study investigates the coordination behaviour of potentially bi- and tridentate O,O- and O,N,O-donor Schiff base ligands with trivalent lanthanide ions. The reactions of lanthanide nitrates with 2-((E)-(tert-butylimino)methyl)-6-methoxyphenol (HL1) have yielded five complexes that are described by the general formula [Ln(HL1)2(NO3)3] (Ln = Ce, Nd, Gd, Ho and Er) and were characterised using physico-chemical techniques including single-crystal X-ray diffraction spectroscopy. The cerium complex crystallised in a triclinic (P-1) space group, while the rest of the complexes crystallised in th

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19

Jin, Geng Bang. "Synthesis and characterization of new Lanthanide chalcogenides." Auburn, Ala., 2007. http://repo.lib.auburn.edu/07M%20Dissertations/JIN_GENGBANG_37.pdf.

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20

Aggarwal, Jugdeep K. "The mobility of trace elements and boron isotopes in Icelandic hydrothermal systems." Thesis, University of Bristol, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.294571.

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21

Bao, Guochen. "The study of photophysical properties of organic-lanthanide hybrid materials and their applications." HKBU Institutional Repository, 2020. https://repository.hkbu.edu.hk/etd_oa/773.

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Designing hybrid materials allows leveraging the properties of different material systems to achieve novel functions. Significant progress has been made in recent years to exploit the physicochemical properties of a new generation of hybrid materials for emerging biomedical applications. In Chapter 1, I review the recent advances in the field of dye-lanthanide hybrid materials, centring on the interface between organic dyes and inorganic lanthanide materials and investigating their photophysical and photochemical properties. Five representative dye-lanthanide hybrid material systems including

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22

Zhang, Lilu. "Synthesis and chemistry of lanthanide complexes with phosphorus ylides, amides or porphyrinate ligands, and of transition metal complexes with polydentate ligands." HKBU Institutional Repository, 1999. http://repository.hkbu.edu.hk/etd_ra/182.

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23

Lambidis, Elisavet. "Synthesis and photophysical studies of metal complexes for biological applications /Lambidis Elisavet." HKBU Institutional Repository, 2017. http://repository.hkbu.edu.hk/etd_oa/346.

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Nowadays the necessity for designing and synthesizing novel imaging agents increases rapidly. The long wavelength, and thus, low energy, of excitation and emission, and the good specificity and stability are examples of essential characteristics of ideal diagnostic and therapeutic agents. In this work, the synthesis and photophysical studies of metal complexes for biological applications were performed and evaluated, and it contained the development of (a) a porphyrin probe for imaging and treatment and (b) a tripodal thermal sensor for imaging. The research and study of the two cases of compl

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24

Luo, Haihua. "Synthesis and characterization of rare-earth-iron based hard magnetic materials /." free to MU campus, to others for purchase, 1998. http://wwwlib.umi.com/cr/mo/fullcit?p9924902.

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25

Krupin, Oleg. "Dichroism and Rashba effect at magnetic crystal surfaces of rare earth metals." [S.l. : s.n.], 2004. http://www.diss.fu-berlin.de/2004/249/index.html.

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26

Robinson, Katie Jane. "Electrochemical studies of rare earth and transition metals in molten NaCl-KCl." Thesis, Imperial College London, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.296988.

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27

Zarychta, Bernard. "Theory of resonant x-ray scattering in the heavy rare earth metals." Thesis, Keele University, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.486008.

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The basic structural &magnetic properties of rare earth ions and metals are discussed.A theory of the electronic structure of rare earth ions is introduced using Self Interaction Corrected Relativistic Spin polarised Density FUnctional Theory (SIC-R-SP-DFT). The ~rystal environment is modelled using the Linear Muffin Tin Orbital (LMTO) method. X-ray scattering from a single electron is discussed using covariant perturbation theory and is then elaborated on for the SIC-R-SP-LMTO environment. The details of the xray scattering calcul~tions are considered. Results for x-ray scattering from the he

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28

張志成 and Chi-shing Samuel Cheung. "Ni and rare-earth metals in-diffusion in LiNbO3 for waveguide application." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1998. http://hub.hku.hk/bib/B31215117.

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29

Kramer, Mathias [Verfasser]. "Cationic Alkyl and Hydride Complexes of the Rare-Earth Metals / Mathias Kramer." Aachen : Shaker, 2009. http://d-nb.info/1161300929/34.

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30

Struckmann, Mona [Verfasser]. "Reactions of Rare Earth and transition metals under harsh conditions / Mona Struckmann." Gießen : Universitätsbibliothek, 2018. http://d-nb.info/116957095X/34.

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31

Cheung, Chi-shing Samuel. "Ni and rare-earth metals in-diffusion in LiNbO3 for waveguide application /." Hong Kong : University of Hong Kong, 1998. http://sunzi.lib.hku.hk/hkuto/record.jsp?B19982094.

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32

Lim, Chee Ming. "Automated ultrasound studies of magnetoelastic effects in rare earth metals and alloys." Thesis, University of Warwick, 1998. http://wrap.warwick.ac.uk/91220/.

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Ultrasound studies of single crystals of Er, Tm and alloys of Er-Tm were carried out as a function of temperature (4.2 - 300 K) and applied magnetic field (0 – 5 T). The elastic constants of these materials were measured and anomalies in the elastic constants were observed. The ultrasound data were compared with reported results from other material characterisation techniques and the magnetic phases and transition temperatures of the materials were then identified. The effects of the application of magnetic field on the magnetic ordering of the materials were studied using the ultrasound metho

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33

Yilmaz, Serkan. "Optimization Of Conditions Of Metallothermic Reduction Of Rare Earth Preconcentrates." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12608189/index.pdf.

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Rare earth ferrosilicon alloy is an important additive for ferrous metallurgy. It is mainly used to control the detrimental effects of sulfur in steel and to modify graphite structures in cast iron. The aim of this study was to optimize the conditions for the production of rare earth ferrosilicon alloy by metallothermic reduction process using a preconcentrate prepared from a bastnasite type of ore present in the Beylikahir-EskiSehir region of Turkey. In this study, the rare earth preconcentrate was reduced by aluminum together with ferrosilicon and rare earth ferrosilicon alloys were produc

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34

Hopkinson, David Mark. "Reducing rare earth consumption in Nd₂Fe₁₄B magnets through controlled nanostructures." Thesis, University of Cambridge, 2015. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.708723.

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35

Jones, Daniel M. "A convergent beam electron diffraction study of some rare-earth perovskite oxides /." Connect to this title, 2007. http://theses.library.uwa.edu.au/adt-WU2008.0057.

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36

Guerra, Renan Barrach [UNESP]. "Síntese, caracterização e avaliação da atividade biológica de metalofármacos de sulindaco com íons lantanídeos (III) no estado sólido." Universidade Estadual Paulista (UNESP), 2015. http://hdl.handle.net/11449/132603.

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Made available in DSpace on 2016-01-13T13:27:18Z (GMT). No. of bitstreams: 0 Previous issue date: 2015-07-28. Added 1 bitstream(s) on 2016-01-13T13:32:38Z : No. of bitstreams: 1 000855142.pdf: 2602801 bytes, checksum: 3d3b585e85a9cfc362e0b0d136af6d71 (MD5)<br>Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)<br>A síntese e caracterização de complexos do fármaco anti-inflamatório não esteroide sulindaco (sulin) com os íons lantanídeos (Ln3+) La3+, Ce3+, Pr3+, Nd3+, Gd3+, Tb3+ e Ho3+ no estado sólido são descritas neste trabalho. A caracterização dos complexos foi realizada emprega

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37

Guerra, Renan Barrach. "Síntese, caracterização e avaliação da atividade biológica de metalofármacos de sulindaco com íons lantanídeos (III) no estado sólido /." Bauru, 2015. http://hdl.handle.net/11449/132603.

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Orientador: Gilbert Bannach<br>Banca: Eder Tadeu Gomes Cavalheiro<br>Banca: Flavio Junior Caires<br>O Programa de Pós Graduação em Ciência e Tecnologia de Materiais, PosMat, tem caráter institucional e integra as atividades de pesquisa em materiais de diversos campi<br>Resumo: A síntese e caracterização de complexos do fármaco anti-inflamatório não esteroide sulindaco (sulin) com os íons lantanídeos (Ln3+) La3+, Ce3+, Pr3+, Nd3+, Gd3+, Tb3+ e Ho3+ no estado sólido são descritas neste trabalho. A caracterização dos complexos foi realizada empregando a termogravimetria-calorimetria exploratória

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38

Zhou, Yan. "Synthesis, photophysical and biological studies of lanthanide complexes for photodynamic therapy." HKBU Institutional Repository, 2017. https://repository.hkbu.edu.hk/etd_oa/467.

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1.2\xPrior to the PDT, we have also synthesized a series of water-soluble homoleptic lanthanides (Ln3+ = Gd, Er, and Yb) sandwich (DD) di-PEGylated porphyrin complexes. The Yb complex (YbDD) has shown the same NIR emission quantum yield as the highest record Yb complex in the literature (Yb-RhB), yet, the emission intensity is double compared to the Yb-N. This implies a new thinking about the quantity measurement for biological imaging. The brightness might be the prime factor for the development of luminescence in vitro/in vivo imaging agent rather than the emission quantum yield.

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39

Wong, Ka-Leung. "Synthesis, characterization, and photophysical studies of organic-lanthanide complexes." Click to view the E-thesis via HKUTO, 2006. http://sunzi.lib.hku.hk/hkuto/record/B36875351.

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40

Mathur, Neil David. "Quantum order in heavy fermion systems." Thesis, University of Cambridge, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.388485.

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41

Luo, Yuxia. "The study of energy transfer and local field effect in lanthanide complexes with high and low symmetry." HKBU Institutional Repository, 2019. https://repository.hkbu.edu.hk/etd_oa/696.

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There are lots of important applications for lanthanides (Ln) because of their unique properties. The properties are closely linked to the environment of the crystal field. Thus, two kind of crystals Cs2NaLn(NO2)6 with high Th point-group symmetry and LnPO4 with monoclinic symmetry were chosen to study quantum cutting and Stokes shift. Quantum cutting is a kind of down-conversion energy transfer in which one excitation ultraviolet photon is transformed into multiple near infrared photons. This phenomenon has been studied in Cs2NaY0.96Yb0.04(NO2)6. The emission from Yb3+ can be excited via the

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42

Jones, Daniel M. "A convergent beam electron diffraction study of some rare-earth perovskite oxides." University of Western Australia. School of Physics, 2008. http://theses.library.uwa.edu.au/adt-WU2008.0057.

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This work describes detailed convergent beam electron diffraction (CBED) studies of GdAlO3 and LaAlO3 perovskites. CBED patterns tilted away from major zone axes have been found to have high sensitivity to the presence of mirror or glide mirror symmetry. Such patterns confirm to high accuracy that the space group of GdAlO3 is orthorhombic, Pnma. Tilted patterns from this well characterised structure also serve as benchmarks against which similar patterns may be compared. In the case of LaAlO3, tilted patterns enable the space group to be confirmed as rhombohedral R3c, previously claimed to be

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43

Saleh, Liban Mohamoud Ali. "Rare earth metal boryl and gallyl compounds : synthesis and reactivity." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:b511fe23-8b79-47b5-9ac6-dcfd52c58239.

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This Thesis describes the syntheses, characterisation and reactivity of rare earth metal boryl and gallyl compounds. Experimental and computational studies were performed to investigate the structure and bonding in these compounds. <b>Chapter 1</b> introduces key metal-boryl and metal-gallyl compounds of the s, p, d and f-blocks via literature review. <b>Chapter 2</b> describes the syntheses, structures and bonding analyses of rare earth metal boryl compounds. A short introduction to rare earth metal cations is given. Chapter 3</b> describes the syntheses, structures and bonding analyses of ra

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44

Eames, Christopher. "LEED and ab initio study of rare earth metals on silicon and germanium." Thesis, University of York, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.437561.

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45

Clark, Candyce. "Polynuclear biomolecular-supported rare earth coordination compounds : towards a new generation of lanthanide-based drugs." Thesis, Nelson Mandela Metropolitan University, 2014. http://hdl.handle.net/10948/d1020778.

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Galactitol and cis,cis,cis-1,3,5-cyclohexanetriol are polyols that are ideal examples of model compounds for ligands with lanthanide ions as they have their hydroxyl groups in favourable steric arrangement. Several complexes were synthesised with both lanthanide chloride and lanthanide nitrate salts with galactitol, and a variety of structures, both polymeric and monomeric, were observed. In all these complexes, galactitol acted as a bridging molecule between the lanthanide ions. A notable difference was the lanthanum chloride–galactitol complex that showed both chloride and galactitol bridgin

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46

Thiagarajan, Suraj Joottu. "Thermoelectric properties of rare-earth lead selenide alloys and lead chalcogenide nanocomposites." Columbus, Ohio : Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1196263620.

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47

Oliveira, Robson Caldas de [UNESP]. "Biossorção de terras-raras por Sargassum sp: estudos preliminares sobre as interações metal-biomassa e a potencial aplicação do processo para a concentração , recuperação e separação de metais de alto valor agregado em colunas empacotadas." Universidade Estadual Paulista (UNESP), 2011. http://hdl.handle.net/11449/100743.

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Made available in DSpace on 2014-06-11T19:31:00Z (GMT). No. of bitstreams: 0 Previous issue date: 2011-03-25Bitstream added on 2014-06-13T21:01:53Z : No. of bitstreams: 1 oliveira_rc_dr_araiq.pdf: 2354887 bytes, checksum: 89c5b192793995d9542d4827f06031b1 (MD5)<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)<br>O processo de biossorção tem sido reconhecido como alternativa potencial na concentração de metais pesados e radioisótopos a partir de corpos d’água que recebem ação antropogênica (indústria, mineração, etc.). A biossorção é um processo que se baseia na remoção d

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48

Weber, Peter. "Spin dependent transport and magnetic ordering in rare earth metals infrared spectroscopy on holmium /." [S.l. : s.n.], 2004. http://www.bsz-bw.de/cgi-bin/xvms.cgi?SWB11293366.

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49

Rangavittal, Bharath Vasudev. "Optimization of Rare Earth Metals (REM) addition in high temperature stainless steel grade 253MA." Thesis, KTH, Materialvetenskap, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-257206.

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The focus of this thesis work is to optimize rare earth metal (REM) addition in Therma 253MA, an austenitic stainless-steel grade in order to get a good trade-off between oxidation resistance property and the amount of big REM inclusions formed. Big REM inclusions are detrimental to material properties and REM is required to be dissolved in the matrix for improving the oxidation resistance. REM optimization can also lead to economical savings for Outokumpu. The distribution of REM between matrix and inclusion is affected by factors such as REM addition, initial oxygen and sulphur contents and

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Dyer, Hellen Elizabeth. "New lanthanide complexes as polymerisation catalysts." Thesis, University of Oxford, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.560913.

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This Thesis describes the synthesis and characterisation of a series ofbisphenolate supported samarium borohydride, amide and zwitterionic rare earth complexes and their ability to effect the ring opening polymerisation (ROP) of cyclic esters and methylmethacrylate (MMA). Chapter 1 introduces ROP from both an industrial and an academic perspective and describes in detail the research in this area, with emphasis on rare earth initiators. The lanthanide elements and the bisphenolate ligand are also introduced. Chapter 2 describes the synthesis and characterisation ofbisphenolate supported samari

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