Dissertations / Theses on the topic 'Scanning XRF'
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Miller, Eric J. "High-Resolution Sediment Records of Seismicity and Seasonal Sedimentation from Prince William Sound, Alaska, using XRF Core Scanning." W&M ScholarWorks, 2014. https://scholarworks.wm.edu/etd/1539617947.
Full textDehlinger, Mael. "XAS-XEOL and XRF spectroscopies using near field microscope probes for high-resolution photon collection." Thesis, Aix-Marseille, 2013. http://www.theses.fr/2013AIXM4048/document.
Full textScanning Probe Microscopes allow to obtain sample topography up to atomic resolution. X-ray spectroscopies allow elemental and structural analysis of a sample with accuracy better than 1 Å. The lateral resolution is limited by the primary beam diameter, currently a few µm². We have chosen to couple this two technics. Local sample visible luminescence is collected through a low aperture sharp optical fibre, probe of a shear force microscope. This technique was used to characterize microstructured semiconducting samples to achieve simultaneously the surface topography and luminescence mapping. The results were obtained using either synchrotron radiation or a laboratory microsource equipped with a polycapillary lens. To extend this concept to a wider variety of materials, local XRF collection by an EDX detector equipped with a cylindrical X-ray capillary was tested. A cobalt sample irradiated with the microsource was used for technique evaluation. The signal magnitude dependence with the capillary diameter was measured. Modelling and numerical calculations were developed to estimate the signal magnitude that could be detected using a 1 µm diameter capillary. The optimal system geometry was determined. Scanning Probe Microscopy combined to XRF analysis could thereby lead to simultaneous acquisition of sample topography and chemical mapping. The expected lateral resolution using synchrotron radiation is 100 nm while sub 1 µm resolution is realistic with a laboratory source. This technique would allow to point a peculiar micro- or nano-object on the surface and to perform its chemical analysis
Longhini, Elisa <1988>. "Scanning macro-XRF: Calculation of Sensitivity and Limits of Detection for common pigments in historical paintings and the investigation of Rembrandt’s ‘Saul and David’." Master's Degree Thesis, Università Ca' Foscari Venezia, 2014. http://hdl.handle.net/10579/4769.
Full textCartapanis, Olivier. "Variabilité de la zone de minimum d’oxygène du Pacifique Est équatorial au cours du Quaternaire récent." Thesis, Aix-Marseille, 2012. http://www.theses.fr/2012AIXM4365/document.
Full textThis thesis aims at documenting the spatiotemporal variations of the Oxygen Minimum Zone (OMZ) of the northeastern Pacific, and identifying the mechanisms that caused theses variations. The study is based on the geochemical analyses of major, minor, and trace elements of sediments from the northeastern Pacific, by combining ICP-MS and XRF scans measurements. These measurements allowed distinguishing the effect of biologic productivity and oceanic ventilation on sediment oxygenation. I was able to highlight the predominant impact of the productivity off the Baja California Margin (23°N), which varied in phase with the high northern Atlantic temperature across the past 120,000 years. Moreover, oceanic ventilation did play an important role off the Papagayo Gulf (12°N), because of the advection of water mass coming from the high northern and southern latitudes. OMS intensity in the northeastern Pacific could thus be influenced by changes in the atmospheric and oceanic circulation, in relation to high northern and southern latitudes climates
Simán, Frans Filip. "Assessment of Machine Learning Applied to X-Ray Fluorescence Core Scan Data from the Zinkgruvan Zn-Pb-Ag Deposit, Bergslagen, Sweden." Thesis, Luleå tekniska universitet, Geovetenskap och miljöteknik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-82050.
Full textSaffarini, Ghassan. "X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), differential scanning calorimetry (DSC) and density study of ternary chalcogenide glasses based on Ge-Se and Ge-S." Thesis, Brunel University, 1991. http://bura.brunel.ac.uk/handle/2438/7396.
Full textMotylenko, Mykhaylo. "Beitrag zur Analyse von Disklinationsstrukturen in plastisch verformten Metallen." Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2011. http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-67416.
Full textAlajtal, Adel Imhemed. "Raman spectroscopic application for the analysis of organic compounds and minerals of astrobiological significance : the detection and discrimination of organic compounds and mineral analogues in pure and mixed samples of astrobiological significance using raman spectroscopy, XRD and scanning electron microscopy." Thesis, University of Bradford, 2010. http://hdl.handle.net/10454/4425.
Full textAlajtal, Adel I. "Raman spectroscopic application for the analysis of organic compounds and minerals of astrobiological significance. The detection and discrimination of organic compounds and mineral analogues in pure and mixed samples of astrobiological significance using raman spectroscopy, XRD and scanning electron microscopy." Thesis, University of Bradford, 2010. http://hdl.handle.net/10454/4425.
Full textPappas, Adlreburg Nickolas. "To Make Iron of Iron : A Comprehensive Analytical Study of Spade Shaped Iron Bars." Thesis, Stockholms universitet, Arkeologiska forskningslaboratoriet, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-145694.
Full textAltun, Naci Emre. "Beneficiation Of Himmetoglu And Beypazari Oil Shales By Flotation And Their Thermal Characterization As An Energy Source." Phd thesis, METU, 2006. http://etd.lib.metu.edu.tr/upload/2/12606990/index.pdf.
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Newton, Thomas Russell. "Investigation of the effect of process parameters on the formation of recast layer in wire-EDM of Inconel 718." Thesis, Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/22580.
Full textBurkey, Michael F. "A REVIEW OF IRON SULFIDES AND OXIDES IN COAL MINE WASTE, HUFF RUN WATERSHED, OHIO." Kent State University Honors College / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ksuhonors1525905282950671.
Full textBahfenne, Silmarilly. "Single crystal Raman spectroscopy of selected arsenite, antimonite and hydroxyantimonate minerals." Thesis, Queensland University of Technology, 2011. https://eprints.qut.edu.au/46234/1/Silmarilly_Bahfenne_Thesis.pdf.
Full textSharma, Varun. "Evaluation of novel metalorganic precursors for atomic layer deposition of Nickel-based thin films." Master's thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-166627.
Full textNickel and nickel(II) oxide are widely used in advanced electronic devices . In microelectronic industry, nickel is used to form nickel silicide. The nickel mono-silicide (NiSi) has emerged as an excellent material of choice for source-drain contact applications below 45 nm node CMOS technology. As compared to other silicides used for the contact applications, NiSi is preferred because of its low resistivity, low contact resistance, relatively low formation temperature and low silicon consumption. Nickel is used in nickel-based rechargeable batteries and ferromagnetic random access memories (RAMs). Nickel(II) oxide is utilized as transistor gate-oxide and oxide in resistive RAMs. Atomic Layer Deposition (ALD) is a special type of Chemical Vapor Deposition (CVD) technique, that is used to deposit very smooth as well as homogeneous thin films with excellent conformality even at high aspect ratios. It is based on self-terminating sequential gas-solid reactions that allow a precise control of film thickness down to few Angstroms. In order to fabricate todays 3D electronic devices, technologies like ALD are required. In spite of huge number of practical applications of nickel and nickel(II) oxide, a few nickel precursors are available for thermal based ALD. Moreover, these precursors have resulted in poor film qualities and the process properties were also limited. Therefore in this master thesis, the properties of various novel nickel precursors had to be evaluated. All novel precursors are heteroleptic (different types of ligands) complexes and were specially designed by the manufacturer for thermal based ALD of pure nickel with H 2 as a co-reactant. In order to evaluate the novel precursors, a new methodology was designed to test small amounts (down to 2 g) of precursors in a very time efficient way. This methodology includes: TGA/DTA curve analyses of the precursors, thermal stability tests in which the precursors (< 0.1 g) were heated at elevated temperatures in a sealed environment for several hours, deposition experiments, and film characterizations. The depositions were monitored with the help of in situ quartz crystal microbalance, while application related film properties like chemical composition, physical phase, thickness, density, roughness and sheet resistance were investigated with the help of ex situ measurement techniques. Prior to the evaluation of novel nickel precursors, a benchmark ALD process was developed from the reference nickel precursor (Ni(amd)) and air as a co-reactant. The main goal of developing and optimizing such benchmark ALD process was to extract standard process parameters like second-reactant exposure times, Argon purge times, total process pressure, starting deposition temperature and gas flows. These standard process parameters had to be utilized to shorten the process development task (thus saving precursor consumption) and optimize the sublimation temperature for each novel precursor. The ALD behaviour was checked in terms of growth rate by varying the nickel precursor exposure time, precursor temperature and deposition temperature
Bright, Andrew G. "Mechanistic Insights into the Stabilisation of Biopharmaceuticals using Glycine Derivatives. The Effect of Glycine Derivatives on the Crystallisation, Physical Properties and Behaviour of Commonly used Excipients to Stabilise Antigens, Adjuvants and Proteins in the Solid State." Thesis, University of Bradford, 2015. http://hdl.handle.net/10454/15943.
Full textAllain, Vanessa. "Bicouches lipidiques modèles pour l'étude des interactions de substances exogènes avec les membranes biologiques : exemple d'un principe actif squalénisé, le ddC-SQ." Thesis, Paris 11, 2011. http://www.theses.fr/2011PA114843.
Full textDrugs must cross one or more biological membranes (plasma membrane, intracellular membrane) to reach their intracellular target. Interactions between drug and membranes play a significant role in the pharmacokinetic properties of drug such as transport, distribution, accumulation. Moreover, drugs may alter membrane properties. The complexity of the composition (protein and lipid) and the structural properties (heterogeneity) of membranes leads to a difficult investigation of these interactions. Consequently, use of simplified model membranes is needed. In this work, model lipid bilayer systems in which the lipid organization mimics the arrangement of lipids in natural membrane have been developed. In this way, the complexity of lipid composition mixtures has been progressively increased. The primary function of membrane is to physically separate aqueous compartments from their surroundings. The intracellular and extracellular fluids differ in ionic composition. This study firstly consists to estimate the influence of aqueous medium nature on the thermodynamic and structural properties of these model membranes.In physiological conditions (pH 7.4, ionic strength 150 mM), the most significant change was obtained in the presence of divalent ions. Markedly change in lipid organization was observed and the formation of unilamellar vesicles has been evidenced (at low concentrations) in simple model bilayers. Interactions of an antiretroviral nucleoside analogue, the SQddC, with lipid systems constitute the second part of our work. Squalene has been covalently coupled to ddC, in order to improve its therapeutic index. Squalenoylation leads to amphiphilic prodrugs which self-organize as nanoparticles. ddC weakly interacts with lipid membranes while SQddC-SQ can insert into membranes between hydrophobic alkyl chains and induce disruption of lipid organization. Consequently, the efficacy and/or toxicity of this drug could change
Smith, Thomas. "Studies of p-type semiconductor photoelectrodes for tandem solar cells." Thesis, Loughborough University, 2014. https://dspace.lboro.ac.uk/2134/14522.
Full textGill, Yasir Q. "Preparation and characterization of polyethylene based nanocomposites for potential applications in packaging." Thesis, Loughborough University, 2015. https://dspace.lboro.ac.uk/2134/18052.
Full textOrnek, Cem. "Performance characterisation of duplex stainless steel in nuclear waste storage environment." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/performance-characterisation-of-duplex-stainless-steel-in-nuclear-waste-storage-environment(4db73e9b-c87c-40a6-9778-0b823b1c499f).html.
Full textHales, Matthew Cameron. "Synthesis and characterisation of substituted smithsonite and calcite." Thesis, Queensland University of Technology, 2008. https://eprints.qut.edu.au/16643/1/Matthew_Hales_Thesis.pdf.
Full textHales, Matthew Cameron. "Synthesis and characterisation of substituted smithsonite and calcite." Queensland University of Technology, 2008. http://eprints.qut.edu.au/16643/.
Full textMAZZINGHI, ANNA. "Sviluppo di strumentazione xrf a scansione per applicazioni ai beni culturali." Doctoral thesis, 2016. http://hdl.handle.net/2158/1044076.
Full textBanerjee, Sikhar. "Biogeochemical Evolution of the Western Interior Basin of North America during a Kasimovian Highstand and Regression." Thesis, 2011. http://hdl.handle.net/1969.1/ETD-TAMU-2011-12-10706.
Full textFalster, Georgina Maja. "Reconstructing Australia’s late Quaternary climate from the geochemistry of lake sediments and snail shells." Thesis, 2019. http://hdl.handle.net/2440/120398.
Full textThesis (Ph.D.) -- University of Adelaide, School of Physical Sciences, 2019
Pereira, Paulo Sérgio Marques. "Ligas de Ouro em Pintura: Nova Metodologia de Estudo de Obras de Arte." Master's thesis, 2021. http://hdl.handle.net/10316/98078.
Full textNesta dissertação pretendeu-se realizar uma análise comparativa das ligas metálicas presentes em amostra provenientes de Obras de Arte entre o século XIV-XVII.As análises foram efetuadas em amostras provenientes do, Túmulo da Rainha Santa Isabel (TRS), Túmulo da Neta da Rainha Santa Isabel (TNRS), Busto de Santa Clara (BSC), Túmulo de Catarina de Urgel (TCU), Retábulo do Corpo de Deus (RCD), Eira Pedrinha (EP), Retábulo do São Miguel Arcanjo (RASM), Torre da Almedina (TA), Predela da Aparição de Cristo à Virgem (PACV), Lactatio de São Bernardo-Virgem (LSBV), São Gonçalo (SG), Quadros Museu Nacional Machado de Castro, Anunciação(P25), Lamentação de Cristo (P26), Aparição de Cristo à Virgem (P27), Trindade (P90), Capela de Santa Cruz, Capela de São Miguel e Nossa Senhora da Conceição (NSC).As análises efetuadas permitiram obter dados referentes à percentagem dos elementos que compunham as ligas metálicas, mais precisamente da percentagem de ouro (Au), prata (Ag) e cobre (Cu) e para tal recorreu-se a técnicas como a Microscopia Ótica (MO), Espectroscopia de Fluorescência Raio- x de bancada (b-XRF) e SEM-EDS.Após a obtenção dos resultados, estes foram cruzados de forma a tentar obter padrões, que quando comprovados permitiram enquadrar as amostras em estudo numa janela temporal lógica.(TEXTO ADICIONADO APENAS COM O INTUITO DE OBTER OS CARACTERES MÍNIMOS PRA SUBMISSÃO ONLINE, NÃO DEVE SER TIDO EM CONSIDERAÇÃO PARA O RESUMO DA DISSERTAÇÃO. NÃO FOI ADICIONADO TEXTO AO RESUMO DEVIDO A ESTE ENQUADRAR-SE DENTRO DOS LIMITES MÁXIMOS APRESENTADOS EM "https://www.uc.pt/fctuc/dct/estudantes/dissertacoes/normasFormatDissMest" DE 300 PALAVRAS)
In this dissertation, it was intended to carry out a comparative analysis of the metallic alloys present in samples from artworks between the 14th and 17th centuries. The analyzes were carried out on samples from the Tomb of Queen Saint Isabel (TRS), Tomb of Queen Saint Isabel's Granddaughter (TNRS), Bust of Saint Clara (BSC), Tomb of Catarina de Urgel (TCU), Altarpiece of Corpus Christi (RCD), Eira Pedrinha (EP), Archangel Saint Michael Altarpiece (RASM), Almedina Tower (TA), Predela of the Apparition of Christ to the Virgin (PACV), Lactation of Saint Bernardo-Virgem (LSBV), Saint Gonçalo (SG), Art Paintings of the Machado de Castro National Museum, Annunciation (P25), Lamentation of Christ (P26), Apparition of Christ to the Virgin (P27), Trinity (P90), Chapel of Santa Cruz, Chapel of Saint Michael and Nossa Senhora da Conceição (NSC).The analyzes performed allowed us to obtain data regarding the percentage of elements that made up metallic alloys, more precisely the percentage of gold (Au), silver (Ag), and copper (Cu) and for this, techniques such as Optical Microscopy (OM), Benchtop X-Ray Fluorescence Spectroscopy (b-XRF) and SEM-EDS were used.After obtaining the results, these were crossed to try to obtain patterns, which, when proven, allowed us to connect the samples present in this study to an artist and to a logical time window.(TEXTO ADICIONADO APENAS COM O INTUITO DE OBTER OS CARACTERES MÍNIMOS PRA SUBMISSÃO ONLINE, NÃO DEVE SER TIDO EM CONSIDERAÇÃO PARA O RESUMO DA DISSERTAÇÃO. NÃO FOI ADICIONADO TEXTO AO RESUMO DEVIDO A ESTE ENQUADRAR-SE DENTRO DOS LIMITES MÁXIMOS APRESENTADOS EM "https://www.uc.pt/fctuc/dct/estudantes/dissertacoes/normasFormatDissMest" DE 300 PALAVRAS)
Motylenko, Mykhaylo. "Beitrag zur Analyse von Disklinationsstrukturen in plastisch verformten Metallen." Doctoral thesis, 2009. https://tubaf.qucosa.de/id/qucosa%3A22759.
Full textSkoczylas, Łukasz. "Polimorfizm wybranych tetrafluoroboranów heksadimetylosulfotlenków metali dwuwartościowych : kobaltu manganu, niklu i cynku." Praca doktorska, 2010. http://ruj.uj.edu.pl/xmlui/handle/item/41690.
Full textManeshi, Abolfazl. "In-Situ Ethylene Polymerization with Organoclay-Supported Metallocenes for the Preparation of Polyethylene-Clay Nanocomposites." Thesis, 2010. http://hdl.handle.net/10012/5212.
Full textΦούσκας, Αγάπιος. "Μελέτη τροποποιημένων με βόριο καταλυτών Νi/Al2O3 για την αναμόρφωση του μεθανίου με διοξείδιο του άνθρακα." Thesis, 2011. http://hdl.handle.net/10889/4965.
Full textThe intensity of the greenhouse effect is constantly increasing in the last few decades with an adverse effect both on the environment and the humanity. In order to decrease the effect, human-caused emissions should be minimized. The two most important greenhouse gases, methane and carbon dioxide, can be used in the DRM (Dry Reforming of Methane) process. With this process the above mentioned gases are converted to synthesis gas, which is then used for the synthesis of a great number of organic compounds and synthetic fuels (through the Fisher-Tropsch syntheses) or for the production hydrogen to be used as a fuel (energy purposes). The DRM process presents a number of advantages, namely: no water is required, relatively low cost of process plants,it can be used as a Chemical Energy Transfer System and, finally, the produced synthesis gas has adequate CO/H2 ratio for Fisher-Tropsch syntheses. Although DRM is a promising process, its industrial application is hindered by a major drawback: the catalysts are rapidly deactivating due to coking. In the current study, the state of the art catalyst Ni/Al2O3 was studied and modified with boron, using different ratios of Β/(B+Νi). Our primary objective was to reduce coking. The modified catalysts were synthesized by wet co-impregnation and physicochemically characterized in their oxidic, reduced and used forms, using various techniques, in order to investigate the influence of boron on the texture (BET, Porosimetry, SEM, TEM), structure (XRD, UV-Vis DRS) and reducibility (H2-TPR) of the catalysts. The catalytic performance for the DRM process was studied under stable conditions (973Κ, 1 atm and 50%CH4-50%CO2 undiluted feed), for 24h, using a fixed bed reactor. Carbonaceous deposits on the used catalysts were determined by Temperature Programmed Hydrogenation (TPH). Scanning Electron Microscopy (SEM) with EDS analyser and Transmission Electron Microscopy (TEM) were also used in the study of reduced and used catalytic samples. Modifying Ni/Al2O3 catalysts with boron results in a great decrease of the deposited coke (up to 86%), without any significantly influence on the activity and selectivity of the catalysts. A major factor influencing the catalyst is the B loading, with the ratio Β/(B+Νi)=0,5 giving the best results. Boron’s positive effect was mainly attributed to its ability to increase Ni dispersion. Modification of Ni/Al2O3 catalysts, by using the appropriate boron loading, resulted to an increase of the amount of nickel nanoparticles with an average dimension under 6.0 nm, which are known to minimize coke deposition.
Shahcheraghi, Nikta. "Synthesis of novel plasmonic materials and their optical properties." Thesis, 2016. http://hdl.handle.net/10453/90040.
Full textThe field of ‘plasmonics’ has gained a lot of attention recently. This is because plasmonic phenomena can be used in a wide variety of modern devices, including biosensors, intracellular probes, spectrally-selective coatings, hyperthermal medical treatments, new kinds of photonic devices, nano-optics, scanning microscopy and optical cloaking. One issue with plasmonics, however, is that the metallic materials currently used cause high losses due to conversion of light to heat. The aim of my project was to discover ways to minimize optical losses in materials and nanostructures used for plasmonics. My search for better materials extended over the pure elements, intermetallic alloys and conventional alloys systems. The most promising example from each of these material types was selected for further examination on the basis of their having a low optical loss over some region of the visible spectrum. The representatives were Ag for the pure elements, PtAl₂ for the intermetallic compounds, and α- (Cu,Al) for the metallic alloys. Silver is considered as one of the most desirable materials for plasmonic devices as it has low loss (low ε₂) across the visible spectrum. Unfortunately, silver nanostructures oxidize or corrode in air. My project started with a study of silver nanotriangles which I synthesized using ‘wet chemical’ techniques. The aim of this part of the project was to discover how fast the silver nanoparticles oxidized and whether some means of preventing the oxidation could be found. I used scanning electron microscopy (SEM), transmission electron microscopy (TEM), atomic force microscopy (AFM) and UV-visible spectroscopy to characterize my samples. Unfortunately, while the silver nanotriangles colloids were stable in a sealed bottle for several months, they oxidized within a few days once removed. I did not find a way to prevent this. I did find that silver nanotriangles are able to self-assemble into complex structures that include tip-to-tip or base-to-base, or double- and triple-decker sandwich configurations. The optical properties of these interesting arrangements were explored through computer simulations based on the discrete dipole approximation (DDA). The effect of aspect ratio, gap size and substrate were considered. It has been predicted in the recent literature that the brassy-yellow PtAl₂ intermetallic compound should be capable of exhibiting reasonably strong localized surface plasmon resonances. In this part of my project I investigated ways to fabricate PtAl₂ nanoparticles to test this claim. Ordered arrays of PtAl₂ semi-shells were created using magnetron sputtering by co-depositing Al and P𝑡 onto a template of Synthesis of Novel Plasmonic Materials and Their Optical Properties monodisperse spherical polystyrene particles of 300 nm diameter. Deposition was carried out at an acute angle to the substrate so that the resulting semi-shells could be subsequently separated. I examined the resulting material using X-ray diffraction and scanning electron microscope microscopy and the optical properties were probed by measurement of reflection and transmission spectra. I also performed optical simulations based on the DDA. The results showed that the measured properties were consistent with the occurrence of a localized surface plasmon resonance, which proved that PtAl₂ could be used in plasmonic applications. Finally, I considered the example of a metallic alloy, in this case between Cu and Al. The high electron density of Al (three electrons per atom) was expected to be beneficial because addition of Al to Cu would increase the electron-to-atom ratio of the alloy. This would influence the electronic structure and subsequently the dielectric function and Fermi level. Techniques used included ellipsometry, spectrometry, XRD and SEM. Very good results were obtained for an alloy of Cu with 15 at% Al. I also looked at the effect of crystal structure by comparing γ Cu-Al phase in the metastable and stable states. Samples were deposited at room temperature by magnetron sputtering onto a glass substrate (metastable) then annealed at 500°C for 20 minutes (stable). There was a surprisingly big change in optical properties on going from the metastable to stable states, and a region of very low loss was identified in the spectrum. Overall, the work has proved very successful. While a means to suppress oxidation of Ag was not found, three promising new materials (PtAl₂, Cu-15 at.% Al, and Cu-Al γ-phase) were identified for future plasmonic applications.