Дисертації з теми "Fluoride glasses Thermal properties"
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Lima, Sandro Marcio. "Aplicações da técnica de lente térmica em materiais ópticos." Universidade de São Paulo, 1999. http://www.teses.usp.br/teses/disponiveis/76/76132/tde-12092007-174322/.
Повний текст джерелаIn this work the Thermal Lens (TL) technique was used to determine the absolute values of the thermal diffusivity (D), thermal conductivity (K) and temperature coefficient of the optical path length (ds/dT) of fluoride, chalcogenide, chalcohalide (chalcogenides and halides mixture) and calcium aluminate glass and of a fluoride cristal. These measurements were developed at ambient temperature and near Tg for some samples. For the ZBLAN glass, we performed the TL experiment from ambient to ~ 330°C, observing na abrupt decrease on D close to the glass transition temperature (Tg ~ 290°C). We also applied the TL technique to determine the fluorescence quantum efficiency of Nd+3 doped ZBLAN. The usefulness of this technique to determine thermo-optical properties of transparent materials as a function of the temperature was demonstrated.
McDougall, James. "Spectroscopic properties of rare earth ions in zirconium based fluoride glasses." Thesis, University of the West of Scotland, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.261598.
Повний текст джерелаAksel, Cemail. "Thermal shock behaviour and mechanical properties of magnesia-spinel composites." Thesis, University of Leeds, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.275609.
Повний текст джерелаLiao, Hao-Hsiang. "Thermal and thermoelectric properties of nanostructured materials and interfaces." Diss., Virginia Tech, 2012. http://hdl.handle.net/10919/19198.
Повний текст джерелаPh. D.
Ràfols, Ribé Joan. "Organic vapour-deposited stable glasses: from fundamental thermal properties to high-performance organic light-emitting diodes." Doctoral thesis, Universitat Autònoma de Barcelona, 2017. http://hdl.handle.net/10803/457956.
Повний текст джерелаPhysical vapour deposition has recently emerged as an alternative route to prepare glasses that span a broad range of stabilities, together with other features. Particularly, it is possible to achieve glasses with properties that outperform conventional glasses, and that would otherwise require times from tenths to several thousands of years of slowly-cooling or ageing. For this reason, these glasses are referred as highly stable glasses or ultrastable glasses. In particular, it has been shown that for many molecular organic glass-formers, the deposition temperature plays a crucial role in determining glass properties, such as thermal stability, density or molecular orientation among others, giving the possibility to enhance the inherent instability of glasses. Vapour-deposited glasses offer new insights into the glass transition phenomenon but also potential applications in many technological processes such as in organic electronics. This work is committed to further deepen the knowledge on vapour-deposited glasses using organic semiconductor materials. We use two silicon nitride membrane-based techniques---fast-scanning quasi-adiabatic nanocalorimetry and the 3ω-Völklein method---to characterise several facets of these glasses. Firstly, we show that the most stable amorphous films are obtained when evaporated at 85 % of its corresponding glass transition temperature (). Secondly, we show how vapour-deposited films transform into the supercooled liquid via a propagating growth front that starts at the highly-mobile regions (surface and interfaces). The characteristics of this mechanism are examined and rationalised regarding the different glass properties. Thirdly, we demonstrate how this heterogeneous transformation can be effectively suppressed when the high-mobility interface is capped with a lower mobility layer, gaining access to the bulk transformation. We see how the kinetic stability of the capped layers is improved using this strategy. After characterising the glass transition, we look at the thermal conductivity of these glasses. We observe how the in-plane thermal conductivity changes with the deposition temperature and we attribute this behaviour to variations in the molecular alignment. Finally, we present a simple phosphorescent organic light-emitting diode device (OLED), consisting only of two organic layers, to check the influence of the deposition temperature on the device performance. We demonstrate how its efficiency and lifetime are enhanced when its functional layers are evaporated at 0.85. These results are achieved considering only the glass transition temperature and, therefore, they could be generalised to any OLED device. This work contributes to the existing knowledge of vapour-deposited glasses by providing new insights into their thermal properties and devitrification mechanisms and by exploring their potential application in the state-of-the-art OLED devices.
Stabler, Christina [Verfasser], Emanuel [Akademischer Betreuer] Ionescu, and Martin [Akademischer Betreuer] Heilmaier. "Mechanical and Thermal Properties of SiOC-based Glasses and Glass Ceramics / Christina Stabler ; Emanuel Ionescu, Martin Heilmaier." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2019. http://d-nb.info/1187444359/34.
Повний текст джерелаHudl, Matthias. "Magnetic materials with tunable thermal, electrical, and dynamic properties : An experimental study of magnetocaloric, multiferroic, and spin-glass materials." Doctoral thesis, Uppsala universitet, Fasta tillståndets fysik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-168986.
Повний текст джерелаWang, Ninghua. "Evidence for the Intermediate Phase in Bulk (K2O)x(GeO2)1-x glasses and its consequences on Electrical and Thermal Properties." University of Cincinnati / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1187020710.
Повний текст джерелаGrema, Lawan Umar. "The effects of composition on the thermal, mechanical and electrical properties of alumino-borosilicate sealing glasses for solid oxide fuel cell (SOFC) applications." Thesis, University of Sheffield, 2018. http://etheses.whiterose.ac.uk/15649/.
Повний текст джерелаCardoso, Celso Xavier. "Propriedades ópticas de vidros de fluoretos de indio e zircônio puros e dopados com Nd ou Pr." Universidade de São Paulo, 1992. http://www.teses.usp.br/teses/disponiveis/54/54132/tde-19032009-102145/.
Повний текст джерелаWe present a new class of heavy metals fluoride glasses (HMF) of InSrBaZnGdNa and InSrBaZnGaNa compositions. We have realized a study of the physical properties such as refraction index, characteristic temperatures, stability and optical properties such as absorption, emission, lifetime of pure, Nd or Pr doped glasses. These properties are similar to those obtained for glasses of ZrBaLaAlNa (ZBLAN) composition. The main characteristic of pure indium fluoride glasses is their larger transmission window in the infrared region (8330 nm) compared to ZBLAN composition (6650 nm). Rare earth doped glasses are promising materials for the development of glasses laser with emission in the 1050-1320 nm range (Nd) and 1320 nm (Pr), as well as optical amplifiers for telecommunication in the optical window centered at 1300 nm, as prominent emission bands are located at 1315 nm (InSBZnGdN), 1317 nm (InSBZnGdN:Nd) and 1320 nm (InSBZnGdN:Pr).
Kart, Hasan Huseyin. "Molecular Dynamics Study Of Random And Ordered Metals And Metal Alloys." Phd thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/12605467/index.pdf.
Повний текст джерелаSANTOS, IVANILDO A. dos. "Avaliação dos diagramas de fase do sistema LiF-GdF3-LuF3 utilizando termodinâmica computacional." reponame:Repositório Institucional do IPEN, 2012. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10174.
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Tese (Doutoramento)
IPEN/T
Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
Sidel, Salmo Moreira. "Síntese e caracterização de vidros teluritos /." Ilha Solteira: [s.n.], 2011. http://hdl.handle.net/11449/100885.
Повний текст джерелаBanca:João Carlos Silos Moraes
Banca: Valmor Roberto Mastelaro
Banca: Mauro Luciano Baesso
Banca: Tomaz Catunda
Resumo: O desenvolvimento de sistemas e dispositivos ópticos deu origem à área hoje conhecida como fotônica. A busca por novas aplicações ou aprimoramento de sistemas optoeletrônicos tem levado à obtenção de novos materiais vítreos, os quais exigem minuciosa investigação com relação às suas propriedades físicas. Entre os vários sistemas vítreos estudados, os vidros teluritos destacam-se como um dos mais promissores vidros óxidos já desenvolvidos quando comparados com outros vidros clássicos, como os vidros silicatos, fosfatos e boratos. Desta forma, neste trabalho foram preparados vidros com diferentes composições para o sistema Li2O-TeO2-R (R: WO3 e Nb2O5), e caracterizados usando técnicas de análises térmicas, estruturais e ópticas. O estudo das propriedades térmicas é importante na determinação e entendimento do mecanismo de nucleação e crescimento de cristais, sendo, essencial este conhecimento quando o intuito for preparar vidros de alta qualidade exigidos para aplicações tecnológicas. O desenvolvimento tecnológico destes vidros requer que a nucleação intrínseca e o crescimento de cristais sejam suficientemente reduzidos para evitar perdas ópticas. O estudo estrutural destes vidros também é importante para determinação das unidades estruturais constituintes dos vidros. Sabe-se que a adição de metais de transição na matriz telurito provoca a diminuição das unidades TeO3 e aumenta as TeO4, assim, causando aumento da densidade do vidro e, conseqüentemente, aumento no índice de refração. As técnicas utilizadas foram as de análise térmica (DSC), FTIR, XRD, lente térmica (LT) e método de ângulo de Brewster para a obtenção do índice de refração
Abstract: The development of optical systems and devices is the area known as photonics. The search for new applications or improvements of optoelectronic systems has led to the obtaining of new glassy materials, which require thorough investigation with respect to their physical properties. Among the various glass systems studied, the tellurite glasses are presented as one of the most promising oxide glasses that have been developed, when compared with other classics glasses like silicates, phosphates and borates. Thus, in this work were prepared with different glass compositions for the system Li2O-TeO2-R (R: WO3 and Nb2O5) and characterized using techniques of thermal analysis, structural and optical properties. The study of thermal properties is important in determining and understanding the mechanism of nucleation and crystal growth and this knowledge is essential when the purpose is to prepare high-quality glasses required for technological applications. The technological development of these glasses demands sufficiently low intrinsic nucleation and crystal growth to avoid optics losses. The structural study of these glasses is also important for determining the structural units constituting the glass. It is known that the addition of transition metals in the tellurite glass matrix causes a decrease in the TeO3 and increases the TeO4 units and thus causing the increased of density of the glass and, consequently, increasing the refractive index. The techniques used were differential scanning calorimetry (DSC), Fourier transform infrared spectroscopy (FTIR), X-ray powder diffraction (XRD) and thermal lens (TL) and Brewster angle method for obtaining the refractive index
Doutor
Sidel, Salmo Moreira [UNESP]. "Síntese e caracterização de vidros teluritos." Universidade Estadual Paulista (UNESP), 2011. http://hdl.handle.net/11449/100885.
Повний текст джерелаCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
O desenvolvimento de sistemas e dispositivos ópticos deu origem à área hoje conhecida como fotônica. A busca por novas aplicações ou aprimoramento de sistemas optoeletrônicos tem levado à obtenção de novos materiais vítreos, os quais exigem minuciosa investigação com relação às suas propriedades físicas. Entre os vários sistemas vítreos estudados, os vidros teluritos destacam-se como um dos mais promissores vidros óxidos já desenvolvidos quando comparados com outros vidros clássicos, como os vidros silicatos, fosfatos e boratos. Desta forma, neste trabalho foram preparados vidros com diferentes composições para o sistema Li2O-TeO2-R (R: WO3 e Nb2O5), e caracterizados usando técnicas de análises térmicas, estruturais e ópticas. O estudo das propriedades térmicas é importante na determinação e entendimento do mecanismo de nucleação e crescimento de cristais, sendo, essencial este conhecimento quando o intuito for preparar vidros de alta qualidade exigidos para aplicações tecnológicas. O desenvolvimento tecnológico destes vidros requer que a nucleação intrínseca e o crescimento de cristais sejam suficientemente reduzidos para evitar perdas ópticas. O estudo estrutural destes vidros também é importante para determinação das unidades estruturais constituintes dos vidros. Sabe-se que a adição de metais de transição na matriz telurito provoca a diminuição das unidades TeO3 e aumenta as TeO4, assim, causando aumento da densidade do vidro e, conseqüentemente, aumento no índice de refração. As técnicas utilizadas foram as de análise térmica (DSC), FTIR, XRD, lente térmica (LT) e método de ângulo de Brewster para a obtenção do índice de refração
The development of optical systems and devices is the area known as photonics. The search for new applications or improvements of optoelectronic systems has led to the obtaining of new glassy materials, which require thorough investigation with respect to their physical properties. Among the various glass systems studied, the tellurite glasses are presented as one of the most promising oxide glasses that have been developed, when compared with other classics glasses like silicates, phosphates and borates. Thus, in this work were prepared with different glass compositions for the system Li2O-TeO2-R (R: WO3 and Nb2O5) and characterized using techniques of thermal analysis, structural and optical properties. The study of thermal properties is important in determining and understanding the mechanism of nucleation and crystal growth and this knowledge is essential when the purpose is to prepare high-quality glasses required for technological applications. The technological development of these glasses demands sufficiently low intrinsic nucleation and crystal growth to avoid optics losses. The structural study of these glasses is also important for determining the structural units constituting the glass. It is known that the addition of transition metals in the tellurite glass matrix causes a decrease in the TeO3 and increases the TeO4 units and thus causing the increased of density of the glass and, consequently, increasing the refractive index. The techniques used were differential scanning calorimetry (DSC), Fourier transform infrared spectroscopy (FTIR), X-ray powder diffraction (XRD) and thermal lens (TL) and Brewster angle method for obtaining the refractive index
Joshi, Sameehan Shrikant. "Non-Isothermal Laser Treatment of Fe-Si-B Metallic Glass." Thesis, University of North Texas, 2017. https://digital.library.unt.edu/ark:/67531/metadc1062821/.
Повний текст джерелаPattanayak, Pulok. "Thermal And Electrical Properties Of Silver And Iodine Doped Chalcogenide Glasses." Thesis, 2008. http://hdl.handle.net/2005/865.
Повний текст джерелаStabler, Christina. "Mechanical and Thermal Properties of SiOC-based Glasses and Glass Ceramics." Phd thesis, 2019. https://tuprints.ulb.tu-darmstadt.de/8684/7/Dissertation_Christina_Stabler_ULB.pdf.
Повний текст джерелаShah, Minalben B. "Thermodynamis and kinetics of Zr₅₈̣₅Cu₁₅̣₆Ni₁₂̣₈Al₁₀̣₃Nb₂̣₈ bulk metallic glass forming alloy." Thesis, 2003. http://hdl.handle.net/1957/30229.
Повний текст джерелаShadowspeaker, Ludi A. "On the fragility and equilibrium phases of metallic glass forming alloys." Thesis, 2003. http://hdl.handle.net/1957/30817.
Повний текст джерелаKuno, Masahiro. "Thermodynamics of the Pd������Ni������Cu������P������ metallic glass-forming alloy." Thesis, 2001. http://hdl.handle.net/1957/33084.
Повний текст джерелаGraduation date: 2001
"Glass forming ability of metallic alloys =: 金屬合金的玻璃化能力". Chinese University of Hong Kong, 1996. http://library.cuhk.edu.hk/record=b5888950.
Повний текст джерелаThesis (M.Phil.)--Chinese University of Hong Kong, 1996.
Includes bibliographical references.
by Chua Lai Fei Joseph.
ACKNOWLEDGMENTS --- p.2
ABSTRACT --- p.3
Chapter CHAPTER 1: --- INTRODUCTION --- p.5
Chapter 1.1 --- METALLIC GLASS --- p.5
Chapter 1.2 --- SOLIDIFICATION PROCESS OF AN ALLOY --- p.7
Chapter 1.2.1 --- COOLING PATH --- p.7
Chapter 1.2.2 --- FREE VOLUME MODEL --- p.8
Chapter 1.2.3 --- NUCLEATION --- p.9
Chapter 1.2.4 --- LIQUID PHASE SEPARATION --- p.10
Chapter 1.3 --- IDEAS ON SOME CHARACTERISTIC PARAMETER OF GLASS AND GLASS FORMING ABILITY OF AN METALLIC ALLOY --- p.11
Chapter 1.3.1 --- CORRELATION FOR THE EXPANSION COEFFICIENT AND THE GLASS TRANSITION TEMPERATURE --- p.11
Chapter 1.3.2 --- CORRELATION FOR THE GLASS FORMING ABILITY WITH CRYSTALLINE COMPOUNDS/SOLID-SOLUTIONS --- p.12
REFERENCES --- p.13
Chapter CHAPTER 2: --- EXPERIMENTAL --- p.17
Chapter 2.1 --- SAMPLE PREPARATION --- p.17
Chapter 2.2 --- EXPERIMENTAL DETAILS FOR ALPHA MEASUREMENT --- p.17
Chapter 2.3 --- EXPERIMENTAL DETAILS FOR FINDING EQUILIBRIUM PHASES AND GLASS FORMING ABILITY OF AN ALLOY --- p.20
Chapter 2.3.1 --- FINDING EQUILIBRIUM PHASES --- p.20
Chapter 2.3.2 --- FINDING GLASS FORMING ABILITY --- p.21
Chapter CHAPTER 3: --- CORRELATION FOR THERMAL EXPANSION COEFFICIENTS OF MOLTEN GLASS FORMING SYSTEMS --- p.28
REFERENCES --- p.37
Chapter CHAPTER 4: --- CORRELATION FOR THE GLASS FORMING ABILITY OF PD83.5-XCUXSI16.5 WITH CRYSTALLINE COMPOUNDS/SOLID- SOLUTIONS --- p.38
Chapter 4.1 --- INTRODUCTION --- p.39
Chapter 4.2 --- EXPERIMENTAL --- p.39
Chapter 4.3 --- RESULTS --- p.41
Chapter 4.4 --- DISCUSSION --- p.43
REFERENCES --- p.54
Chapter CHAPTER 5: --- CONCLUSION --- p.55
Wang, Ting. "Investigations on structure and properties of ge-as-se chalcogenide glasses." Phd thesis, 2015. http://hdl.handle.net/1885/116207.
Повний текст джерелаShaw, Tyler A. "Rheological measurements of bulk metallic glass forming alloys above the liquidus temperature." Thesis, 2004. http://hdl.handle.net/1957/28881.
Повний текст джерелаGraduation date: 2005
"Liquid phase separation and glass formation of Pd-Si alloy." 1997. http://library.cuhk.edu.hk/record=b5889335.
Повний текст джерелаThesis (M.Phil.)--Chinese University of Hong Kong, 1997.
Includes bibliographical references (leaves 50-51).
Acknowledgments
Abstract
Chapter Chapter 1 --- Introduction
Chapter 1.1 --- Metallic Glass and its application --- p.1
Chapter 1.2 --- Glass Forming Ability (GFA) --- p.2
Chapter 1.3 --- Equilibrium Phase --- p.3
Chapter 1.4 --- Nucleation and Growth --- p.6
Chapter 1.5 --- Spinodal Decomposition --- p.8
Chapter 1.6 --- Morphology Comparison between Nucleation and Growth and Spinodal --- p.13
Figures --- p.14
References --- p.24
Chapter Chapter 2 --- Experimental Method
Experimental Method --- p.25
Figure --- p.29
References --- p.30
Chapter Chapter 3 --- Metastable liquid miscibility gap in Pd-Si and its glass forming ability
Introduction --- p.32
Experimental --- p.33
Results --- p.34
Discussion --- p.36
Figures --- p.40
References --- p.49
Bibliography --- p.50
Chang, Yuming, and 張育銘. "Thermal And Mechanical Properties Of Microalloyed Cu-Ti-Zr-Ni Bulk Metallic Glasses." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/89179699251114096866.
Повний текст джерела義守大學
材料科學與工程學系
100
Since the development of the amorphous alloys, most alloys have been formed by the employment of such expensive elements as Au, Pt and Zr. In order to lower the cost and elevate their practicality, experts and scholars, therefore, have started to develop the lower-cost Cu-base amorphous alloy, which has excellent mechanical properties and whose compressive fracture strength can reach above 2000MPa. According to previous documents, the thermal and mechanical properties of the amorphous alloy can be elevated by adding a micro amount of the elements of Si, Pd and Fe. This study utilizes the Cu47Ti34Zr11Ni8 alloy, which has the better glass formation ability, as its base. The result indicates that the thermal properties of the alloy’s base can be elevated by adding the elements Si and Pd. The supercooled liquid region of the Cu47Ti34Zr11Ni4Pd4 alloy is approximately 49K, and the glass formation ability of the Cu47Ti34Zr11Ni4Si4 alloy can elevate the values of Trg and γ to 0.61 and 0.4 respectively. The Cu47Ti34Zr11Ni4Si4 alloy contains the precipitated phase of high hardness, thus causing hardness to rise to approximately 725Hv. The Cu47Ti34Zr11Ni6Fe2 alloy produces the precipitated phase that has the capability of absorbing stress and preventing the crack from advancing, enabling the alloy to possess the maximum fracture toughness about 82MPa m1/2. The fracture strength of the Cu47Ti34Zr11Ni4Si4 alloy is 1900MPa. The low amount and the irregular shape of the precipitated phase cause the stress concentration effect inside the alloy and no plastic strain. The fracture strength of the Cu47Ti34Zr11Ni6Fe2 alloy is 2010MPa. Its precipitated phase disperses unevenly and there is no elevated effect on plastic strain. The fracture strength of the Cu47Ti34Zr11Ni4Pd4 alloy is 1977MPa. Its plastic strain is elevated to about 0.7%, caused by the nano crystalline phase precipitated from the inside of the material.
"Amorphous phase separation in a bulk metallic glass of negative heat of mixing." 2012. http://library.cuhk.edu.hk/record=b5549408.
Повний текст джерела為了解決這個難題,示差掃描量熱儀、高分辨電子顯微鏡、掃描透射模式下的高角環射暗場相、以及能量色散X射線光譜儀等檢測儀器在我們實驗當中被使用。同時為了清楚展示非晶相分離反應,在過冷Pd₄₁.₂₅Ni₄₁.₂₅P₁₇.₅熔體被冷卻為固態非晶樣品之前引入了中間熱退火處理。
實驗研究了三種經由不同路徑製備的A、B、C型號樣品。結果表明在非晶/液態Pd₄₁.₂₅Ni₄₁.₂₅P₁₇.₅合金中可能存在獨特的短程有序結構,它會導致相分離的發生。同时研究發現,在大約625 K,調幅分解的持續時間的下限大概是200 s。調幅分解的時間常數R在大約625 K 下為0.002 s⁻¹。三种类型样品在不同的溫度下被退火從而獲得部分的結晶。A型號和B型號具有相似的行為。在低溫下,圓形的核心首先形成,接著發生共晶反應。在高溫下,出現了一種形狀為立方體的析出相。在C型號的樣品當中,核心和立方的析出物同時被發現。但是核心的成分分佈與A和B型號中出現的不同。同時,隨著退火時間的加長形核的數量也具有獨特的行為表現。作為對比,Pd₄₀Ni₄₀P₂₀塊狀金屬玻璃的結晶行為也被展開了研究。同樣的,以形成核心開始,但是它的成分分佈異於A和B型號的樣品。
Amorphous phase separation in metallic glass (including bulk metallic glass) has been a controversial issue in the past several decades. There are reports saying that amorphous phase separation occurs in Pd-Ni-P, which has a negative heat of mixing among its constituent elements. However, there are also as many reports claiming that phase separation is absent in amorphous Pd-Ni-P alloys. The lack of direct experimental evidence makes the issue to be difficult to be resolved.
To solve this problem, differential scanning calorimetry (DSC), high resolution transmission electron microscopy (HRTEM), high angle annular dark field (HAADF) in scanning transmission electron microscopy, and energy dispersive X-ray spectroscopy (EDX) have been employed. Intermediate thermal annealing is introduced before an undercooled Pd₄₁.₂₅Ni₄₁.₂₅P₁₇.₅ melt is cooled down to become a solid amorphous specimen.
A-type, B-type, and C-type specimens of composition, Pd₄₁.₂₅Ni₄₁.₂₅ P₁₇.₅, have been prepared via three different cooling paths. It was found that amorphous phase separation indeed occurs in C-type specimens. Results suggest that there may be unique short range orders in amorphous/liquid Pd₄₁.₂₅Ni₄₁.₂₅P₁₇.₅, which are responsible for the phase separation. Experimental arrangements were made to study the occurrence of spinodal reaction in undercooled molten Pd₄₁.₇₅Ni₄₁.₇₅P₁₇.₅ alloys as a function of time. The lower bound of the duration of the spinodal decomposition at a temperature of {U+2248}625 K is about 200 s and the time constant R of the spinodal decomposition at a temperature of {U+2248}625 K is 0.002 s⁻¹.
A-type and B-type specimens have similar crystallization behavior. At low temperature, it starts with the formation of a spherical core and then eutectic crystallization takes over. At higher temperatures, an additional phase in the shape of a cube appears. In annealed C-type specimens, cores and cubic precipitates are also found. However, the composition profile of the cores is different and the number of nucleation events versus time has peculiar characteristics. The crystallization behavior of Pd₄₀Ni₄₀P₂₀ BMG was studied for comparison. It again starts out with the formation of a core, but with a composition profile different from those of A-type and B-type specimens.
Detailed summary in vernacular field only.
Detailed summary in vernacular field only.
Detailed summary in vernacular field only.
Lan, Si = 對於具有負混合熱的塊狀金屬玻璃非晶相分離的研究 / 蘭司.
Thesis (Ph.D.)--Chinese University of Hong Kong, 2012.
Includes bibliographical references.
Abstract also in Chinese.
Lan, Si = Dui yu ju you fu hun he re de kuai zhuang jin shu bo li fei jing xiang fen li de yan jiu / Lan Si.
Abstract of thesis --- p.i
Acknowledgements --- p.v
List of Tables --- p.x
List of Figures --- p.xi
Chapter Chapter 1 --- Introduction and literature review --- p.1
Chapter 1.1 --- Introduction to metallic glasses --- p.1
Chapter 1.1.1 --- Background of metallic glasses --- p.1
Chapter 1.1.2 --- Glass transition --- p.2
Chapter 1.1.3 --- The undercooling of liquids --- p.3
Chapter 1.1.4 --- Crystal nucleation and growth in liquids --- p.3
Chapter 1.1.4.1 --- Crystal Nucleation in liquids --- p.3
Chapter 1.1.4.2 --- Crystal growth in liquids --- p.5
Chapter 1.1.4.3 --- TTT diagram --- p.6
Chapter 1.1.4.4 --- Crystallization in metallic glasses --- p.6
Chapter 1.1.5 --- Glass formation methods and systems --- p.6
Chapter 1.1.6 --- Glass forming ability and criteria --- p.8
Chapter 1.1.7 --- Properties and applications --- p.9
Chapter 1.2 --- The basic theory of phase separation in a binary system --- p.10
Chapter 1.2.1 --- Thermodynamic background --- p.10
Chapter 1.2.2 --- Solid state phase separation --- p.11
Chapter 1.2.2.1 --- A miscibility gap of binary mixture --- p.11
Chapter 1.2.2.2 --- Nucleation and growth mechanism --- p.12
Chapter 1.2.2.3 --- Spinodal decomposition mechanism --- p.13
Chapter 1.2.3 --- Liquid state miscibility gap in a binary system --- p.21
Chapter 1.3 --- Literature review for phase separation in metallic glasses --- p.23
Chapter 1.4 --- The aim of this thesis --- p.28
Figures --- p.30
References --- p.39
Chapter Chapter 2 --- Experiments and characterization --- p.44
Chapter 2.1 --- Introduction and the outline of the experiments --- p.44
Chapter 2.2 --- Sample preparation --- p.45
Chapter 2.2.1 --- Bulk metallic glasses preparation --- p.45
Chapter 2.2.1.1 --- Preparation of clean fused silica tubes --- p.45
Chapter 2.2.1.2 --- Weighing --- p.46
Chapter 2.2.1.3 --- Alloying --- p.46
Chapter 2.2.1.4 --- Fluxing --- p.47
Chapter 2.2.2 --- Thermal annealing --- p.49
Chapter 2.2.3 --- Specimens preparation for characterization --- p.50
Chapter 2.2.3.1 --- Cutting, molding, grinding and polishing --- p.50
Chapter 2.2.3.2 --- Etching --- p.51
Chapter 2.2.3.3 --- Thinning for TEM foils --- p.51
Chapter 2.3 --- Characterization --- p.55
Chapter 2.3.1 --- Differential scanning calorimetry (DSC) --- p.55
Chapter 2.3.2 --- Scanning electron microscopy (SEM) --- p.55
Chapter 2.3.3 --- Transmission electron microscopy (CTEM and HRTEM) --- p.57
Chapter 2.3.4 --- High angle annular dark field (HAADF) in Scanning transmission electron microscopy (STEM) --- p.58
Chapter 2.3.5 --- Energy dispersive X-ray spectroscopy (EDX) --- p.59
Figures --- p.62
References --- p.69
Chapter 3 --- p.70
Chapter 3.1 --- Introduction --- p.70
Chapter 3.2 --- Materials and Experimental --- p.73
Chapter 3.3 --- Results --- p.75
Chapter 3.3.1 --- Thermal behaviors of three types of specimens --- p.75
Chapter 3.3.2 --- Microstructures of three types of specimens --- p.75
Chapter 3.3.2.1 --- A-type specimens --- p.75
Chapter 3.3.2.2 --- B-type specimens --- p.76
Chapter 3.3.2.3 --- C-type specimens --- p.76
Chapter 3.4 --- Discussion --- p.78
Chapter 3.5 --- Conclusions --- p.79
Chapter 3.6 --- Afterward --- p.79
Figures --- p.80
References --- p.89
Chapter Chapter 4 --- The time constant of the spinodal decomposition in Pd₄₁.₇₅Ni₄₁.₇₅P₁₇.₅ bulk metallic glasses --- p.92
Chapter 4.1 --- Introduction --- p.92
Chapter 4.2 --- Materials and experimental --- p.92
Chapter 4.3 --- Results --- p.94
Chapter 4.3.1 --- Thermal behaviors --- p.94
Chapter 4.3.2 --- Microstructures --- p.94
Chapter 4.4 --- Discussion --- p.96
Chapter 4.5 --- Conclusions --- p.98
Figures --- p.100
References --- p.123
Chapter Chapter 5 --- Crystallization in homogeneous and phase-separated Pd₄₁.₂₅Ni₄₁.₂₅P₁₇.₅ bulk metallic glasses --- p.125
Chapter 5.1 --- Introduction --- p.125
Chapter 5.2 --- Experiments --- p.126
Chapter 5.3 --- Results --- p.128
Chapter 5.3.1 --- Low temperature thermal annealing at 613 K with 0≤t{U+2090} ≤ 8 h --- p.128
Chapter 5.3.1.1 --- A-type and B-type specimens --- p.128
Chapter 5.3.1.2 --- C-type specimens --- p.130
Chapter 5.3.1.3 --- Pd₄₀Ni₄₀P₂₀ BMG --- p.132
Chapter 5.3.2 --- High temperature thermal annealing --- p.133
Chapter 5.3.2.1 --- A-type and B-type specimens --- p.133
Chapter 5.3.2.2 --- C-type specimens --- p.135
Chapter 5.3.2.3 --- Pd₄₀Ni₄₀P₂₀ BMG --- p.137
Chapter 5.4 --- Discussion --- p.137
Chapter 5.4.1 --- Formation of spherical cores --- p.138
Chapter 5.4.1.1 --- A-type and B-type Pd₄₁.₇₅Ni₄₁.₇₅P₁₇.₅ specimens --- p.138
Chapter 5.4.1.2 --- C-type Pd₄₁.₇₅Ni₄₁.₇₅P₁₇.₅ specimens --- p.139
Chapter 5.4.1.3 --- Pd₄₀Ni₄₀P₂₀ BMG --- p.140
Chapter 5.4.2 --- Formation of cubic precipitates --- p.141
Tables --- p.142
Figures --- p.144
References --- p.188
Chapter Chapter 6 --- Conclusions --- p.190
Bibliography --- p.192
Prashanth, S. B. Bhanu. "Development Of Instrumentation For Electrical Switching Studies And Investigations On Switching And Thermal Behavior Of Certain Glassy Chalcogenides." Thesis, 2008. http://hdl.handle.net/2005/735.
Повний текст джерела"Evidence of amorphous/liquid phase separation in Pd₄₁.₂₅Ni₄₁.₂₅P₁₇.₅ alloy." 2011. http://library.cuhk.edu.hk/record=b5894648.
Повний текст джерелаThesis (M.Phil.)--Chinese University of Hong Kong, 2011.
Includes bibliographical references.
Abstracts in English and Chinese.
Yin, Weixin = Fei jing ye tai ba-nie-lin he jin xiang wei fen li de zheng ju / Yin Weixin.
Acknowledgement --- p.i
Abstract --- p.ii
Contents --- p.iv
Chapter Chapter 1 --- Introduction --- p.1
Chapter 1.1 --- A Brief Introduction to Metallic Glass --- p.1
Chapter 1.2 --- Homogeneous Nucleation Frequency --- p.3
Chapter 1.3 --- Heterogeneous Nucleation Frequency --- p.4
Chapter 1.4 --- Spinodal Decomposition --- p.5
Chapter 1.5 --- Conditions for Metallic Glasses Formation --- p.8
Chapter 1.6 --- How to Get Large Undercooling --- p.9
Chapter 1.7 --- Liquid Phase Separation --- p.10
References --- p.12
Figures --- p.13
Chapter Chapter 2 --- Experimental Procedures and Techniques of Transmission Electron Microscopy --- p.18
Chapter 2.1 --- Sample preparation --- p.18
Chapter 2.1.1 --- Ni2P Preparation --- p.18
Chapter 2.1.2 --- Alloying --- p.18
Chapter 2.1.3 --- Fluxing --- p.18
Chapter 2.2 --- Introduction to TEM Specimen Preparation --- p.19
Chapter 2.2.1 --- "Grinding, Polishing and Punching" --- p.19
Chapter 2.2.2 --- Final Thinning by Ion Miller --- p.20
Chapter 2.2.3 --- Final Thinning by Twin Jet --- p.20
Chapter 2.3 --- Introduction to Transmission Electron Microscopy Techniques --- p.21
Chapter 2.3.1 --- Basic Instrumentations of TEM --- p.21
Chapter 2.3.2 --- Elastic Scattering and Inelastic Scattering --- p.21
Chapter 2.3.3 --- Image Contrast --- p.22
Chapter 2.3.4 --- Dark Field Image and Bright Field Image --- p.24
Chapter 2.3.5 --- EDX Mapping --- p.24
Chapter 2.3.6 --- High Resolution Images --- p.25
References --- p.26
Figures --- p.27
Chapter Chapter 3 --- Evidence of amorphous/liquid phase separation in Pd41.25Ni41.25P17.5 alloy --- p.32
Chapter 3.1 --- Introduction --- p.32
Chapter 3.2 --- Experimental --- p.34
Chapter 3.3 --- Discussions --- p.42
References --- p.44
Figures --- p.45
Chapter Chapter 4 --- Conclusions --- p.68
"Liquid phase separation in molten Pd-Ni-P alloy =: 熔融鈀-鎳-磷合金的液態相分離". Chinese University of Hong Kong, 1996. http://library.cuhk.edu.hk/record=b5888966.
Повний текст джерелаThesis (M.Phil.)--Chinese University of Hong Kong, 1996.
Includes bibliographical references (leaves [138]-[142]).
by Yuen Cheong Wing.
Acknowledgments --- p.ii
Abstract --- p.iii
Table of Contents --- p.v
Chapter Chapter 1: --- Introduction --- p.1-1
Chapter 1.1 --- What is Metallic Glass? --- p.1-1
Chapter 1.2 --- Use of Metallic Glass --- p.1-3
Chapter 1.3 --- A Dilemma --- p.1-4
Chapter 1.4 --- Glass Forming Ability --- p.1-5
Chapter 1.5 --- Role of Liquid State Phase Separation in GFA --- p.1-6
References --- p.1-9
Figure --- p.1-10
Chapter Chapter 2: --- Phase Separation Theory --- p.2-1
Chapter 2.1 --- Free Energy Curve --- p.2-1
Chapter 2.2 --- Nucleation and Growth --- p.2-2
Chapter 2.2.1 --- Liquid state nucleation and growth --- p.2-2
Chapter 2.2.2 --- Nucleation and growth during solidification --- p.2-4
Chapter 2.3 --- Spinodal Decomposition --- p.2-5
Chapter 2.3.1 --- Cahn-Hilliard linearized equation --- p.2-6
Chapter 2.3.2 --- Temporal evolution --- p.2-9
References --- p.2-12
Figures --- p.2-15
Chapter Chapter 3 : --- Experimental Setup and Techniques --- p.3-1
Chapter 3.1 --- Technique in Achieving High Undercooling --- p.3 -1
Chapter 3.1.1 --- Effects and limitation of B203 --- p.3-1
Chapter 3.1.2 --- Preparation of B203 --- p.3-3
Chapter 3.1.3 --- Cleansing of apparatus --- p.3-4
Chapter 3.2 --- Experimental --- p.3-5
Chapter 3.2.1 --- Sample preparation --- p.3-6
Chapter 3.2.2 --- Experimental setup --- p.3-7
Chapter 3.2.3 --- Procedures --- p.3-8
Chapter 3.3 --- Observing the Microstructure --- p.3-9
Chapter 3.3.1 --- Cutting --- p.3-10
Chapter 3.3.2 --- Molding --- p.3-10
Chapter 3.3.3 --- Polishing --- p.3-11
Chapter 3.3.4 --- Etching --- p.3-12
Chapter 3.3.5 --- Observation --- p.3-12
References --- p.3-14
Table --- p.3-15
Figures --- p.3-16
Chapter Chapter 4: --- Metastable liquid phase separationin undercooled molten PD40. 5]\l40.5P19 --- p.4-1
Abstract --- p.4-1
References --- p.4-9
Figures --- p.4-10
Chapter Chapter 5 : --- Transformation in undercooled molten PD40.5NI40.5P19 --- p.5-1
Chapter 5.1 --- Abstract --- p.5-1
Chapter 5.1 --- Introduction --- p.5-2
Chapter 5.3 --- Experimental --- p.5-4
Chapter 5.4 --- Results --- p.5-6
Chapter 5.5 --- Discussions --- p.5-13
References --- p.5-20
Figures --- p.5-22
Chapter Chapter 6 : --- Solidification of liquid spinodal in undercooled PD40.5NI40.5P19 --- p.6-1
Chapter 6.1 --- Abstract --- p.6-1
Chapter 6.2 --- Introduction --- p.6-2
Chapter 6.3 --- Experimental --- p.6-3
Chapter 6.4 --- Results --- p.6-5
Chapter 6.5 --- Discussions --- p.6-10
References --- p.6-17
Figures --- p.6-18
Chapter Chapter 7: --- Conclusion --- p.7-1
References --- p.7-4
Bibliography --- p.B-1
"Thermal conductivity of metallic glasses by pulsed photothermal radiometry =: [Mo chong guang re fu she fa ce ding jin shu bo li zhi re dao xing]." Chinese University of Hong Kong, 1990. http://library.cuhk.edu.hk/record=b5886925.
Повний текст джерелаParallel title in Chinese characters.
Thesis (M.Phil.)--Chinese University of Hong Kong, 1990.
Bibliography: leaves 71-74.
Acknowledgement
Abstract
Chapter 1. --- Introduction
Chapter 1.1 --- General Introduction --- p.1
Chapter 1.2 --- Properties --- p.5
Chapter 1.3 --- Background of this research --- p.10
Chapter 1.4 --- The Present Experiment --- p.11
Chapter 2. --- Theory
Chapter 2.1 --- Conduction Mechanism --- p.15
Chapter 2.2 --- Temperature Dependence of Thermal Conductivity --- p.16
Chapter 2.3 --- Phonon Conductivity and phonon mean free path --- p.20
Chapter 3. --- Experimental
Chapter 3.1 --- Thermal Diffusivity by Laser Photothermal Radiometry --- p.22
Chapter 3.2 --- Resistivity Measurement --- p.30
Chapter 3.3 --- Sample Preparation --- p.36
Chapter 3.4 --- Data Analysis --- p.37
Chapter 4. --- Results and Discussion
Chapter 4.1 --- Thermal Conductivity --- p.41
Chapter 4.2 --- Electronic Thermal Conductivity --- p.47
Chapter 4.3 --- Phonon Thermal Conductivity --- p.52
Chapter 4.4 --- Phonon Mean Free Path --- p.58
Chapter 5. --- Conclusion and Suggestions for Further Work --- p.68
References --- p.71
Appendixes --- p.75
Lai, Siao-Jie, and 賴孝杰. "High Annealing Point Glass Layers on Alumina Substrate and the Thermal Properties of the Glasses." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/22266370999536156743.
Повний текст джерела大同大學
材料工程學系(所)
97
The speed of the energy consumption is much fast than before in recent year and the green energy becomes the popular issue at present. And because of improving the efficiency and decreasing the cost, the research, absorbing the solar energy to change into the solar cell, is in progress. Now the silicon solar cell is the main trend on the market. In the process of producing polycrystall silicon thin film, the development of non-silicon substrate (foreign substrate) becomes much important for producing the solar cell of the wide area and declines the dependence of the silicon. For getting the polycrystall silicon thin film of the high-quality to adjust the difference between the thermal expansion coefficients, the surface of the substrate is covered with the interlayer. And for improving the smooth level of the alumina substrate, it is applied to deposit the solar cell of the polycrystall silicon thin film. The research shows that the glasses of m=20,15 ,and A2S2L6 have appropriate thermal expansion coefficient (it’s between alumina substrate (CTE:8.0X10-6/oC) and silicon deposition layer(2.9~3.6X10-6/oC, 20~1200oC)), higher anneal temperature(>800oC), lower stall temperature(<1500oC),and the smooth level of the great smooth layer(Rms<0.5nm), guessing that may be made the interlayer of the glass between the alumina substrate and the silicon deposition layer.
"Preparation and characterization of bulk amorphous and nanostructured iron-40 nickel-40 phosphorus-14 boron-6 alloys." 2002. http://library.cuhk.edu.hk/record=b6073403.
Повний текст джерелаThe numerals in title is subscript.
Thesis (Ph.D.)--Chinese University of Hong Kong, 2002.
Includes bibliographical references.
Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web.
Mode of access: World Wide Web.
Abstracts in English and Chinese.
Anbarasu, M. "Electrical Switching And Thermal Studies On Certain Ternary Telluride Glasses With Silicon Additive And Investigations On Their Suitability For Phase Change Memory Applications." Thesis, 2007. http://hdl.handle.net/2005/617.
Повний текст джерела"Optical and thermal properties of samarium-doped fluorophosphate and fluoroaluminate glasses for high-dose, high-resolution dosimetry applications." Thesis, 2014. http://hdl.handle.net/10388/ETD-2014-10-1780.
Повний текст джерелаGanesan, R. "Thermal And Optical Properties Of Ge-Se Glass Matrix Doped With Te, Bi And Pb." Thesis, 2004. http://hdl.handle.net/2005/337.
Повний текст джерелаChung, Tsan-Man, and 鍾璨蔓. "Effect of Ag addition on the enhancement of thermal and mechanical properties of Cu-Zr-Al bulk metallic glasses." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/20889028337379240950.
Повний текст джерела義守大學
材料科學與工程學系
102
Since the development of amorphous alloys, most scholars using Au, Pd and other more expensive metal elements as the substrate. In order to reduce costs and improve usability, scholars began to develop the Cu-based amorphous alloys, with lower cost and good mechanical properties, especially for Cu-Zr-based amorphous alloy with a deep eutectic point in Cu50Zr50 alloy system, it can easily formed an amorphous alloy in the low temperature. Therefore, Cu50Zr43Al7 alloy with high glass forming ability were be used at the base alloy in this experiment. Replace Cu elements by Ag element. Pure Ag element are selected to partially substitute Cu element to form Cu50-xZr43Al7Agx (x=0, 3, 4, 5, 6) bulk metallic glasses (BMGs) in this research. According to the literature, the adding of Ag elements can effectively enhance the thermal properties and the mechanical properties of amorphous alloys. The BMG specimens were be prepared by the use of arc-melting and injection casting process. The effect of Ag addition on the vitrification, thermal and mechanical properties of Cu-Zr-Al-Ag amorphous alloys were studied here. BMG specimens were examined by X-ray diffractometer (XRD), differential scanning calorimeter (DSC), Vickers hardness tester, material test system (MTS), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The results revealed that the Cu50-xZr43Al7Agx alloy systems were formed in amorphous state in this study. The glass transition temperature (Tg) and the liquidus temperature (Tl) of Cu-Zr-Al alloy decreased with adding of Ag. Hence the supercooled liquid region (Tx) and (=Tx/(Tg+Tl)) Cu45Zr43Al7Ag5 alloy increased to 76K and 0.425, respectively. It means that the enhancement of the thermal stability and glass forming ability of Cu-Zr-Al-Ag BMG alloys with adding of Ag. The result of room temperature compressive fracture strength and strain measured from Cu47Zr43Al7Ag3 was of about 2191 MPa and 2.0%. Dense dispersion of vein pattern on the fracture surface of Cu47Zr43Al7Ag3 BMG specimen via compressive test was be observed, indicating a typical ductile fracture behavior and the improved of plasticity of alloys with minor addition of Ag. In the Cu47Zr43Al7Ag3 alloy, there were 4~10 nm nanocrystalline phase uniformly distributed in the substrate. This is the reason that the strength and plastic strain of the alloy to be enhanced here.
Das, Chandasree. "Investigations On Certain Tellurium Based Bulk Chalcogenide Glasses And Amorphous Chalcogenide Films Having Phase Change Memory (PCM) Applications." Thesis, 2011. http://etd.iisc.ernet.in/handle/2005/2378.
Повний текст джерелаThomas, P. "Investigations Into The Structural And Dielectric Properties Of Nanocrystallites Of CaCu3Ti4O12 And The Composites Based On Polymers And Glasses." Thesis, 2011. http://etd.iisc.ernet.in/handle/2005/2234.
Повний текст джерелаChen, Huang-Lu, and 陳黃祿. "Microstructural and Optical Properties of UV/DUV Fluoride Thin Films Fabricated by Thermal Evaporation with Ion Assisted Deposition Using SF6 as Working Gas." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/60730128979008328021.
Повний текст джерела輔仁大學
應用科學與工程研究所博士班
98
Fluorides are present used to accomplish optical coatings for UV and deep UV range applications. Many techniques such as thermal evaporation, ion beam sputtering, electron-beam evaporation, magnetron sputtering, and ion-assisted deposition (IAD) are applied to improve the quality of fluoride films. Nevertheless, improvements of their optical and microstructural qualities are still needed. In this study, fluoride films as magnesium fluoride (MgF2), gadolinium fluoride (GdF3) and aluminum fluoride (AlF3) were fabricated at room temperature by using a thermal evaporation method with an ion-assisted deposition technique. Using sulfur hexafluoride (SF6) as a working gas in the IAD process so that more F- ions can be created from the dissociation of SF6 gas to improve the stoichiometry of fluoride films. Furthermore, optical and microstructural properties of the films deposited by using different working gases such as argon (Ar), oxygen mixed sulfur hexafluoride (O2+SF6) and without using gas in the IAD process or using SF6 as an ambient gas to where investigated. In this study, the optimal ion-assisted voltage and current in the IAD process were determined first. The optical properties of the films were analyzed by UV/Visible/NIR spectrophotometer, micro-spot spectroscopic ellipsometer and Fourier transform infrared spectrometer (FTIR). The microstructural properties of the films were examined by atomic force microscope (AFM), field emission scanning electron microscope (FE-SEM) and X-ray diffractometer (XRD). Moreover, X-ray photoelectron spectroscopy (XPS) was used to investigate the composition, atomic concentrations and stoichiometry of fluoride films. The binding energy (BE) shifts of Mg 2p, Gd 4d, Al 2p, O 1s and F 1s were analyzed after spectra were decomposed by some sub-peaks using a peak fitting software. The contaminants in the fluoride films such as Ar and S atoms were also identified by XPS. The correlations among the film composition, optical properties and physical properties were also discussed. In conclusion, it was found that SF6 used as a working gas in the thermal evaporation process with an IAD technique, three fluoride films, MgF2, GdF3 and AlF3, all showed better optical qualities, packing densities and stoichiometric structures.
Naik, Ramakanta. "Photo And Thermal Induced Studies On Sb/As2S3 Multilayered And (As2S3)1-xSbx Thin Films." Thesis, 2009. http://hdl.handle.net/2005/2017.
Повний текст джерела