Tesis sobre el tema "FeSiB"
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Henninger, Georg [Verfasser]. "Die strukturellen und physikalischen Eigenschaften weichmagnetischer dünner Einzel- und Multilagenschichten des FeSiB-CuNb-Legierungssystems / Georg Henninger". Aachen : Shaker, 2003. http://d-nb.info/1172610908/34.
Texto completoMattingley, Andrew David. "Sputter growth and characterisation of amorphous FeSiBC films". Thesis, University of Sheffield, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.268267.
Texto completoHamrit, Oussama. "Etude des pertes magnétiques dans les matériaux magnétiques destinés aux applications de transport en haute fréquence et sous champ bidirectionnel". Thesis, Université Paris-Saclay (ComUE), 2015. http://www.theses.fr/2015SACLN003/document.
Texto completoIron losses in electrical machine applications are of paramount importance, an approximate estimation of these losses can easily lead to a thermally unsustainable solution, in this context, it is essential to get exactly the magnetic characteristics of the magnetic materials used, moreover, with the recent interest for high speed electrical machines (high frequency), It is important to characterize magnetic materials at high frequency. In this work, a high frequency characterizing system (1 T - 10 kHz) under unidirectional field has been proposed and magnetic losses models has been studied and discussed. Magnetic fields in electrical machines could be alternative in one direction, elliptical or circular. In this context, a characterization under rotating field and a magnetic loss model has been proposed. Finally, when stator steel sheets are cut all in one piece, the cutting direction with regard to the rolling direction will change from one tooth pitch to another, for that a study of the FeSi non oriented anisotropy has been performed
McKinty, Colin N. "Characterisation of beta-FeSi2 fabricated by ion beam assisted deposition". Thesis, University of Surrey, 2001. http://epubs.surrey.ac.uk/842704/.
Texto completoDavies, Mark James. "The cytopathology of familial encephalopathy with neuroserpin inclusion bodies (FENIB)". Thesis, University of Cambridge, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.598334.
Texto completoHUET, SARAH D. P. "Estudo de interações hiperfinas em nanopartículas de Fesub(3)Osub(4) e Fesub(3)Osub(4) dopadas com gadolínio pela espectroscopia de correlação angular perturbada". reponame:Repositório Institucional do IPEN, 2014. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10616.
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Dissertação (Mestrado)
IPEN/D
Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
Gallo, Ivan Braga. "Estudo espectroscópico de filmes de SiFe". Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/76/76132/tde-14072010-150129/.
Texto completoMany compounds have been studied, in order to find new optoelectronic materials. Within the most interesting are those which show compatibility with the actual (micro)-electronic and/or telecommunications industry. In this context, silicon based compounds under thin films form have advantages to allow its integration and application on large scale. Motivated by these aspects, the present work reports the investigation of Si+Fe thin film system with emission in the infrared region. At this way, hydrogenated (a-Si:H) and hydrogen-free (a-Si) amorphous silicon films, doped with different iron concentrations, were deposited by the radio frequency sputtering technique. After the deposition process, the films were submitted to thermal annealing treatments (in an argon atmosphere) at 300, 450, 600, 750 and 900oC for 15min (cumulative), and at 800oC for 2h (not cumulative). The obtained samples were systematically investigated through different spectroscopic techniques: compositional (EDS Energy Dispersive X-Ray Spectroscopy), optical transmission in the visible-near infrared region (VIS NIR), Raman scattering and photoluminescence. The EDS measurements showed that, depending on the deposition conditions of the samples, the iron concentration in a-SiFe:H was ~ 10 times smaller than the present in the samples of a-SiFe. The optical transmission spectra indicated variations in the optical bandgap associated to Fe concentration and thermal annealing treatments. From Raman scattering measurements it was possible to verify that all films as deposited (AD) and annealed till 600oC for 15min have an amorphous structure. Thermal treatments at higher temperatures induce the silicon crystallization and the appearance of β-FeSi2 phase which is optically active in the infrared region. Finally, photoluminescence measurements showed that only the samples annealed at 800 ºC for 2h (a-SiFe:H doped with 0.08 at.% of Fe and a-SiFe doped with 0.79 at.% of Fe) have emission in the infrared region (~ 1500 nm). Among the probable reasons for the optic activity of these samples we have to take into account the combined effect of Fe concentration (and of β-FeSi2 crystallites) and its optic-structural characteristics.
Ali, Mannan. "Growth and study of magnetostrictive FeSiBC thin films for device applications". Thesis, University of Sheffield, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.310759.
Texto completoYounsi, Abdelaziz. "Elaboration et étude de l'épitaxie de beta-FeSi2 sur Si(111)". Aix-Marseille 2, 1993. http://www.theses.fr/1993AIX22053.
Texto completoTeichert, Steffen. "Elektrischer Transport und allgemeine Charakterisierung der halbleitenden Silicide Beta-FeSi2 und MnSi1,73". Doctoral thesis, Universitätsbibliothek Chemnitz, 1996. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-199600235.
Texto completoSharp, Lynda Karen. "The biochemical characterisation of mutants of neuroserpin that cause the dementia FENIB". Thesis, University of Cambridge, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.614202.
Texto completoLi, Fangfei [Verfasser] y Hartmut [Akademischer Betreuer] Wiggers. "Charge Storage Behavior of β-FeSi2 Nanoparticles / Fangfei Li ; Betreuer: Hartmut Wiggers". Duisburg, 2021. http://d-nb.info/123904870X/34.
Texto completoFeng, Xiaohua. "Etude des propriétés thermoélectriques des revêtements de matériaux de type β-FeSi2". Thesis, Belfort-Montbéliard, 2016. http://www.theses.fr/2016BELF0288/document.
Texto completoThe uncertainty in the global energy with the constant increase in energy demand triggers the search for energyconversion technologies with high efficiency. The thermoeletrical devices (TE) can play a relevant role in thecollection and recovery of energy because they can be used to recover waste heat. For example, the amount of heatemitted as waste by different ombustion engines is evaluated hundreds of millions of MWh / year.This thesis aims to demonstrate the feasibility of anufacturing heat recovery systems from waste on an industrialscale using thermoelectric generators (TE). The proposed manufacturing techniques are based on the use ofadvanced technologies such as spark plasma sintering, crushing, selective laser melting and thermal spraytechnology. These techniques make possible the development of thermoelectric material coatings with superiorthermoelectric performance and high flexibility related to multiple choices of sizes, shapes and materials.The study of semiconductor ß-FeSi2 material was conducted in this goal because it has a strong merit coefficient(ZT) in the temperature range of 300-800°C which is the temperature of the output gas of the cars.Selective Laser Melting, sintering and spark plasma sintering (SPS) were successively used to lead to themanufacture of ¿-FeSi2 alloy. The coatings were then obtained by low pressure plasma spraying.Concerning the coating formed from the alloy, the phase transformation of the cubic phase ¿-ferro-silicon and thetetragonal phase ¿-Fe2Si5 in the orthorhombic phase ß-FeSi2 is produced by obeying the eritectic and eutecticreactions. After annealing under suitable temperature and time, the coatings sprayed on the ceramic bstratepresent a complete phase ß-FeSi2.In view of a large-scale application, it is necessary to spray this type of coating on a stainless steel substrate and inthis case to use a suitable mask for making the appropriate thermoelectric device
Karlsson, Li Susanna Monika. "Structural characterisation of the conformational transitions of neuroserpin that underlie the dementia FENIB". Thesis, University of Cambridge, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.611426.
Texto completoRix, Wolfgang. "Über Eisensilicide Züchtung von b-FeSi2-Einkristallen durch chemischen Transport, strukturelle und physikalische Charakterisierung /". [S.l.] : [s.n.], 2001. http://deposit.ddb.de/cgi-bin/dokserv?idn=963796453.
Texto completoRix, Wolfgang. "Über Eisensilicide Züchtung von [beta]-FeSi2-Einkristallen durch chemischen Transport, strukturelle und physikalische Charakterisierung /". [S.l. : s.n.], 2001. http://deposit.ddb.de/cgi-bin/dokserv?idn=963796453.
Texto completoIngwersen, Thies Frieder [Verfasser]. "Using small chemical compounds to inhibit polymerization of neuroserpin in FENIB / Thies Frieder Ingwersen". Hamburg : Staats- und Universitätsbibliothek Hamburg Carl von Ossietzky, 2020. http://d-nb.info/122853778X/34.
Texto completoRix, Wolfgang. "Über Eisensilicide: Züchtung von ß-FeSi2-Einkristallen durch chemischen Transport, strukturelle und physikalische Charakterisierung". [S.l. : s.n.], 2001. http://www.bsz-bw.de/cgi-bin/xvms.cgi?SWB9403097.
Texto completoWalnum, Andreas. "Hurtigkobling for staketruck : Underlettelse av redskapsbytte for trucker benyttet i Ferrosilisiumsproduksjon hos Fesil Rana Metall". Thesis, Umeå universitet, Institutionen för tillämpad fysik och elektronik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-72673.
Texto completoRouve, Laure-Line. "Prise en compte du comportement magnétique fréquentiel des tôles FeSi en modélisation électrotechnique". Grenoble INPG, 1996. http://www.theses.fr/1996INPG0027.
Texto completoLe, Thanh Vinh. "Hétéroépitaxie du disiliciure semiconducteur de fer, beta-fesI#2, sur substrat silicum(111)". Aix-Marseille 2, 1992. http://www.theses.fr/1992AIX22014.
Texto completoYang, Zuoya. "An optical and structural study of ion beam synthesised Si/beta-FeSi2/Si (100) layered structures". Thesis, University of Surrey, 1996. http://epubs.surrey.ac.uk/843270/.
Texto completoViala, Bernard. "Propriétés mécaniques et magnétiques des rubans d'alliage FeSi6. 5% élaborés par solidification rapide sous atmosphère contrôlée". Toulouse, INSA, 1994. http://www.theses.fr/1994ISAT0035.
Texto completoThabethe, Sibongiseni Stanley. "Growth and characterization of FeSi nanowires by chemical vapor deposition for gas sensing applications". Thesis, University of the Western Cape, 2014. http://hdl.handle.net/11394/4239.
Texto completoFeSi nanowires were synthesized via a chemical vapor deposition method. Anhydrous FeCl3 powder in this case served as the Fe source and was evaporated at a temperature of 1100oC to interact with silicon substrates which served as the silicon source. The nanowires followed the vapor solid (VS) growth mechanism, which does not require the use of a metal catalyst; the native silicon oxide layer on the silicon substrates played the role of the catalyst in the growth of these nanostructures. A second growth mechanism, involving the use of a metal catalyst to assist in the growth of the nanowires was attempted by depositing a thin film of gold on silicon substrates. The reaction yielded SiOx nanowires; these results are discussed in detail in Chapter 5. All the nanostructures were characterized by X-ray diffraction (XRD), Transmission Electron Microscopy (TEM), Scanning Electron Microscopy (SEM), Photoluminescence Spectroscopy (PL), Raman Spectroscopy and Fourier Transform Infrared Spectroscopy (FTIR).
Teichert, Steffen. "Elektrischer Transport und allgemeine Charakterisierung der halbleitenden Silicide Beta-FeSi 2 und MnSi 1,73". [S.l. : s.n.], 1996. http://www.bsz-bw.de/cgi-bin/xvms.cgi?SWB10324503.
Texto completoDEMUNER, A. S. "O Efeito Magnetocalórico nos Compostos [(La,TR)FeSi]13, onde TR=Y ou Gd". Universidade Federal do Espírito Santo, 2008. http://repositorio.ufes.br/handle/10/4760.
Texto completoNeste trabalho, verificou-se experimentalmente o Efeito Magnetocalórico (EMC) (por quantificação da variação de entropia magnética (ΔSM)) nos compostos La(1-x)(TR)x[Fe0,88Si0,12]13, com 0,05 ≤ x ≤ 0,20, substituindo-se parcialmente os átomos de La por átomos de Y ou Gd (TR). As amostras obtidas foram caracterizadas por difração de raios-X (DRX), espectroscopia Mössbauer e medidas de magnetização em função da temperatura e do campo magnético. Estas últimas permitiram o cálculo do EMC, que foi avaliado em função da concentração x de Y ou Gd. Os resultados de DRX e de espectroscopia Mössbauer indicaram que as amostras se estabilizam na estrutura do tipo NaZn13, porém, acompanhadas pela formação de outras fases ricas em Fe (α-(Fe,Si) e LaFeSi). As medidas de magnetização em função da temperatura realizadas em campos baixos (0,05T) mostraram que, em todo o intervalo composicional estudado (0,05 ≤ x ≤ 0,20), os compostos (La,TR)[Fe0,88Si0,12]13 (TR= Y ou Gd) apresentam uma transição magnética (Ferromagnético → Paramagnético) a uma temperatura, TC, abaixo da temperatura ambiente. Por outro lado, observou-se nas medidas de magnetização em função do campo magnético aplicado, que para certas concentrações de Y ou Gd (x= 0,05 (Y); x= 0,05 e 0,20 (Gd)), as curvas passam a apresentar um comportamento característico de uma transição metamagnética induzida por campo. Na série do composto La(1-x)Yx[Fe0,88Si0,12]13, o valor máximo da ΔSM encontrado, para um campo de 5T, foi de -20,2 J/kg.K a uma faixa de temperatura T= 18,3 K, referente à amostra com x=0,05. Com relação à série do composto La(1-x)Gdx[Fe0,88Si0,12]13, o valor encontrado foi de ΔSM= -21,0 J/kg.K a uma faixa de temperatura T= 19,1 K, referente à amostra com x=0,20. Esses resultados (ΔSM) são atribuídos à transição metamagnética induzida pelo campo, conforme observado nos gráficos de Arrot (M2 em função de H/M).
Lefki, Karim. "Propriétés optiques, électriques et photoélectriques de couches minces de siliciure de fer semiconducteur [bêta]-FeSi2 sur silicium". Grenoble 1, 1992. http://www.theses.fr/1992GRE10077.
Texto completoLEBOURG, CYRIL. "Alliages fesi (3 a 7,8%) rapidement solidifies : contribution a l'etude des proprietes mecaniques et magnetiques". Toulouse, INSA, 1999. http://www.theses.fr/1999ISAT0013.
Texto completoORLIONNET-RESZETKO, VERONIQUE. "Possibilites de formation de la texture de goss dans des materiaux fesi elabores par solidification rapide*". Paris 6, 1991. http://www.theses.fr/1991PA066708.
Texto completoLang, Rossano. "Nanoestruturas luminescentes ß-FeSi 2 produzidas pela técnica de implantação e irradiação iônica : caracterização estrutural e óptica". reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2009. http://hdl.handle.net/10183/28174.
Texto completoIn this work, we present a systematic study of the structural and optical properties of FeSi2 nanoparticles, synthesized in SiO2/Si matrix by ion implantation, followed by ion beam induced epitaxial crystallization (IBIEC) and several thermal treatments under 95 % N2 - 5 % H2 atmosphere. Each step of the syntheses process, the formation and growth of the FeSi2 nanoparticles, as well as the damage production, were structurally characterized and correlated with their light emission properties. For purposes of interpreting the results, a set of samples containing Ni was synthesized in the same experimental conditions that the Fe samples and their structural and optical properties were also studied. Through IBIEC recrystallization process, important informations were obtained about vibrational properties of the metallic γ-FeSi2 phase and its metastability when formed at low Fe concentration. In particular, the phase transition from γ-FeSi2 to semiconducting β-FeSi2 via annealing treatment was investigated in detail. Furthermore, the nature of the energy fundamental gap of the semiconductor compound was also evaluated. Thermal treatment experiments at different temperatures showed that concomitantly to the formation and growth of the semiconducting nanoparticles, there is a complex evolution of the optically active defects. According to the annealing temperature, photoluminescence (PL) bands in the near-infrared spectral region (0.7 eV - 0.9 eV) with different intensities and morphologies were detected at 2 K. Based on the structural and optical characterization results of the SiO2/Si + FeSi2 nanoparticles, combined with the comparative experimental PL results of the metallic NiSi2 compound formation, the physical origin of the distinct observed luminescence were discriminated in terms of intrinsic emissions of the semiconducting β-FeSi2 and specific types of defects in the Si matrix, that acts as radiative recombination centers.
Maltez, Rogério Luis. "Estudos da formação, estabilidade e ordenamento da fase gamma FeSi 2 produzida pela técnica de implantação iônica". reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 1996. http://hdl.handle.net/10183/31455.
Texto completoANDRIAMIFIDY, JEAN-LUC. "Contribution a l'etude de l'influence de l'heterogeneite du champ magnetique sur les pertes dans les toles fesi". Paris, CNAM, 1995. http://www.theses.fr/1995CNAM0210.
Texto completoGUILHERME, ENEIDA da G. "Estudo do processo de obtencao da liga magnetica NDsub(15) FEsub(77) Bsub(8) por reducao-difusao (R/D) calciotermica". reponame:Repositório Institucional do IPEN, 1992. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10285.
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Disserta‡ao (Mestrado)
IPEN/D
Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
Abou, Mourad Houssam. "Metallic to insulating transition in disordered pulsed laser deposited silicide thin films". [Tampa, Fla.] : University of South Florida, 2005. http://purl.fcla.edu/fcla/etd/SFE0001000.
Texto completoNencib, Nadim. "Conception et validation d'un dispositif de caractérisation magnétique sous excitation bidimensionnelle : comportement des toles FeSi en champ tournant". Grenoble INPG, 1994. http://www.theses.fr/1994INPG0109.
Texto completoThoumire, Olivier. "Influence de la nitruration en lit fluidisé sur les propriétés structurales, mécaniques et magnétiques d'alliages FeSi et FeSiAl". Rouen, 1999. http://www.theses.fr/1999ROUES003.
Texto completoOberhauser, Felix [Verfasser] y Markus [Akademischer Betreuer] Glatzel. "Beteiligung von OS-9 an der ER-assoziierten Degradation (ERAD) bei familiärer Enzephalopathie mit Neuroserpin-Einschlüssen (FENIB) / Felix Oberhauser. Betreuer: Markus Glatzel". Hamburg : Staats- und Universitätsbibliothek Hamburg, 2014. http://d-nb.info/1055040323/34.
Texto completoJursic, Ivan [Verfasser] y J. [Akademischer Betreuer] Schoenes. "Mikro-Raman Untersuchungen an FeSi unter Druck bis 34GPa sowie an SmFeAsO0,8F0,2 und EuFe2As2 unter Normaldruck / Ivan Jursic ; Betreuer: J. Schoenes". Braunschweig : Technische Universität Braunschweig, 2014. http://d-nb.info/1175820245/34.
Texto completoSchipanski, Angela [Verfasser] y Markus [Akademischer Betreuer] Glatzel. "Mechanism of neuronal death in familial encephalopathy with neuroserpin inclusion bodies (FENIB) : Implications for mutant neuroserpin degradation ; a study in mus musculus / Angela Schipanski. Betreuer: Markus Glatzel". Hamburg : Staats- und Universitätsbibliothek Hamburg, 2011. http://d-nb.info/1020458119/34.
Texto completoTACCOEN, ALAIN. "Caracterisation des premiers stades de croissance du fer et du -fesi#2 sur la surface (111) du silicium par ondes stationnaires de rayons x et microscopie electronique en transmission". Paris 6, 1993. http://www.theses.fr/1993PA066252.
Texto completoGiedigkeit, Rainer. "Strukturelle Ordnung und Unordnung in binären und ternären Verbindungen des Galliums mit Ytterbium und Palladium". Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2008. http://nbn-resolving.de/urn:nbn:de:bsz:14-ds-1201464467941-38198.
Texto completoGiedigkeit, Rainer. "Strukturelle Ordnung und Unordnung in binären und ternären Verbindungen des Galliums mit Ytterbium und Palladium". Doctoral thesis, Technische Universität Dresden, 2007. https://tud.qucosa.de/id/qucosa%3A24059.
Texto completoLippi, Silvio. "Analysis of rotor eddy-current losses in synchronous motors". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2022.
Buscar texto completoMaijó, Ferré Irene. "Preconcentration strategies in capillary electrophoresis for the determination of pharmaceutical and personal care products". Doctoral thesis, Universitat Rovira i Virgili, 2012. http://hdl.handle.net/10803/84043.
Texto completoThe main objective of this Doctoral Thesis is the development of different strategies to decrease the detection limits of capillary electrophoresis for the determination of pharmaceutical and personal care products. These strategies are based on electrophoretic and chromatographic preconcentration techniques, and the use of mass spectrometry as a detection system. The electrophoretic preconcentration techniques studied included sample stacking techniques and sweeping while the chromatographic preconcentration technique evaluated was in-line coupling between solid phase extraction and capillary electrophoresis. With respect to PPCPs, this Doctoral Thesis focuses specifically on non-steroidal anti-inflammatory drugs (NSAIDs), parabens and UV-filters. Another objective of this Doctoral Thesis is to study the suitability of the developed methodologies for the determination of PPCPs in environmental samples.
Wei-JieHuang y 黃韋傑. "Synthesis and properties of morphology-improved single crystalline FeSi and β-FeSi2 nanowires". Thesis, 2014. http://ndltd.ncl.edu.tw/handle/qn6j62.
Texto completoChen, Chih-Wei y 陳志偉. "Synthesis and Properties of the β-FeSi2 and ε-FeSi Nanowires by Oxide Assisted Growth Method". Thesis, 2011. http://ndltd.ncl.edu.tw/handle/59550264757787925877.
Texto completo國立清華大學
材料科學工程學系
99
Transition metal silicide nanowires compose a highly broad set of refractory materials that are promising materials that are currently used for many applications including CMOS devices, thin film coatings, bulk structural components, electrical heating elements, photovoltaics, thermoelectric and spintronics. Semiconducting silicides have been extensively investigated for silicon-based optoelectronics such as LEDs and IR detectors. The narrow bandgap semiconducting silicides, in particular CrSi2, β-FeSi2, MnSi1.8, and ReSi1.75, have been targeted and used for robust, stable, and inexpensive thermoelectric materials, and have shown potential for photovoltaic applications. β-FeSi2 is a silicon-rich phase with a orthorhombic structure (space group Cmca) that has direct-bandgap . It allows for making light-emitting devices which operate at 1.5mm that incorporate β-FeSi2 into a conventional silicon bipolar junction. ε-FeSi is a metallic material with a cubic structure (space group P213) that has been classified as a Kondo insulator. It has attracted interest for over half a century, mainly because of its unusual magnetic behavior. β-FeSi2 and ε-FeSi nanowires were produced on silicon substrates covered with a thick layer of silicon oxide through the decomposition of the double-source precursor FeCl3 and SiO in a Oxygen Assisted Growth (OAG) process. Unlike typical Vapor-Liquid-Solid (VLS) NWs growth, The NWs form without the addition of metal catalysts had no catalyst tips. The morphologies and structure of NWs were confirmed by X-ray diffraction (XRD), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). SEM shows that the diameter of the NWs is below 100nm and the length of NWs is tens of micrometers. XRD reveals that samples can grow in single phase or in double phase NWs depending on the growth temperature. Energy spectroscopy for chemical analysis (ESCA) shows the NWs are covered a thick SiO2 layer. TEM results indicate that the NWs growth is along the low index plane. We also have fabricated two-terminal electrical devices of β-FeSi2 and ε-FeSi NWs, and they exhibited average resistivity about 2000μΩ.cm and 250μΩ.cm. We found that the resistivity decreases stepwise as the NWs is thinned in semiconducting nanowires. In conclusion, we have successfully synthesized freestanding single-crystalline nanowires of β-FeSi2 and ε-FeSi by OAG method. This shows that semiconducting and metallic NWs will prove to be promising materials in future nanotechnology.
Tsai, Feng-Tsai y 蔡豐在. "Design and Analysis of -FeSi2 Quantum Dots". Thesis, 2004. http://ndltd.ncl.edu.tw/handle/90971686264837426058.
Texto completo義守大學
電子工程學系
92
With a direct band gap of ~0.87 eV, β-FeSi2 possesses a great potential for the realization of integrated Si optoelectronic devices. Thus, using β-FeSi2 quantum dots as light emitting materials in the active layer and Si-based layered media as cavity reflectors to design the RCLED and RC2LED device structures are proposed in this thesis. The extraction efficiency is the key performance figure for high-efficiency LEDs. The spontaneous emission is modeled as an electric dipole. In this thesis, the extraction efficiency is calculated by using E-field reflection coefficients for both TE and TM modes. A simulation program has been developed to analyze device structure (such as active layer thickness, source positions, and reflector structures) and calculate the optimal cavity thickness correction and extraction efficiency. The extraction efficiency about 51% can be obtained by using β-FeSi2 quantum dots as the active layer and poly-Si/Si3N4 DBR as cavity reflectors and about 48% for the RC2LED structure.
Wu, Geng-Tong y 吳耿同. "Simulation and Analysis of β-FeSi2 LED". Thesis, 2006. http://ndltd.ncl.edu.tw/handle/24482201414219379794.
Texto completo義守大學
電子工程學系碩士班
94
The light-emitting devices are all fabricated by using Ⅲ-Ⅴ compound materials at the present day. However, the lattice constants of Ⅲ-Ⅴcompound materials are different from Si material, therefore the light-emitting devices can not integrate with Si chips. Recently, light emission from Si has been showed to be possible when the Si in the from of a low-dimensional system or when selected active impurities (such as erbium) and/or new phases (such as β-FeSi2). So far the studies of β-FeSi2 by many scholars have been focused on the investigation of its optical and electrical properties to find out the optimum thin film growth conditions. The theoretical investigation of β-FeSi2 light-emitting devices has not been reported. Thus, various laser diode structures (such as edge-emitting diode and surface-emitting diode) by using β-FeSi2 film as the action layer will be designed and analyzed in this proposal. First, the gain of β-FeSi2 /Si double heterostructure laser will be calculated. Then, the steady state solution of the rate equations will be solved to investigate the threshold characteristics and output power of β-FeSi2 /Si laser. The transient solutions of the rate equations will be calculated by using Analytic Solution to analyze the dynamic effects, frequency response and turn-on delay behavior of β-FeSi2 /Si laser, The analysis of rate equations can investigate the key factors that dominate the β-FeSi2/Si laser performances, These results can be used to fabricate the optimum β-FeSi2/Si laser structures.
"Phase and microstructure of FeSi₂ thin films". 2006. http://library.cuhk.edu.hk/record=b5892816.
Texto completoThesis (M.Phil.)--Chinese University of Hong Kong, 2006.
Includes bibliographical references (leaves 63-65).
Text in English; abstracts in English and Chinese.
Chong Yuen Tung = Gui hua tie bo mo de xiang he wei guan jie gou / Zhuang Wantong.
Abstract --- p.i
摘要 --- p.ii
Acknowledgment --- p.iii
Table of contents --- p.iv
List of Figures --- p.viii
List of Tables --- p.x
Chapter CHAPTER 1: --- Introduction --- p.1
Chapter CHAPTER 2: --- Background --- p.4
Chapter 2.1 --- Phases of crystalline FeSi2 --- p.4
Chapter 2.2 --- Electronic structure of β-FeSi2 --- p.7
Chapter 2.3 --- Orientation relationship between β-FeSi2 and Si --- p.8
Chapter CHAPTER 3: --- Instrumentation --- p.10
Chapter 3.1 --- Metal vapor vacuum arc ion source implantation --- p.10
Chapter 3.2 --- Rutherford backscattering --- p.12
Chapter 3.3 --- Transmission Electron Microscopy (TEM) --- p.13
Chapter 3.3.1 --- Principles of TEM --- p.13
Chapter 3.3.2 --- Electron specimen interaction and contrast --- p.14
Chapter 3.3.3 --- Electron Diffraction --- p.15
Chapter 3.3.4 --- Sample Preparation --- p.17
Chapter 3.3.4.1 --- Plan-view sample --- p.17
Chapter 3.3.4.2 --- Cross-section sample --- p.17
Chapter CHAPTER 4: --- FeSi2 films fabricated by ion implantation --- p.18
Chapter 4.1 --- Introduction --- p.18
Chapter 4.2 --- Experimental details --- p.18
Chapter 4.3 --- Ion energy series --- p.19
Chapter 4.3.1 --- As-implanted sample --- p.19
Chapter 4.3.1.1 --- Results --- p.20
Chapter 4.3.1.2 --- Discussions --- p.20
Chapter 4.3.2 --- Annealed samples --- p.24
Chapter 4.3.2.1 --- Morphology of the annealed samples and the damage on Si substrate --- p.24
Chapter 4.3.2.2 --- Identification of the FeSi2 phase and their orientation relationship with the Si matrix --- p.24
Chapter 4.3.2.3 --- Photoluminescence of the samples --- p.26
Chapter 4.3.2.4 --- Discussions --- p.26
Chapter 4.4 --- Ion dosage series --- p.31
Chapter 4.4.1 --- Results --- p.31
Chapter 4.4.2 --- Discussions --- p.32
Chapter 4.5 --- Summary --- p.36
Chapter CHAPTER 5: --- Effect of post annealing on the phase and microstructure of FeSi2 --- p.37
Chapter 5.1 --- Introduction --- p.37
Chapter 5.2 --- Experimental details --- p.37
Chapter 5.3 --- The correlation between microstructure of FeSi2 synthesized under different annealing conditions and their PL --- p.38
Chapter 5.3.1 --- RTA series --- p.38
Chapter 5.3.1.1 --- Results --- p.38
Chapter 5.3.1.2 --- Discussions --- p.39
Chapter 5.3.2 --- FA series --- p.42
Chapter 5.3.2.1 --- Results --- p.42
Chapter 5.3.2.2 --- Discussions --- p.44
Chapter 5.3.3 --- RTAFA series --- p.45
Chapter 5.3.3.1 --- Results --- p.45
Chapter 5.3.3.2 --- Discussions --- p.45
Chapter 5.4 --- The existence of alpha phase and its special shape --- p.51
Chapter 5.4.1 --- Results --- p.51
Chapter 5.4.2 --- Discussions --- p.52
Chapter 5.5 --- The existence of gamma phase in 1050°C furnace annealed sample
Chapter 5.5.1 --- Results --- p.56
Chapter 5.5.2 --- Discussions --- p.57
Chapter 5.6 --- Summary --- p.59
Chapter CHAPTER 6: --- Conclusions --- p.61
References --- p.63
Chih-YungYang y 楊智詠. "Synthesis and properties of single-crystalline β-FeSi2 nanowires". Thesis, 2013. http://ndltd.ncl.edu.tw/handle/7z2fyj.
Texto completo國立成功大學
材料科學及工程學系碩博士班
101
In this study, self-catalyzed β-FeSi2 nanowires were synthesized via chemical vapor deposition method where the fabrication of β-FeSi2 nanowires occurred on Si(100) substrates through the decomposition of the single-source precursor of anhydrous FeCl3 powders. We carefully varied temperatures, duration time and the flow rates of carrier gases to control and investigate the growth of the nanowires. we can find that β-FeSi2 nanowires grow at about 750 ℃~ 850 ℃ and they are longer and thinner with increasing temperature . The number of nanowires was found fewer at higher gas flow rate, and the flow is less than 50sccm may have different phases appear. It is found that the longer duration time makes longer nanowires. β-FeSi2 in the PL IR spectra test can be found that there is a peak at 1380nm, it can be used as a light-emitting diode applications.The magnetism of β-FeSi2 nanowires is interesting as the result of various dimensions with different futures. β-FeSi2 bulk is non-magnetic,thin film ferromagnetic only below 100K, and in the magnetic analysis , there are room temperature ferromagnetic properties at the β-FeSi2 nanowires. In the field emission measurements, β-FeSi2 were good field emission materials.