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Dissertations / Theses on the topic 'Rare-earth compounds'

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Published: 4 June 2021
Last updated: 6 September 2023

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1

Tanner, Peter. "Spectroscopy of rare earth compounds." Thesis, University of Surrey, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.320993.

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2

Köhler, Ulrike. "Thermoelectric transport in rare-earth compounds." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2008. http://nbn-resolving.de/urn:nbn:de:bsz:14-ds-1215004993567-14165.

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The focus of this thesis lies on the thermoelectric transport properties of rare-earth compounds containing Ce, Eu, and Yb. These systems have been investigated either to study fundamental problems or to evaluate their potential for thermoelectric applications.
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3

Köhler, Ulrike. "Thermoelectric transport in rare earth compounds." Berlin mbv, 2008. http://d-nb.info/990056686/04.

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4

Lazzouni, M. "Laser spectroscopy of rare earth compounds." Thesis, University of Oxford, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.235038.

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5

Johnson, Roger Douglas. "Magnetism in crystalline rare-earth compounds." Thesis, Durham University, 2011. http://etheses.dur.ac.uk/589/.

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In this thesis we investigate the magnetism of a selection of crystalline mate- rials that display fascinating macroscopic properties, largely due to the complex behaviour of rare-earth ions. The technique of choice is diffraction; shown to pro- vide the most lucid of results in this field of research. Neutron powder diffraction, a well established tool for determining magnetic structures, has been employed in order to determine two magnetic structures of the intermetallic R2CoGa8 series. This was the first such study of these materials, which are of great interest as the magnetic exchange interactions of the rare-earth ions compete with the crystal elec- tric field, giving rise to a wealth of magnetic properties tuneable by the choice of rare-earth ion. We then move on to study two of the most extreme multiferroic mate- rials, TbMn2O5 and TmMn2O5. We have developed a new technique for determin- ing electronic state specific magnetic structures through resonant x-ray diffraction, which we have successfully employed in an investigation of the terbium magnetic sub-lattice in TbMn2O5. The outstanding question in many multiferroics regards the exact microscopic mechanisms at play. Due to the huge potential in technology, this has been the subject of intense debate over that past decade. We have shown, through ab-initio computation and the simultaneous measurement of electric polar- isation and magneto-striction, that the exchange-striction model is dominant in the main ferroelectric phase of TbMn2O5 and TmMn2O5. Through ion specific resonant x-ray diffraction measurements, we have clarified the behaviour of the terbium sub- lattice upon the magnetic field induced electric polarisation reversal in TbMn2O5. Furthermore, we have made the discovery of additional incommensurate magnetic diffraction signals, believed to be indicative of the response of magnetic domains to applied magnetic fields.
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6

Köhler, Ulrike. "Thermoelectric transport in rare-earth compounds." Doctoral thesis, Technische Universität Dresden, 2007. https://tud.qucosa.de/id/qucosa%3A23707.

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The focus of this thesis lies on the thermoelectric transport properties of rare-earth compounds containing Ce, Eu, and Yb. These systems have been investigated either to study fundamental problems or to evaluate their potential for thermoelectric applications.
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7

Roy, Lindsay Elizabeth. "Rules for understanding rare-earth magnetic compounds." [College Station, Tex. : Texas A&M University, 2006. http://hdl.handle.net/1969.1/ETD-TAMU-1749.

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8

Stone, Lee Alexander. "Pulsed laser deposition of rare earth compounds." Thesis, University of Hull, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.273606.

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9

Ivan, dos Santos Oliveira. "Rare earth intermetallic compounds studied by nuclear orientation." Thesis, University of Oxford, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.357518.

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10

Campbell, Alistair Jonathan. "Neutron scattering studies of rare earth manganese oxides and rare earth nickel borocarbides." Thesis, University of Warwick, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.343210.

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11

Frontzek, Matthias. "Magnetic properties of R2PdSi3 (R = heavy rare earth) compounds." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2009. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-24779.

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The R2PdSi3 (R = heavy rare earth) have been synthesized first in 1990 in the search for materials with unusual electronic properties. The availability of single crystals was the starting point for several investigations of the magneto-crystalline anisotropy, also in applied magnetic fields. The results of the observed properties in resistivity, magnetization and susceptibility lead to the summary that these compounds range from interesting to exotic and that their magnetic properties are low dimensional, spin-glass like and altogether “novel”. The focus of this thesis is the careful analysis of the magnetic properties and magnetic structures of single crystalline R2PdSi3 (R = Gd, Tb, Dy, Ho, Er, Tm). The investigation of macroscopic properties uses magnetization and ac-susceptibility measurements. Resulting from these investigations are magnetic phase diagrams. Neutron and resonant X-ray diffraction measurements elucidate the magnetic structure for the investigated compounds. The phase diagram of Tb2PdSi3 is the starting point of a detailed neutron diffraction study in applied magnetic fields up to 6.5 T and in the temperature range from 0.05 K to 100 K on this compound. Key to the understanding of the R2PdSi3 is the strong coupling of crystallographic structure to the magnetic properties. Thus the established framework of exchange interaction and magneto-crystalline anisotropy allows a collective description instead of a “novel” behavior
Die R2PdSi3 (R = schwere seltene Erde) sind erstmals 1990, im Rahmen der Suche nach Materialien mit ungewöhnlichen elektronischen Eigenschaften, synthetisiert worden. Die Verfügbarkeit von Einkristallen war der Startpunkt für eine Vielzahl von Untersuchungen, auch in angelegten Magnetfeldern, der magneto-kristallinen Anisotropie. Das Ergebnis der untersuchten Eigenschaften Widerstand, Magnetisierung und Suszeptibilität führte zu dem Schluss, dass diese Verbindungen interessant bis exotisch und das ihre magnetischen Eigenschaften niedrig dimensional, spin-glas ähnlich und insgesamt “neuartig“ sind. Der Schwerpunkt dieser Dissertation ist die genaue Analyse der magnetischen Eigenschaften und Magnetischen Strukturen von einkristallinen R2PdSi3 (R = Gd, Tb, Dy, Ho, Er, Tm). Magnetisierungs- und Suszeptibilitäts-Messungen werden zur Untersuchung der makroskopischen Eigenschaften benutzt. Resultat dieser Untersuchungen sind magnetische Phasendiagramme. Neutronen und resonante Röntgendiffraktrometrie klären die magnetische Struktur der untersuchten Verbindungen auf. Das Phasendiagramm von Tb2PdSi3 ist der Startpunkt einer detaillierten Neutronendiffraktionsuntersuchung dieser Verbindung in Magnetfeldern bis 6.5 T und im Temperaturbereich von 0.05 K und 100 K. Der Schlüssel zum Verständnis der R2PdSi3 ist die starke Kopplung der kristallografischen Struktur und der magnetischen Eigenschaften. Dadurch erlaubt das etablierte System aus Austauschwechselwirkung und magneto-kristalliner Anisotropie eine gemeinsame Beschreibung anstatt „neuartigem“ Verhalten
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12

Polyakov, Andrey. "Fermi-surface investigations of rare-earth transition-metal compounds." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-113653.

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The interplay of partially filled d- or f-electron shells with conduction-band electrons is a key ingredient in new rare-earth transition-metal compounds for the emergence of unusual electronic and magnetic properties. Among which unconventional superconductivity is one of the most studied. Despite many years of intensive experimental investigations and plenty promising theoretical models, unconventional superconductivity still remains hotly debated a very rich topic. One of the fundamental unsolved problems for condensed-matter physicists is the mechanism that causes the electrons to form anisotropic superconductivity. Since electrons in the vicinity of the Fermi level are primarily responsible for superconductivity, in order to better understand the mechanism giving rise to this phenomenon and the origin of complex forces between correlated electrons, knowledge of the Fermi surface and band selective effective mass is essential. Of the many techniques used to study electronic band-structure properties, measurements of quantum oscillations in the magnetization, so-called de Haas-van Alphen (dHvA) effect, in combination with band-structure calculations is the traditional proven tool for studying Fermi-surface topology and quasiparticle effective mass. In the present work, electronic structure and Fermi-surface properties of Ybsubstituted heavy fermion superconductor CeCoIn5 and iron based ternary phosphides LaFe2P2 and CeFe2P2 have been investigated by means of dHvA measurements. For these measurements, capacitive cantilever-torque magnetometry was utilized. In Ce1−xYbxCoIn5, the evolution of the Fermi surface and effective mass was studied as a function of Yb concentration. The observed topology change is consistent with what is expected from the band-structure calculations. For a small Yb concentration, x = 0.1, the band-structure topology and the effective masses remain nearly unchanged compared to CeCoIn5. This contrasts clearly modified Fermi surfaces and light, almost unrenormalized effective masses for x = 0.2 and above. For LaFe2P2 and CeFe2P2, the obtained effective masses are light. Good agreement between the calculated and measured dHvA frequencies was identified only for LaFe2P2. However, for CeFe2P2 strong disagreement was observed. Moreover, different CeFe2P2 single crystals reveal different experimental results. In order to reconcile the results of the dHvA measurements and density-functional-theory calculations more work is necessary.
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13

Liao, Lexiang. "Cobalt site preferences in iron rare-earth based compounds." Thesis, McGill University, 1992. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=39786.

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This thesis presents the first systematic study of the cobalt site preferences in iron rare-earth based compounds. The Mossbauer source technique employed in this work offers a direct and unambiguous way to quantitatively determine cobalt site preferences in these compounds at extremely low cobalt contents. Data quality as well as counting efficiency for the source ($ sp{57}$Co doped) samples is enhanced by constructing a resonant conversion electron detector utilising 90% $ sp{57}$Fe enriched stainless steel foil. Our results have produced the most convincing evidence that cobalt substitutes preferentially for iron in these compounds. We have demonstrated that the site volume is the dominant factor controlling the preferential cobalt substitutions at transition-metal sites with volume $<$12.2A$ sp3$. The cobalt preference for a site decreases linearly with increasing site volume at a rate of $ sim$0.9A$ sp{-3}$. In general, cobalt shows a preference for sites with volume $<$11.8A$ sp3$. As site volume becomes sufficiently large ($ ge$12.2A$ sp3$), the negative enthalpy of mixing between cobalt and rare-earth plays a significant role in modifying the cobalt site preferences in combination with the site volume effects. This results in cobalt preferring strongly those sites with the highest number of rare-earth nearest-neighbors.
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14

Han, Zong-Pei. "Exchange and crystal-field effects in rare-earth compounds." Thesis, University of Manchester, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.488004.

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15

Dudley, R. "Magnetoelastic properties and microstructure of rare-earth/iron compounds." Thesis, University of Brighton, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.379867.

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16

Pfau, Heike. "Thermal Transport in Strongly Correlated Rare-Earth Intermetallic Compounds." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-164769.

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In dieser Arbeit wurden mit Hilfe von Transportmessungen – vor allem mit thermischem Transport bei sehr tiefen Temperaturen – intermetallische Seltenerdverbindungen untersucht. Diese Materialien sind oft durch starke elektronische Korrelationen gekennzeichnet, die zu neuartigen Eigenschaften führen. Um die Wechselwirkungen in den untersuchten Systemen zu beeinflussen, führten wir ein Magnetfeld als zusätzlichen Parameter ein. Damit untersuchten wir drei Fragestellungen. Im ersten Teil überprüften wir die Gültigkeit des Wiedemann-Franz-Gesetzes in YbRh2Si2. Dieses Material zeigt einen durch ein kleines Magnetfeld induzierten quantenkritischen Punkt, für dessen unkonventionelle Eigenschaften es noch keine allgemein etablierte mikroskopische Theorie gibt. Mit Hilfe des Wiedemann-Franz-Gesetzes haben wir untersucht, ob eine solche Theorie im Rahmen des Quasiteilchenbildes formuliert werden kann. Während wir eine Bestätigung für Magnetfelder abseits des quantenkritischen Punktes zeigen, ergibt unsere Analyse direkt am quantenkritischen Punkt eine Verletzung des Weidemann-Franz-Gesetzes. Dies hat weitreichende physikalische Folgen, da eine Verletzung den Zusammenbruch des Konzeptes von Quasiteilchen impliziert. In der zweiten Studie untersuchten wir die Kondogittersysteme YbRh2Si2 und CeRu2Si2 in Magnetfeldern mit Energien von der Größenordnung der Kondotemperatur. Beide Systeme zeigen bislang ungeklärte feldinduzierte Übergänge mit sehr unterschiedlichen Signaturen jedoch den selben Vorschlägen für deren Ursache: ein abrupter Zusammenbruch des Kondoeffekts oder ein Lifshitzübergang. Mit Thermokraft- und Widerstandsmessungen konnten wir für CeRu2Si2 zeigen, dass auch der thermische Transport kompatibel mit einem Lifshitzübergang ist. Ein globales Modell, das thermodynamische Größen mit einschließt, ist jedoch weiterhin nicht vorhanden. In YbRh2Si2 detektierten wir anstatt eines einzelnen, insgesamt drei Übergänge in höheren Magnetfeldern. Mithilfe einer sehr guten Übereinstimmung von renormalisierten Bandstrukturrechnungen mit unseren und früheren Experimenten, können wir die Entwicklung von YbRh2Si2 im Magnetfeld als Superposition von einer stetigen Unterdrückung des Kondoeffekts und drei Lifshitzübergängen beschreiben. Im dritten Projekt untersuchten wir den supraleitenden Ordnungsparameter von LaPt4Ge12. Während frühere Experimente auf konventionelle Supraleitung hindeuten, wird für das eng verwandte PrPt4Ge12 unkonventionelle und/oder Multiband-Supraleitung diskutiert. Resultate an der Substitutionsreihe LaxPr1-xPt4Ge12 suggerieren jedoch kompatible Ordnungsparameter für beide Verbindungen. Unsere Ergebnisse der spezifischen Wärme und der temperatur- und feldabhängigen Wärmeleitfähigkeit an LaPt4Ge12 sind kompatibel mit dem Modell konventioneller Supraleitung ohne Nullstellen im der supraleitenden Bandlücke. Die Abhängigkeit der Wärmeleitfähigkeit vom Feldwinkel zeigt unerwartet umfangreiche Oszillationsmuster. Während solche Oszillationen oft als Zeichen von Nullstellen in der Bandlücke interpretiert werden, konnten wir die meisten Frequenzen anderen Ursachen zuordnen. Eine sehr genaue Analyse von winkelabhängigen Messungen ist daher unabdingbar, um daraus Schlussfolgerungen für den Ordnungsparameter ziehen zu können.
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17

Morrison, Christopher Glen. "Point contact studies of rare earth-transition metal compounds." Thesis, University of Southampton, 2009. https://eprints.soton.ac.uk/69728/.

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Mechanical point contact techniques have been used to study the spin-dependent properties of rare earth-transition metal compounds and transition metal thin films and bi-layers. The transport spin polarisation of Cu, Co and Fe has been measured using point contact Andreev reflection (PCAR), and found to be in good agreement with previous results. In addition, bi-layers of Co/Y and Co/Cu have been used to demonstrate suppression of the spin polarisation of the Co underlayer via a nonmagnetic capping layer. The spin diffusion length of Cu has been estimated to be larger than 600nm. The spin polarisation of molecular beam epitaxy (MBE) deposited RFe2 (R = Dy,Y,Er) Laves phase intermetallic films was determined, and found to be close to that of Fe. This suggests that the spin transport behaviour in these materials is dominated by the Fe sub-lattice. Preliminary evidence for spin transfer torque effects in an RFe2 multilayer and tri-layer is also presented and discussed. Point contact measurements of an ErFe2/YFe2 multilayer at 4.2K show a step in the differential resistance at a positive current value. It is suggested that this is due to the formation of a nano-domain beneath the tip. Measurements of a DyFe2/YFe2/DyFe2 tri-layer show peaks in differential resistance for negative applied currents. This is tentatively attributed to the generation of spin waves within the YFe2 layer.
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18

Frontzek, Matthias Dietrich. "Magnetic properties of R2PdSi3 (R = heavy rare earth) compounds." Göttingen Cuvillier, 2009. http://d-nb.info/997364173/04.

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19

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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20

Bashir, Aiman Kamal Hamed. "Transport and thermodynamic properties of rare earth compounds and alloys." Thesis, University of the Western Cape, 2017. http://hdl.handle.net/11394/6190.

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Philosophiae Doctor - PhD (Physics)
Rare-earth (RE) elements possess an incompletely lled 4f shell, which is very small compared to typical interatomic distances. As a result of this, RE elements and compounds exhibit characteristic properties, which deviate signi cantly from those of other systems containing for instance the 3d transition elements with expanded 3d shells. As a result of a small radius of the 4f shell, the 4f electron does not participate in chemical bounding. Instead, the 4f electron together with the nucleus act virtually as an e ective nucleus. From chemical point of view all RE behave similarly. The overlap of the neighbouring f shells is extremely small. The magnetic moments associated with the 4f shell may be treated as well localized moments in contrast to the 3d which are itinerant.
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21

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. Chapter 1 introduces key metal-boryl and metal-gallyl compounds of the s, p, d and f-blocks via literature review. Chapter 2 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 describes the syntheses, structures and bonding analyses of rare earth metal gallyl compounds. The preparation of a new class of rare earth metal cations will also be reported. A short introduction to rare earth metal amidinates is given. Chapter 4 presents reactivity studies of the rare earth metal gallyl compounds described in Chapter 3. To facilitate a direct structure and reactivity comparison, the corresponding boryl compounds were also synthesised. The results of a comprehensive DFT computational study to investigate the structure and bonding in these compounds are also presented. A short introduction to metalelement and metalmetal bond reactivity is given. Chapter 5 presents full experimental procedures and characterising data for the new compounds reported. Appendix CD Appendix contains .cif files for all new crystallographically characterised compounds described.
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22

Gitlits, Alexander 1975. "Synthesis and structural survey of novel rare earth aryloxide and pyrazolate complexes." Monash University, Dept. of Chemistry, 2001. http://arrow.monash.edu.au/hdl/1959.1/8996.

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23

Kramer, Steve Andrew. "Mixed ionic-electronic conduction in rare earth titanate/zirconate pyrochlore compounds." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/26863.

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24

Mbulunge, Masevhe Hamisi. "Giant Magnetocaloric effect and Magnetic Properties of selected Rare-Earth compounds." University of the Western Cape, 2021. http://hdl.handle.net/11394/7926.

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Masters of Science
Rare-earth (RE) compounds have been an attractive subject, based on the unique electronic structures of the rare-earth elements. In particular, the RETX (RE = rare-earth, T = 3d/4d/5d, transition metals, and X = p – block elements) series is a large family of intermetallic compounds which crystallizes in different crystal structure depending on the constituents. Most of these compounds crystalize in the hexagonal, orthorhombic, and tetragonal crystal structure. On the other hand, the family of compounds RET2X2 adopted the tetragonal crystal structure of the ThCr2Si2 or the CaBe2Be2 with different space groups. Owing to the different crystal structure, these compounds show versatile magnetic and electrical properties such as Kondo effect, complex magnetic behaviour, valence fluctuation, unconventional and conventional superconductivity, heavy fermion behaviour, Fermi and non – Fermi liquid behaviour, metamagnetism, spin – glass, memory effect, crystal electric field (CEF), magnetoresistance and magnetocaloric effect. The history of magnetism reveals that it is closely related to practical applications and magnetic materials from the most vital components in many applications. These are memory devices, permanent magnets, transformer cores, magneto-mechanical devices and magneto-electronic devices. Recent additions to this list include magnetic refrigeration through the studies of magnetocaloric effect as well as spintronics. Magnetic refrigeration (MR) is an emerging technology and shows real potential to enter conventional markets and the principles of MR obeys the magnetocaloric effect (MCE), which is based on the effect caused by a magnetic field on the materials that accept the property of varying the magnetic entropy, as well as its temperature when varying the magnetic field. In this thesis, we report giant magnetocaloric effect and magnetic properties of NdPd2Al2 and RECuGa (RE = Nd, Dy, and Ho) compounds. These investigations were done through measurements of X – ray diffraction (XRD), magnetic susceptibility, ((T)), magnetization, (M(H)), isothermal magnetization, (M(H, T)), heat capacity, (Cp(T)) and electrical resistivity, ((T)). MCE has been studied from the isothermal magnetization and heat capacity measurements.The first chapter of the thesis describes the theoretical background from which the experimental results have been analyzed and interpreted. This is followed by the chapter which presents experimental details and methodology carried out in this thesis. Chapter three presents the results and discussion of the transport, magnetic and magnetocaloric properties of NdPd2Al2 compounds. XRD studies confirm the tetragonal CaBe2Ge2 – type structure with space group P4/nmm (No. 129). The results of (T), (T) and Cp(T) indicate a putative antiferromagnetic (AFM) phase transition at low temperature at, TN = 3 K. On the other hand, (T) data at high temperatures follow the Curie – Weiss relationship giving an effective magnetic moment close to that expected for the trivalent Nd3+ ion. The magnetization results indicate metamagnetic – like transition at a low field that bears a first-order character which corroborates with the Below – Arrott plots. Giant MCE was obtained for the NdPd2Al2 compound similar to those reported for potential magnetic refrigerant materials. Chapter four discusses the magnetic and thermodynamic properties of the series of compounds RECuGa where RE = Nd, Dy, and Ho. XRD studies indicate the orthorhombic CeCu2 – type crystal structure with space group Imma (No. 74) for all three compounds. Magnetic measurements indicate a putative AFM phase transition below 𝑇𝑁 = 7.1, 8.5, and 3.7 K for Nd, Dy, and Ho compounds, respectively. The high-temperature (T) data for all three compounds follow the Curie – Weiss relationship giving an effective magnetic moment close to that expected for the trivalent rare-earth ion. Again, large MCE were obtained for all three compounds similar to those reported for materials that can be used as magnetic refrigerant materials.
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McMorrow, D. F. "Crystal fields and hyperfine interactions in holmium compounds." Thesis, University of Manchester, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.377728.

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26

Park, Jongik. "Photoemission Study of the Rare Earth Intermetallic Compounds RNi2Ge2 (R=Eu, Gd)." Washington, D.C. : Oak Ridge, Tenn. : United States. Dept. of Energy. Office of Science ; distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2004. http://www.osti.gov/servlets/purl/835299-eRe3PQ/webviewable/.

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27

Yang, Ning. "Synchrotron Diffraction Studies of Spontaneous Magnetostriction in Rare Earth Transition Metal Compounds." Washington, D.C. : Oak Ridge, Tenn. : United States. Dept. of Energy. Office of Science ; distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2004. http://www.osti.gov/servlets/purl/835381-gxv1Km/webviewable/.

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28

Carboni, C. "The hyperfine interaction of holmium in some uniaxial compounds at low temperature." Thesis, University of Manchester, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.382790.

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29

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 environment imparted to the metal. Incorporation of a variety of N-aryl rings (mesityl, phenyl, para-isopropylphenyl and 2-pyrimidine) and PR2 moieties (PPh2, PO2C2H4 and PMe2) into the ligand design led to rare earth complexes that revealed diverse reaction behaviour. In particular, C–H bond activation, sigmatropic alkyl migration and ring opening insertion reactivity were observed. Kinetic and deuterium labeling studies are discussed with respect to the unique reaction mechanisms encountered during the study of these highly reactive organometallic rare earth complexes.
xxvi, 247 leaves : ill. (some col.) ; 29 cm + 1 CD-ROM
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30

Pasinli, Türker Eroğlu Ahmet E. "Preconcentration And Atomic Spectrometric Determination of Rare Earth Elements (Rees) In Environmental Samples/." [s.l.]: [s.n.], 2004. http://library.iyte.edu.tr/tezler/master/kimya/T000460.doc.

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31

Houshiar, Mahboubeh. "Kondo behaviour in Ce intermetallic compounds." Thesis, University of Southampton, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.242422.

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32

Cooper, Jeffery W. "Spectrophotometry of rare earth chloride and fluoride complexes in molten salt solutions using a remote high temperature sensor /." free to MU campus, to others for purchase, 2004. http://wwwlib.umi.com/cr/mo/fullcit?p3137687.

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33

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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34

Li, Hongguang. "Responsive luminescence toolbox for biological applications." HKBU Institutional Repository, 2016. https://repository.hkbu.edu.hk/etd_oa/275.

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In chapter one, literature review have been down about the photophysical properties of lanthanide complexes and their applications. In chapter 2, the design and synthesis of water soluble cyclen based europium complexes with cyclin A specific peptides were described. Linear and two-photon induced hypersensitive europium emission gave the real time signalling and also enhanced the two-photon induced emission from 12GM to 68GM after Cyclin A binding. In chapter 3, the design of water soluble multi-modal porphyrin based compounds for key cell cycle regulator- Plk 1 imaging and cancer cells inhibition were described. Two water soluble porphyrin compounds have been synthesized and shown the specific photodynamic therapy treatment in the cancer cells via the selectively binding with Polo-like kinase 1 (Plk1). Plk1 is responsible for cell cycle regulation. Commercial or known Plk1 inhibitor/bioprobes are always poor cell internalization and easily to be damaged by enzymatic degradation. In addition, these markers are not available to image and inhibit the Plk1 as dual function probe. We introduced a new approach amphiphilic porphyrin with Plk1 specific peptide. Our compounds shown responsive emission enhancement upon binding with Plk1 in aqueous medium. In vitro, it can triggered G2-M phase arrest and inhibited the cancer cells specific as Plk1 is overexpressed in cancer cell. In chapter 4, we designed and synthesized a platinumeuropium complex (PtEuL401) as a controlled delivery vehicle of cisplatin. PtEuL401 shown responsive emission with the appropriate light excitation in aqueous and in vivo during the drug delivery process. Compared with the existing prodrugs, we offer real-time monitoring of the therapy process. Also, the long emission lifetimes of lanthanides creates room for further development in time-resolved imaging protocols which eliminates the problem of autofluorescence.
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35

Cedervall, Johan. "Synthesis and characterizationof rare earth free magnetic materialsfor permanent magnet applications." Thesis, Uppsala universitet, Institutionen för kemi - Ångström, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-200882.

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In this thesis the compounds Fe5SiB2 and Fe5PB2 have beensynthesized via high temperature synthesis, including arc melting anddrop synthesis. The structure for both compounds are of Cr5B3 typewith the space group I4/mcm. The cell parameters were refined toa = 5.5533 Å and c = 10.3405 Å for Fe5SiB2 and a = 5.4903 Å andc = 10.3527 Å for Fe5PB2. The saturation magnetization at roomtemperature for Fe5SiB2 has been measured to 138.8 Am2/kg and theanisotropy constant has been estimated to 79 kJ/m3. Theferromagnetic properties and the high anisotropy constant makesthese materials promising as permanent magnet materials, but moreinvestigations are necessary.
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36

Al-Maghrabi, Mufied Mahmoud. "Thermoluminescence spectra from sulphates, fluorides and garnets doped with rare earth ions." Thesis, University of Sussex, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.366054.

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Luminescence measurements have been applied to three different structures namely, sulphate, fluorides and YAG. In all cases the RE doping suppresses the intrinsic emission and results in intense luminescence characteristic of the RE dopant. Additionally, in double doped samples, or contaminated ones, the TL data show that each dopant defines a glow peak, which is displaced in temperature relative to the others. Examples of this were discussed for CaS04:Ce,Mn; YAG:Nd,Tb,Cr,Mn; BaF2:Ho,Ce and BaF2:Tm,Ce. The data are discussed in terms of an energy transfer model between different parts of extended defect complexes which encompass the RE ion and the lattice defects. Calcium sulphate doped with Dy define a TL peak near 200°C suitable for radiation measurements, but when co-doped with Ag the TL peak move to higher temperatures with minor effects on the peak sensitivity. In Ce,Mn double doped samples, the peak temperatures differ by -7°C between the Ce and Mn sites. The TL glow curves from alkaline earth fluorides are complex and contain several overlapping peaks. Curve fitting show that the peak maxima below room temperature are insensitive to the RE dopant. Additionally the host material has a modest effect on the peak positions. Above room temperature each dopant provides a TL curve specific to the added RE ion and do not show common peaks. Concentration has many effects on the resultant glow curve, and even at the lowest concentration used here (0.01%) there is evidence of cluster formation. Samples with high RE content show low values of the frequency factor consistent with the energy transfer model in that the emission from RE-RE cluster dominates over the emission from direct charge recombination within the defect complex. The effect of concentration and the TL mechanism operating below room temperature are also discussed. Luminescence signals from the near surface of YAG:Nd (via CL) were contrasted with those from the bulk material via RL. Results indicate that the outer few micron layers differ significantly in luminescence response from the bulk crystal. The differences were ascribed to result from solvents that enter the YAG lattice during the growth stage or subsequently from cleaning treatments via the dislocations caused by cutting and polishing. Additionally, the growth stage may include gases from the residual air in the growth furnace trapped into the YAG lattice. In each case there is a discontinuity in luminescence intensity and/or emission wavelengths at temperatures which mach the phase transitions of the contaminants. At the transition temperature there will be a sudden pressure change and this will induce surface expansion or bulk compression. The differences between the two cases were detected by the alternatives of CL and RL excitation, where the Nd or Er lines have moved in opposite directions. The detection of such low concentrations of solvents/trapped gases by luminescence is extremely difficult due to experimental limitations. Hence their role in luminescence generation is normally ignored.
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37

Neuenschwander, Jürg. "A high pressure low temperature study on rare earth compounds : semiconductor to metal transition /." [S.l.] : [s.n.], 1988. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=8668.

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38

Duong. "Correlation between magnetic interactions and magnetic structures in some antiferromagnetic rare earth intermetallic compounds." Amsterdam : Amsterdam : [s.n.] ; Universiteit van Amsterdam [Host], 2002. http://dare.uva.nl/document/62035.

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39

Jones, D. L. "Neutron and X-ray scattering studies of magnetism in rare earth and actinide compounds." Thesis, Keele University, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.293513.

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40

Wilson, Duane C. "Synthesis, Structure, And Characterization Of Rare Earth(Iii) Transition Metal Cyanides; Lanthanide(Ii) And Metallocene Amidotrihydroborates." Columbus, Ohio : Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1230880974.

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41

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 bridging. The lanthanide nitrate salts formed only polymeric complexes with galactitol. Not all of the complexes showed nitrate ions coordinated to the metal centre, and in the neodymium nitrate– galactitol complex, which shows both monodentate and bidentate coordination of the nitrate groups. The coordination of the nitrate ions was confirmed using both XRD and IR analysis. Two complexes with lanthanide chloride salts and cis,cis,cis-1,3,5-cyclohexanetriol were synthesised and analysed. Lanthanum chloride formed a polymeric complex, which showed extensive chloride bridging between the metal centres. Praseodymium chloride formed a dimeric complex. All complexes were analysed with single-crystal X-ray diffraction, 1H NMR, 13C NMR and IR spectroscopy.
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42

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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43

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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44

Mboukam, Jean Jules. "Magnetocaloric effect and critical behaviour near the magnetic phase transition temperature in rare-earth compounds." University of the Western Cape, 2018. http://hdl.handle.net/11394/6218.

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Magister Scientiae - MSc (Physics)
Rare-earth intermetallic compounds continue to draw considerable attention, due to their fundamental importance in understanding physical properties and potential applications based on a variety of phenomena. The focus of this project is to employ two family of rare-earth intermetallic compounds: RE2Pt2In (RE = Pr, Nd) and RE8Pd24Ga (RE = Gd, Tb, Dy) ternary intermetallic systems as a model candidate to uncover the underlying ground state properties that result in a strong coupling between the conduction electron and the 4f-electron of the rare-earth ions.
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45

Bentien, Anders [Verfasser]. "Transport and magnetic properties of rare-earth containing clathrates and clathrate-like compounds / Anders Bentien." Aachen : Shaker, 2005. http://d-nb.info/1181619599/34.

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46

Taylor, Jonathan W. "An experimental investigation of the lattice-magnetism interactions in rare earth and transition metal compounds." Thesis, Loughborough University, 1999. https://dspace.lboro.ac.uk/2134/13758.

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The interaction between magnetism and the nuclear lattice is investigated experimentally, using thermal expansion, magnetostriction, specific heat, magnetisation and neutron scattering measurements. Both localised moment systems, as represented by the rare earth compounds Tb2Agln, Pd2Gdln and Cu2Gdln, as well as transition metal compounds, Ni2MnGa and V20 3 have been characterised at low temperatures. Measurements of the lattice properties are important due to the intrinsic coupling of magnetic degrees of freedom to them. The response of the lattice to magnetic order, and also to applied magnetic fields have been probed by the use of the aforementioned techniques. Such techniques allow the direct determination of the coefficient of linear thermal expansion, over a wide temperature range and the forced magnetostriclion in applied fields of 0 to 7T. Indirect determination of the spontaneous magnetostriction and the total magnetic entropy contribution via measurements of isostructural compounds further enhance the range of experimental data available. The dynamic properties are characterised by spin polarised neutron scattering measurements. The experimental results are presented and discussed. Various methods of coupling lattice and electronic degrees of freedom have been investigated. It is argued that in order to fully understand and appreciate the low temperature properties of the materials investigated such a coupling must be taken into account.
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47

Osborn, Raymond. "Neutron inelastic scattering studies of magnetic exitations in rare earth compounds and transition metal alloys." Thesis, University of Southampton, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.292435.

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48

Malliakas, Christos D. "Charge density waves and structural modulations in polytelluride compounds." Diss., Connect to online resource - MSU authorized users, 2007.

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49

Stumphy, Brad David. "Mechanical and oxidation properties of some B2 rare earth-magnesium intermetallic compounds (RMg; R = Y, Ce)." [Ames, Iowa : Iowa State University], 2006.

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50

Milliez, Anne. "UP-CONVERSION IN RARE-EARTH DOPED MICRO-PARTICLES APPLIED TO NEW EMISSIVE 2D DISLAYS." Doctoral diss., University of Central Florida, 2006. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/3966.

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Up-conversion (UC) in rare-earth co-doped fluorides to convert diode laser light in the near infrared to red, green and blue visible light is applied to make possible high performance emissive displays. The infrared-to-visible UC in the materials we study is a sequential form of non-linear two photon absorption in which a strong absorbing constituent absorbs two low energy photons and transfers this energy to another constituent which emits visible light. Some of the UC emitters' most appealing characteristics for displays are: a wide color gamut with very saturated colors, very high brightness operation without damage to the emitters, long lifetimes and efficiencies comparable to those of existing technologies. Other advantages include simplicity of fabrication, versatility of operating modes, and the potential for greatly reduced display weight and depth. Thanks to recent advances in material science and diode laser technology at the excitation wavelength, UC selected materials can be very efficient visible emitters. However, optimal UC efficiencies strongly depend on chosing proper operating conditions. In this thesis, we studied the conditions required for optimization. We demonstrated that high efficiency UC depends on high pump irradiance, low temperature and low scattering. With this understanding we can predict how to optimally use UC emitters in a wide range of applications. In particular, we showed how our very efficient UC emitters can be applied to make full color displays and very efficient white light sources.
Ph.D.
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Optics and Photonics
Optics
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