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Rozprawy doktorskie na temat „Chalcogenide alloys”

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Data publikacji: 6 września 2023

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Sprawdź 21 najlepszych rozpraw doktorskich naukowych na temat „Chalcogenide alloys”.

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1

Price, Samantha Jayne. "Chalcogenide alloys for optical recording." Thesis, University of Cambridge, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.621122.

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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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Thiagarajan, Suraj Joottu. "Thermoelectric properties of rare-earth lead selenide alloys and lead chalcogenide nanocomposites." The Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=osu1196263620.

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Benmore, Christopher James. "A neutron diffraction study on the structure of fast-ion conducting and semiconducting glassy chalcogenide alloys." Thesis, University of East Anglia, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.334267.

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Carria, Egidio. "Amorphous-Crystal Phase Transitions in Ge2Sb2Te5 and GexTe1-x alloys." Doctoral thesis, Università di Catania, 2012. http://hdl.handle.net/10761/933.

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Aim of this work was the investigation of the phase transitions in Ge2Sb2Te5 and GexTe1-x thin films. These alloys are of interest since they exhibit an excellent combination of electrical-optical and phase changing characteristics for memory applications. In particular we have focused our attention on the amorphous-crystal transition. We have then discussed the correlation between the local order in the amorphous network and the crystallization kinetics. To this aim we have modified the properties of the amorphous phase by laser and ion irradiation looking to the consequent variation in the p
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Bragaglia, Valeria. "Epitaxial Growth and Ultrafast Dynamics of GeSbTe Alloys and GeTe/Sb2Te3 Superlattices." Doctoral thesis, Humboldt-Universität zu Berlin, 2017. http://dx.doi.org/10.18452/18406.

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In dieser Arbeit wird das Wachstum von dünnen quasi-kristallinen Ge-Sb-Te (GST) Schichten mittels Molekularstrahlepitaxie demonstriert, die zu einer geordneten Konfiguration von intrinsischen Kristallgitterfehlstellen führen. Es wird gezeigt, wie es eine Strukturanalyse basierend auf Röntgenstrahlbeugungssimulationen, Dichtefunktionaltheorie und Transmissionselektronenmikroskopie ermöglicht, eine eindeutige Beurteilung der Kristallgitterlückenanordnung in den GST-Proben vorzunehmen. Das Verständnis für die Ordnungsprozesse der Gitterfehlstellen erlaubt eine gezielte Einstellung des Ordnungsgra
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7

Sahin, Cuneyt. "Spin dynamics of complex oxides, bismuth-antimony alloys, and bismuth chalcogenides." Diss., University of Iowa, 2015. https://ir.uiowa.edu/etd/1897.

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The emerging field of spintronics relies on the manipulation of electron spin in order to use it in spin-based electronics. Such a paradigm change has to tackle several challenges including finding materials with sufficiently long spin lifetimes and materials which are efficient in generating pure spin currents. This thesis predicts that two types of material families could be a solution to the aforementioned challenges: complex oxides and bismuth based materials. We derived a general approach for constructing an effective spin-orbit Hamiltonian which is applicable to all nonmagnetic materials
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Gunasekera, Kapila. "Fragility, melt/glass homogenization, self-organization in chalcogenide alloy systems." University of Cincinnati / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1382372615.

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9

Akhtar, Javeed. "Structural and optoelectronic studies of lead chalcogenide thin films and nanocrystals." Thesis, University of Manchester, 2010. https://www.research.manchester.ac.uk/portal/en/theses/structural-and-optoelectronic-studies-of-lead-chalcogenide-thin-films-and-nanocrystals(625f5327-bebc-42e3-898c-d884a3df8860).html.

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The work described herein deals with the synthesis and characterization of lead chalcogenide thin films and nanocrystals. The first part of thesis describes the properties of semiconductors followed by an analysis on the chemical vapour deposition and nanoparticulate formation. In the next part of thesis, single-source precursors of type thioselenophosphinato, selenoureato, dithiocarbamato and dithiocarbanato complexes of lead have been synthesised and characterised. As-synthesised compounds have been utilised for the fabrication of lead sulfide and lead selenide thin films by aerosol-assisted
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10

Martin, Joshua. "Methods of thermoelectric enhancement in silicon-germanium alloy type I clathrates and in nanostructured lead chalcogenides." [Tampa, Fla] : University of South Florida, 2008. http://purl.fcla.edu/usf/dc/et/SFE0002448.

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Singhal, Dhruv. "Forêt de nanofils semiconducteurs pour la thermoélectricité." Thesis, Université Grenoble Alpes (ComUE), 2019. http://www.theses.fr/2019GREAY016/document.

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La conversion thermoélectrique a suscité un regain d'intérêt en raison des possibilités d'augmenter l'efficacité tout en exploitant les effets de taille. Par exemple, les nanofils montrent théoriquement une augmentation des facteurs de puissance ainsi qu'une réduction du transport des phonons en raison d'effets de confinement et/ou de taille. Dans ce contexte, le diamètre des nanofils devient un paramètre crucial à prendre en compte pour obtenir des rendements thermoélectriques élevés. Une approche habituelle consiste à réduire la conductivité thermique phononique dans les nanofils en améliora
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12

Gomez, Marin Enrique. "Etude du comportement de la résistivité électrique des monochalcogénures de plutonium et des alliages de plutonium et americium." Université Joseph Fourier (Grenoble), 1997. http://www.theses.fr/1997GRE10018.

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Cette these est une contribution a l'etude des proprietes de transport electrique de composes d'actinides. En particulier, nous reportons les premieres mesures de resistivite electrique a haute temperature sur des monocristaux de composes de plutonium. Pour cela, nous avons mis au point un appareillage de mesure de resistivite electrique a haute temperature (entre 300k et 1000k) en boite a gants pour des echantillons de 4mm a 10mm de longueur. Nous avons developpe un nouveau type de porte-electrode afin d'etablir des contacts electriques sur l'echantillon selon une configuration quatre pointes
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13

Amanowicz, Michel. "Etude des propriétés de transport galvanomagnétique de composés de neptunium et de plutonium." Université Joseph Fourier (Grenoble), 1995. http://www.theses.fr/1995GRE10038.

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Cette these presente une etude par des mesures galvanomagnetiques (resistivite, magnetoresistance, effet hall) des proprietes de transport electrique des monopnictures et monochalcogenures de neptunium (de structure nacl), de la solution solide pusb(1-x)te(x), et du compose intermetallique nppt3. Pour une meilleure comprehension des phenomenes physiques nos mesures sont discutees en etroite association avec les resultats obtenus par la diffraction des neutrons, l'aimantation et la spectroscopie mossbauer. L'etablissement de l'ordre antiferromagnetique triple-k de type i pour les monopnictures
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14

Mouloudj, Noureddine. "Contribution à l'étude des propriétés thermodynamiques des alliages liquides selenium-tellure : relations avec les propriétés structurales." Paris 13, 1987. http://www.theses.fr/1987PA132012.

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On mesure l'activité du tellure en fonction de la température et de la concentration, à partir des mesures de F. E. M. On en déduit l'enthalpie libre de formation d'alliages se-te. On détermine également l'enthalpie molaire de mélange à 623, 673 et 733k. Influence de la coordinence sur ces propriétés thermodynamiques
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15

Bajaj, Saurabh. "Phase Diagrams and Defect Thermodynamics to Devise Doping Strategies in Lead Chalcogenide Thermoelectric Materials and its Alloys." Thesis, 2016. https://thesis.library.caltech.edu/9233/14/SaurabhBajaj2016thesis.pdf.

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<p>This thesis discusses the application of phase diagrams and the associated thermodynamics to semiconductor materials through theoretical computational calculations. The majority of work is focused on thermoelectric semiconducting materials that enable direct inter-conversion between electrical and thermal energy. First, one of the most efficient thermoelectric material, PbTe, is picked to demonstrate the assessment of unknown phase diagrams by combining two methods - DFT and CALPHAD. Since there had been no previous investigations of defect stability in this material using computations, DFT
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16

Vinod, E. M. "Investigations of Phase Change Memory Properties of Selenium Doped GeTe and Ge2Sb2Te5." Thesis, 2013. http://etd.iisc.ernet.in/2005/3339.

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GeTe and Ge2Sb2Te5 alloys are potential candidates for non-volatile phase change random access memories (PCRAM). For electrical data storage applications the materials should have stable amorphous and crystalline phases, fast crystallization time, low power to switch, and high crystallization activation energy (to be stable at normal operating temperatures). Phase change memories can be tuned through compositional variations to achieve sufficient phase change contrast and thermal stability for data retention. Selenium is one of the attractive choices to use as an additive material owing to its
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17

Wang, Heng. "High Temperature Transport Properties of Lead Chalcogenides and Their Alloys." Thesis, 2014. https://thesis.library.caltech.edu/8424/1/Heng_Wang_Thesis_Final.pdf.

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This thesis describes a series of experimental studies of lead chalcogenide thermoelectric semiconductors, mainly PbSe. Focusing on a well-studied semiconductor and reporting good but not extraordinary zT, this thesis distinguishes itself by answering the following questions that haven’t been answered: What represents the thermoelectric performance of PbSe? Where does the high zT come from? How (and how much) can we make it better? For the first question, samples were made with highest quality. Each transport property was carefully measured, cross-verified and compared with both historical and
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18

"Growth and Characterization of Chalcogenide Alloy Nanowires with Controlled Spatial Composition Variation for Optoelectronic Applications." Master's thesis, 2012. http://hdl.handle.net/2286/R.I.14875.

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abstract: Nanowires (NWs) have attracted many interests due to their advance in synthesis and their unique structural, electrical and optical properties. NWs have been realized as promising candidates for future photonic platforms. In this work, erbium chloride silicate (ECS), CdS and CdSSe NWs growth by vapor-liquid-solid mechanism and their characterization were demonstrated. In the ECS NWs part, systematic experiments were performed to investigate the relation between growth temperature and NWs structure. Scanning electron microscopy, Raman spectroscopy, X-ray diffraction and photoluminesce
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19

"Layer Structured Gallium Chalcogenides: Controlled Synthesis and Emerging Properties." Doctoral diss., 2018. http://hdl.handle.net/2286/R.I.50507.

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abstract: Layer structured two dimensional (2D) semiconductors have gained much interest due to their intriguing optical and electronic properties induced by the unique van der Waals bonding between layers. The extraordinary success for graphene and transition metal dichalcogenides (TMDCs) has triggered a constant search for novel 2D semiconductors beyond them. Gallium chalcogenides, belonging to the group III-VI compounds, are a new class of 2D semiconductors that carry a variety of interesting properties including wide spectrum coverage of their bandgaps and thus are promising candidates for
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"Growth and Characterization of Multisegment Chalcogenide Alloy Nanostructures for Photonic Applications in a Wide Spectral Range." Doctoral diss., 2015. http://hdl.handle.net/2286/R.I.34822.

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abstract: In this dissertation, I described my research on the growth and characterization of various nanostructures, such as nanowires, nanobelts and nanosheets, of different semiconductors in a Chemical Vapor Deposition (CVD) system. In the first part of my research, I selected chalcogenides (such as CdS and CdSe) for a comprehensive study in growing two-segment axial nanowires and radial nanobelts/sheets using the ternary CdSxSe1-x alloys. I demonstrated simultaneous red (from CdSe-rich) and green (from CdS-rich) light emission from a single monolithic heterostructure with a maximum wave
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21

Abel, Paul Robert. "Chemical modification of nanocolumnar semiconductor electrodes for enhanced performance as lithium and sodium-ion battery anode materials." Thesis, 2014. http://hdl.handle.net/2152/26873.

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Chemical Engineering<br>The successful commercialization of lithium-ion batteries is responsible for the ubiquity of personal electronics. The continued development of battery technology, as well as its application to new emerging markets such as electric vehicles, is dependent on developing safer, higher energy density, and cheaper electrode materials and battery chemistries. The focus of this dissertation is on identifying, characterizing and optimizing new materials for lithium- and sodium-ion batteries. Batteries are incredibly complex engineered systems with each electrode composed of con
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