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Dissertations / Theses on the topic 'Chalcogenides. Rare earth metals'

Author: Grafiati

Published: 4 June 2021

Last updated: 14 February 2022

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1

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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2

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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3

Magliocchi, Carmela Luisa. "Synthesis, structure and characterization of molybdenum and rare earth chalcogenides." Diss., Texas A&M University, 2004. http://hdl.handle.net/1969.1/348.

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This dissertation focuses on the synthetic exploratory synthesis of molybdenum chalcogenides and rare earth metal-rich ternary tellurides as a part of an effort to produce molecular building blocks of molybdenum chalcogenide clusters and to explore their structural relationships with solid state cluster networks. The tightly cross-linked Mo3nSe3n+2(n = 2, 3, ...∞) clusters and chain compounds react with alkali metal cyanide or cyanide salt mixtures at temperatures of 450-675 °C to yield reduced, cyanide-terminated molybdenum chalcogenide clusters that are thermodynamically stable. At temperat

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4

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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5

Barrett, Emma. "Photoluminescence in rare earth activated oxides and II-VI chalcogenides." Thesis, University of Greenwich, 2007. http://gala.gre.ac.uk/8391/.

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This thesis is concerned with the luminescent properties Â·of rare earth doped oxides and the IT-VI chalcogenide CaCdS. Both materials are luminescent by very different mechanisms. Luminescence from CaCdS is due to transitions between the conduction and valence band. Emission spectra were found to be much sharper than in previously reported work. The narrowness of the peak appears to coincide with a reduction in particle size. With increasing cadmium concentration, this short wavelength (370 nm) emission band became distorted in symmetry and exhibited a red shift. This was seen as being indica

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6

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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7

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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8

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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9

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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10

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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11

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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12

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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13

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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14

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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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

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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17

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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18

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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19

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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20

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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21

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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22

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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23

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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24

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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25

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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26

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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27

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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28

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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29

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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30

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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31

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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32

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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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

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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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

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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37

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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38

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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39

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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40

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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41

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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42

Brown, TJ. "Geology & Geochemistry of the Kingman Feldspar, Rare Metals and Wagon Bow Pegmatites." ScholarWorks@UNO, 2010. http://scholarworks.uno.edu/td/1280.

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In the Mojave Pegmatite district, located in northwestern AZ, numerous pegmatites intrude syn- to post-collisional Paleoproterozoic granitic rocks. The slightly older Cerbat plutons are associated with the suturing of the Mojave and Yavapai terranes whereas Aquarius granites were emplaced during the Yavapai Orogeny as the sutured terranes docked with North America. A detailed study of 5 pegmatites shows that they are zoned with composite cores and contain REE minerals characteristic of NYF pegmatites. However, they exhibit characteristics atypical for NYF pegmatites including F depletion, whit

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43

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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44

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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45

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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46

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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47

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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48

White, Alex. "Chemical exchange processes in lanthanide (III), dioxouranium (VI) and sodium (I) complexes /." Title page, contents and summary only, 1987. http://web4.library.adelaide.edu.au/theses/09PH/09phw582.pdf.

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49

Cecconie, Theodore James 1961. "Fundamental studies on the separation of the lanthanides using solvent extraction systems." Thesis, The University of Arizona, 1988. http://hdl.handle.net/10150/276744.

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Fundamental solvent extraction studies on the separation of the lanthanides were carried out by investigating both the hydroxamic acid and phosphinic acid reagent families. In general, the lanthanides were found to extract as self-adducts. It was found that the separation of the individual lanthanides with both of these reagent families was adversely affected by steric hindrance.

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50

Wong, Ka-Leung, and 黃嘉良. "Synthesis, characterization, and photophysical studies of organic-lanthanide complexes." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2006. http://hub.hku.hk/bib/B36875351.

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