Bibliografie tematiche / Manganese silicate

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Letteratura scientifica selezionata sul tema "Manganese silicate"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 1 febbraio 2022

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Articoli di riviste sul tema "Manganese silicate"

Liu, Yue, Zhong Lin Chen, Yu Liu, Ying Han, He Wang e Ji Min Shen. "Manganese Silicate Catalyzed Ozonation of m-Chloronitrobenzene in Drinking Water". Advanced Materials Research 239-242 (maggio 2011): 1159–64. http://dx.doi.org/10.4028/www.scientific.net/amr.239-242.1159.

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Manganese silicate, a stable and efficient catalyst prepared in the laboratory has been successfully used as a catalyst combined with ozonation in the degradation of m-Chloronitrobenzene (mCNB). The catalytic ozonation removal effectiveness of mCNB was investigated under various physicochemical conditions. Both the adsorption and the single ozonation were not effective for the degradation of mCNB, but the presence of manganese silicate in ozonation process could substantially enhance the mCNB removal efficiency. The hydroxyl radical scavenger experiment confirmed that manganese silicate catalytic ozonation followed a radical - type mechanism. The increasing of the manganese silicate dosage could enhance the removal effectiveness of mCNB. The manganese silicate catalyst could be recycled easily without decreasing any ozone catalytic activity after four successive reuses. It is concluded that the manganese silicate was an efficient green catalyst for mCNB degradation in drinking water.

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Bosecker, Klaus. "Bioleaching of silicate manganese ores". Geomicrobiology Journal 11, n. 3-4 (luglio 1993): 195–203. http://dx.doi.org/10.1080/01490459309377951.

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Zhu, Shuairu, Jiabo Le, Jianming Li, Deyu Liu e Yongbo Kuang. "Tungsten doped manganese silicate films as stable and efficient oxygen evolution catalysts in near-neutral media". Journal of Materials Chemistry A 9, n. 33 (2021): 17893–904. http://dx.doi.org/10.1039/d1ta01524a.

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We designed novel manganese silicate-based film materials on FTO which can act as potential oxygen evolution reaction (OER) catalysts in near-neutral media. W doping not only induces better apparent activity, but also results in much improved stability of manganese silicate.

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Simachev, A. S., T. N. Oskolkova, A. A. Umanskii e A. V. Golovatenko. "Non-metallic inclusions in different zones of crystallization of E90KhAF rail steel". Izvestiya. Ferrous Metallurgy 64, n. 2 (2 aprile 2021): 135–42. http://dx.doi.org/10.17073/0368-0797-2021-2-135-142.

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Metallographic and X-ray studies of continuously cast billets of E90KhAF rail steel have been carried out. We have established the regularities of non-metallic inclusions distribution over the crystallization zones before and after billets deformation. It was revealed that in crustal zone the main non-metallic inclusions are point oxides, aluminum nitrides, iron silicates (FeO·SiO2) and alumosilicates (Al2O3·SiO2). They were identified in the zone of columnar crystals. In central zone of the billet, manganese sulfides (MnS), manganese silicates (MnO·SiO2), alumosilicates (Al2O3·SiO2), iron silicates (FeO·SiO2), and point oxides were found. It has been determined that concentration and size of nonmetallic inclusions tend to increase from the surface to central zone of continuously cast billets, which is consistent with generally accepted ideas about mechanisms of billet formation during crystallization. The mechanism of deformation of two-phase silicate non-metallic inclusions and their influence on quality of rail products was disclosed. It is shown that inhomogeneous deformability of complex silicate inclusions aggravates their harmful effect on rail products quality. In this case, additional stresses appear in addition to inclusion-matrix deformation and contact stresses existing at interphase boundaries. This pattern also holds for non-deformed silicate inclusions. Such a distribution of inclusions in the billets volume somewhat reduces their negative effect on rails quality, since near-contact layers of the billet undergo more intense deformation during rolling, and as the axial zone of a billet is approached, deformation rate decreases.

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Gummow, Rosalind J., e Yinghe He. "Mesoporous manganese-deficient lithium manganese silicate cathodes for lithium-ion batteries". RSC Adv. 4, n. 23 (2014): 11580–84. http://dx.doi.org/10.1039/c3ra47730d.

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A manganese-deficient lithium manganese silicate cathode is synthesised by an emulsion synthesis route, using mesoporous silica as a template, to give a mesoporous product with excellent electrochemical reversibility in lithium cells.

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Wu, Wei, Peng Wang, Lu Lin e Shi-fan Dai. "Manganese Ore Decomposition and Carbon Reduction in Steelmaking". High Temperature Materials and Processes 37, n. 8 (28 agosto 2018): 741–47. http://dx.doi.org/10.1515/htmp-2017-0042.

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AbstractTo improve the direct alloying of manganese ore in steelmaking, the decomposition and carbon reduction of manganese ore was studied using a differential thermal analyzer and resistance furnace. The remaining material after manganese ore decomposition at 1,600 °C was a mixture of 43 % MnO, 40 % MnSiO3 and FeO, and 17 % MnSiO3. The remaining material after the carbon reduction of the manganese ore was a mixture of metal (30.8 % Mn7C3 and 16.1 % FeC3) and slag (2.5 % FeO, 5.1 % SiO2, and 18.8 % MnO). The high-temperature (1,200 ℃) decomposition and reduction of manganese ore produce manganese carbonate, manganese dioxide, and manganese salicylate sesquioxide. However, because it is not easy to decompose the manganese silicate in the manganese ore, the proportion of ore being reduced by carbon is small. Therefore, the increase of the manganese reduction of manganese silicate is critical to the direct alloying of manganese ore. Adding calcium oxide or magnesium oxide to the manganese ore improves the reduction of manganese ore, whereas adding slag from the initial stage or endpoint of the converter process has little effect on the manganese ore reduction.

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Krüger, Hannes, Peter Tropper, Udo Haefeker, Reinhard Kaindl, Martina Tribus, Volker Kahlenberg, Christoph Wikete, Martin R. Fuchs e Vincent Olieric. "Innsbruckite, Mn33(Si2O5)14(OH)38 – a new mineral from the Tyrol, Austria". Mineralogical Magazine 78, n. 7 (dicembre 2014): 1613–27. http://dx.doi.org/10.1180/minmag.2014.078.7.06.

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AbstractA description of the new mineral innsbruckite, Mn33(Si2O5)14(OH)38, a hydrous manganese phyllosilicate found in Tyrol, Austria is given. The crystal structure was determined by singlecrystal synchrotron radiation diffraction experiments at the X06DA beamline at the Swiss Light Source (Paul Scherrer Institute, Villigen, Switzerland). The space group is Cm and lattice parameters are a = 17.2760(19), b = 35.957(5), c = 7.2560(8) Å , β = 91.359(7)º, V = 4506.1(10) Å3, Z = 2. Innsbruckite belongs to the group of modulated 1:1 layer silicates and is chemically and structurally quite closely related to bementite, Mn7(Si2O5)3(OH)8. The chemical analysis revealed a close to ideal composition with only minor amounts of Al, Fe and Mg. Using Liebau’s nomenclature for silicate classification the silicate anion can be described as an unbranched siebener single layer. Innsbruckite shows a complex topology of the silicate sheet, exhibiting 4-, 5-, 6- and 8-membered rings. The silicate sheet is fully characterized using vertex symbols, and its topology is compared to those in other complex sheet silicates. Furthermore, the structural investigation is complemented with Raman spectroscopic studies.

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Tsymbalist, S. I., I. V. Cheprasov, R. A. Konoplev e A. N. Seregin. "Smelting of ferrosilicon manganese from unconventional silicate-oxide manganese raw material". Metallurgist 57, n. 5-6 (settembre 2013): 526–29. http://dx.doi.org/10.1007/s11015-013-9763-4.

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Wu, Zhongcao, Hui Zhuang, Bing Ma, Yin Xiao, Bahattin Koc, Yufang Zhu e Chengtie Wu. "Manganese-Doped Calcium Silicate Nanowire Composite Hydrogels for Melanoma Treatment and Wound Healing". Research 2021 (7 maggio 2021): 1–12. http://dx.doi.org/10.34133/2021/9780943.

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Melanoma is a serious malignant skin tumor. Effectively eliminating melanoma and healing after-surgical wounds are always challenges in clinical studies. To address these problems, we propose manganese-doped calcium silicate nanowire-incorporated alginate hydrogels (named MCSA hydrogels) for in situ photothermal ablation of melanoma followed by the wound healing process. The proposed MCSA hydrogel had controllable gelation properties, reasonable strength, and excellent bioactivity due to the incorporated calcium silicate nanowires as the in situ cross-linking agents and bioactive components. The doping of manganese into calcium silicate nanowires gave them excellent photothermal effects for eradicating melanoma effectively under near infrared (NIR) irradiation. Moreover, the synergistic effect of manganese and silicon in the MCSA hydrogel effectively promotes migration and proliferation of vascular endothelial cells and promotes angiogenesis. Hence, such bifunctional bioactive hydrogels could achieve combined functions of photothermal therapy and wound healing, showing great promise for melanoma therapy and tissue regeneration.

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Wang, Hong-Yan, Yue-Ya Wang, Xue Bai, Huan Yang, Jian-Ping Han, Ning Lun, Yong-Xin Qi e Yu-Jun Bai. "Manganese silicate drapes as a novel electrode material for supercapacitors". RSC Advances 6, n. 107 (2016): 105771–79. http://dx.doi.org/10.1039/c6ra19102a.

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Più fonti

Tesi sul tema "Manganese silicate"

Dixon, Roger. "Sugilite and associated metamorphic silicate minerals from Wessels Mine, Kalahari manganese field". Master's thesis, University of Cape Town, 1988. http://hdl.handle.net/11427/17066.

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Bibliography: pages 143-151.
Sugilite, a purple mineral belonging to the milarite group, occurs in the lower manganese orebody at Wessels Mine, in the Kalahari Manganese Field. This orebody was formed in the lowermost manganiferous horizon of the Hotazel Member of the Voelwater Jasper Formation, part of the volcanogenic sedimentary iron formation of the Griqualand West Sequence. At Wessels Mine, which is located northwest of Kuruman in the northwestern Cape Province, evidence of a widespread and pervasive hydrothermal event which took place around 1300 Ma is found in the form of upgrading of the manganese-ore horizons and the formation of zoned silicate-mineral assemblages. The presence of unusual minerals such as glaucochroite, iron akermanite, xonotlite and hydrogarnets of various types constrains the main phase of metamorphism to between 400 and 450 °C in a low pressure, hydrous environment with XCO2 ≤ 0,02. All the minerals which occur in these assemblages are described and discussed in terms of their chemistry and formation.

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Ndipingwi, Miranda Mengwi. "Graphol and vanadia-linkedzink-doped lithium manganese silicate nanoarchitectonic platforms for supercapatteries". University of Western cape, 2020. http://hdl.handle.net/11394/7236.

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Philosophiae Doctor - PhD
Energy storage technologies are rapidly being developed due to the increased awareness of global warming and growing reliance of society on renewable energy sources. Among various electrochemical energy storage technologies, high power supercapacitors and lithium ion batteries with excellent energy density stand out in terms of their flexibility and scalability. However, supercapacitors are handicapped by low energy density and batteries lag behind in power. Supercapatteries have emerged as hybrid devices which synergize the merits of supercapacitors and batteries with the likelihood of becoming the ultimate power sources for multi-function electronic equipment and electric/hybrid vehicles in the future. But the need for new and advanced electrodes is key to enhancing the performance of supercapatteries. Leading-edge technologies in material design such as nanoarchitectonics become very relevant in this regard. This work involves the preparation of vanadium pentoxide (V2O5), pristine and zinc doped lithium manganese silicate (Li2MnSiO4) nanoarchitectures as well as their composites with hydroxylated graphene (G-ol) and carbon nanotubes (CNT).
2023-12-01

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Ndipingwi, Miranda Mengwi. "Graphol and vanadia-link zin doped lithium manganese silicate nanoarchitectonic platforms for supercapatteries". University of the Western Cape, 2020. http://hdl.handle.net/11394/7611.

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Doctor Educationis
Energy storage technologies are rapidly being developed due to the increased awareness of global warming and growing reliance of society on renewable energy sources. Among various electrochemical energy storage technologies, high power supercapacitors and lithium ion batteries with excellent energy density stand out in terms of their flexibility and scalability. However, supercapacitors are handicapped by low energy density and batteries lag behind in power. Supercapatteries have emerged as hybrid devices which synergize the merits of supercapacitors and batteries with the likelihood of becoming the ultimate power sources for multi-function electronic equipment and electric/hybrid vehicles in the future. But the need for new and advanced electrodes is key to enhancing the performance of supercapatteries. Leading edge technologies in material design such as nanoarchitectonics become very relevant in this regard. This work involves the preparation of vanadium pentoxide (V2O5), pristine and zinc doped lithium manganese silicate (Li2MnSiO4) nanoarchitectures as well as their composites with hydroxylated graphene (G-ol) and carbon nanotubes (CNT).
2023-12-02

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Myalo, Zolani. "Graphenised Lithium Iron Phosphate and Lithium Manganese Silicate Hybrid Cathode Systems for Lithium-Ion Batteries". University of the Western Cape, 2017. http://hdl.handle.net/11394/6036.

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Magister Scientiae - MSc (Chemistry)
This research was based on the development and characterization of graphenised lithium iron phosphate-lithium manganese silicate (LiFePO4-Li2MnSiO4) hybrid cathode materials for use in Li-ion batteries. Although previous studies have mainly focused on the use of a single cathode material, recent works have shown that a combination of two or more cathode materials provides better performances compared to a single cathode material. The LiFePO4- Li2MnSiO4 hybrid cathode material is composed of LiFePO4 and Li2MnSiO4. The Li2MnSiO4 contributes its high working voltage ranging from 4.1 to 4.4 V and a specific capacity of 330 mA h g-1, which is twice that of the LiFePO4 which, in turn, offers its long cycle life, high rate capacity as well as good electrochemical and thermal stability. The two cathode materials complement each other's properties however they suffer from low electronic conductivities which were suppressed by coating the hybrid material with graphene nanosheets. The synthetic route entailed a separate preparation of the individual pristine cathode materials, using a sol-gel protocol. Then, the graphenised LiFePO4-Li2MnSiO4 and LiFePO4-Li2MnSiO4 hybrid cathodes were obtained in two ways: the hand milling (HM) method where the pristine cathodes were separately prepared and then mixed with graphene using a pestle and mortar, and the in situ sol-gel (SG) approach where the Li2MnSiO4 and graphene were added into the LiFePO4 sol, stirred and calcined together.
2021-04-30

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Porcel, Henrique Reatto. "Síntese e caracterização de silicato de zinco dopado com manganês /". Rio Claro, 2019. http://hdl.handle.net/11449/191121.

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Orientador: Alexandre Mesquita
Resumo: Os materiais nanoestruturados vêm sendo extensivamente estudados, não somente pelas novas propriedades e suas possíveis aplicações tecnológicas, mas também pela busca de uma melhor compreensão dos aspectos físicos e químicos. Em relação a materiais semicondutores, estudos da estrutura em escala nanométrica tem recebido considerável interesse em razão do efeito de tamanho que exibem. Semicondutores nanocristalinos apresentam propriedades eletrônicas intermediárias entre aqueles de estrutura molecular e sólidos macrocristalinos e são objeto de intensa pesquisa, apresentando uma grande diversidade de aplicações quando na forma nanoestruturada. Dentre esses materiais, o silicato de zinco (Zn2SiO4) puro ou dopado tem recebido atenção em razão de notáveis propriedades fundamentais, versatilidade e potencial para diversas aplicações tecnológicas. Nesse contexto, essa dissertação teve como objetivo realizar a síntese e a caracterização de Zn2SiO4 puro e dopado com átomos de manganês e sua correlação com propriedades fotoluminescentes. Neste trabalho, foi utilizado o método químico de preparação conhecido por co-preciptação. Deste modo, a caracterização morfológica foi realizada através da técnica de microscopia eletrônica de varredura de alta resolução (FEG-MEV), a qual demonstra um aglomerado de grãos, tornando a determinação do tamanho do mesmo difícil. As propriedades estruturais das nanopartículas, bem como suas propriedades físicas e químicas, foram determinadas através das técn... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: Nanostructured materials have been extensively studied, not only for new properties and their possible technological applications, but also for a better understanding of the physical and chemical aspects. With regard to semiconductor materials, nanoscale structure studies have received considerable interest because of the size effect they exhibit. Nanocrystalline semiconductors have intermediate electronic properties between those of molecular structure and macrocrystalline solids and are the subject of intense research, presenting a great diversity of applications when in nanostructured form. Among these materials, pure or doped zinc silicate (Zn2SiO4) has received attention because of its remarkable fundamental properties, versatility and potential for various technological applications. In this context, this dissertation aimed to synthesize and characterize pure and doped Zn2SiO4 with manganese atoms and its correlation with photoluminescent properties. In this work, the chemical preparation method known as co-precipitation was used. Thus, the morphological characterization was performed by the high resolution scanning electron microscopy (FEG-SEM) technique, which demonstrates a grain cluster, making the size determination difficult. The structural properties of nanoparticles, as well as their physical and chemical properties, were determined by X-ray diffraction, Raman spectroscopy and photoluminescence techniques, with which it is possible to observe the formation of na... (Complete abstract click electronic access below)
Mestre

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Chen, Chih-Yao. "A study on positive electrode materials for sodium secondary batteries utilizing ionic liquids as electrolytes". Kyoto University, 2014. http://hdl.handle.net/2433/192207.

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Turquet, François-Xavier. "Insertion of fluorescent manganese compounds - models of catalase - into mesoporous nanoparticles of silica, resol-silica and carbon-silica". Doctoral thesis, Universitat de Barcelona, 2018. http://hdl.handle.net/10803/666907.

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ROS (Reactive Oxygen Species), such as H2O2, HO● and O2-●, are naturally produced by the metabolism of living beings. However, they can appear in large quantities in the case of certain diseases (Alzheimer's, Parkinson's, sclerosis, cancer). Overproduction of ROS leads to higher cell mortality. Some microorganisms have an Mn-based enzyme capable of catalyzing the disproportionation reaction of H2O2 into O2 and H2O. Several molecules have been synthesized to reproduce this process, however very few of them are active in aqueous environment. Recently, polynuclear synthetic Mn species have been introduced into mesoporous silica to protect them from the environment. Thus, these complexes of Mn are stable and even see their catalytic activity increase. In order to persevere in this way, this thesis presents new compounds of formula [Mn(bpy)(AntCO2)2]n and [{Mn(bpy)(AntCO2)}2(µ-AntCO2)2(µ-OH2)] for MnII (chain and dinuclear respectively) and [Mn4O2(AntCO2)6(bpy)2(ClO4)2] for MnIII (tetranuclear) based on this concept. These compounds have two types of ligands, 2,2'-bipyridine, commonly found for similar compounds and 9-anthracene carboxylate, a fluorescent ligand added for theragnostic purposes. The resolution of the crystal structure of the MnII dinuclear compound shows a compression along the axis on the direction of the monodentate anthracene carboxylate. Moreover, by hydrolysis the one- dimensional system can be converted to the dinuclear compound. In the synthesis of the Mn(III) compound some oxidation of the anthracene is observed and two organic compounds are obtained, an anthraquinone and an ester formed by reaction between the quinone and the carboxylate. The manganese compounds were inserted into silica nanoparticles (NPs), resol (a polyphenol resin) -silica and carbon-silica hybrids in order to allow their vectorization and to study the compatibility of hybrid NPs with this type of system. This work explores the magnetic properties of the complexes and the luminescent properties of the coordination compounds and materials. The Mn(II) compounds show weak antiferromagnetic interaction, and the best way to differentiate these compounds is by EPR spectroscopy: the chain shows a unique band at g~2 while for the dinculear compound the spectrum is more complex, with several features at low fields. Magnetic properties of the Mn(III) compound confirms that it is a tetranuclear with butterfly type geometry with stronger antiferromagnetic interaction between the central ions than between central-terminal ions. The study of the porosity of the materials and the quantification of the presence of manganese inside the materials shows a good incorporation rate of the compounds. However it seems that the compounds are not present homogenously inside the support and that they are broken into smaller units. This is confirmed with the study of the magnetic properties of the hybrid [Mn]@NPs materials. In addition, fluoresecence measurement show that both the support and the compounds are luminescent but that both emission are strongly quenched when the compounds are inside the nanoparticles. The study of the optic properties of the materials show that a large amount of the compounds is released when the loaded silica and carbon-silica nanoparticles are redispersed in ethanol. However, resol-silica nanoparticles seem a lot more efficient to retain the complexes inside and apparently do not need further functionalization to achieve this goal. Finally, some preliminary test of disproportionation of H2O2 catalyzed by the manganese systems show low to moderate activity of Mn compounds in acetonitrile and paves the way for optimizing hybrid systems in aqueous media.

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Brown, Simon Brown. "Itinerant magnetism in manganese silicide". Thesis, University of Cambridge, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.335694.

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Turquet, François-Xavier. "Insertion of fluorescent manganese compounds – models of catalase – into mesoporous nanoparticles of silica, resol-silica and carbon-silica". Thesis, Lyon, 2018. http://www.theses.fr/2018LYSEN086.

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Les ROS (Reactive Oxygen Species), tels H2O2, HO● et O2-●, sont produites naturellementpar le métabolisme des êtres vivants. Cependant, elles peuvent apparaître en trop grandesquantités dans le cas de certaines maladies (Alzheimer, Parkinson, scléroses, cancers). Lasurproduction de ROS conduit à une mortalité des cellules plus élevée.Certains micro-oragnismes possèdent une enzyme à base de Mn capable de catalyser laréaction de dismutation du H2O2 en O2 et H2O. Plusieurs molécules ont été synthétisées pourreproduire ce procédé, cependant très peu d'entre elle sont actives en environnement aqueux.Récemment, des espèces synthétiques du Mn ont été introduites dans des silicesvoient même leur activité catalytique augmenter. Afin de perséverer dans cette voie, cettethèse présente de nouveaux composés de MnII (dinucléaire et chaîne) et MnIII(tetranucléaire) basés sur ce concept. Ils sont dotés de ligands fluorescents, ajoutés pour desfin théragnostiques. Ces composés ont été insérés dans des nanoparticules (NPs) de silice ethybrides carbone-silice afin, de permettre leur vectorisation et d'étudier la compatibilité desNPs hybrides avec ce type de système.Le travail fourni explore les propriétés magnétiques des complexes, les propriétésluminescentes des composés et matériaux et montre la bonne insertion des composés dans lesNPs hybrides, ne nécessitant pas, contrairement aux NPs de silice pure, de fonctionnalisationsupplémentaire pour la rétention des complexes. Il met aussi en évidence l'activité descomposés du Mn dans l'acétonitrile et ouvre des pistes pour une optimisation des systèmeshybrides en milieu aqueux.Le travail fourni explore les propriétés magnétiques des complexes, les propriétésluminescentes des composés et matériaux et montre la bonne insertion des composés dans lesNPs hybrides, ne nécessitant pas, contrairement aux NPs de silice pure, de fonctionnalisationsupplémentaire pour la rétention des complexes. Il met aussi en évidence l'activité descomposés du Mn dans l'acétonitrile et ouvre des pistes pour une optimisation des systèmeshybrides en milieu aqueux
ROS (Reactive Oxygen Species), such as H2O2, HO● and O2-●, are naturally produced by themetabolism of living beings. However, they can appear in large quantities in the case of certaindiseases (Alzheimer's, Parkinson's, sclerosis, cancer). Overproduction of ROS leads to highercell mortality.Some microorganisms have an Mn-based enzyme capable of catalyzing the disproportionationreaction of H2O2 into O2 and H2O. Several molecules have been synthesized to reproduce thisprocess, however very few of them are active in aqueous environment. Recently, synthetic Mn species have been introduced into mesoporous silica to protect themfrom the environment. Thus, these complexes of Mn are stable and even see their catalyticactivity increase. In order to persevere in this way, this thesis presents new compounds ofMnII (dinuclear and chain) and MnIII (tetranuclear) based on this concept. They havefluorescent ligands (9-anthracene carboxylate), added for theragnostic purposes. Thesecompounds were inserted into silica nanoparticles (Nps), resol (a polyphenol resin) -silica andcarbon-silica hybrids in order to allow their vectorization and to study the compatibility ofhybrid NPs with this type of system.This work explores the magnetic properties of the complexes, the luminescent properties of thecompounds and materials and shows the good insertion of the compounds into the hybrid NPs,not requiring, in contrast to pure silica NPs, additional functionalization for the retention of thecomplexes. It also highlights the activity of Mn compounds in acetonitrile and paves the wayfor optimizing hybrid systems in aqueous media

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Mogilatenko, Anna. "Electron Microscopy Characterization of Manganese Silicide Layers on Silicon". Doctoral thesis, Universitätsbibliothek Chemnitz, 2003. http://nbn-resolving.de/urn:nbn:de:swb:ch1-200300523.

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The present thesis reports on the transmission electron microscopy structure characterization of semiconducting thin films of higher manganese silicides (HMS or MnSi1.7) grown on (001)Si by different UHV deposition methods (the template method, reactive deposition and surfactant mediated reactive deposition). In this work electron diffraction technique was applied for the fist time to reveal the HMS phase growing in thin MnSi1.7 films. The obtained results suggest the presence of the shortest in c-axis length HMS phase, namely Mn4Si7, within our experiments. It has been shown that growth of epitaxial Mn4Si7 grains can be achieved by the template technique. In particular, the influence of the template thickness on the silicide layer quality has been investigated. It has been found that deposition of a thin Mn layer of 0.8 nm nominal thickness at room temperature prior to the Mn/Si codeposition at 550°C causes the formation of a silicide template that leads to the preferred epitaxial Mn4Si7 growth with (110)[4-41]Mn4Si7 || (001)[110]Si. Silicide crystallites of two additional orientation relations, (3-38)[-443]Mn4Si7 || (001)[110]Si and (001)[110] Mn4Si7 || (001)[110]Si, were present at the same template thickness to a lesser extent. Due to the crystal symmetry of Mn4Si7 and Si the epitaxial Mn4Si7 growth on (001)Si leads to the formation of a number of Mn4Si7 domains for each observed orientation. Additional experiments were carried out using the reactive deposition process. It has been shown that the deposition of Mn onto (001)Si at substrate temperatures higher then 600°C leads to the formation of large silicide islands growing with the major part of their elongated grains parallel to <110>Si. XRD investigations show the observed silicide grains to exhibit the following texture: (110)Mn4Si7 || (001)Si. The found island morphology of Mn4Si7 films can be modified by the deposition of about one monolayer of Sb (surfactant) onto (001)Si prior to the Mn-deposition. This process results in an increase of the silicide island density by about two orders of magnitude and decrease of the silicide grain dimensions to nanometer range. Furthermore, in the presence of Sb the silicide layers grow with the preferential orientation: (100)[010]Mn4Si7 || (001)[100]Si. The observed changes in the morphology and orientation of the Mn4Si7 layers can be explained by the reduced diffusion of Mn and Si atoms in the presence of the Sb overlayer
In der vorliegenden Arbeit wird die Struktur von dünnen MnSi1.7-Schichten, die mit verschiedenen UHV-Herstellungsmethoden (template-Verfahren, reaktive Abscheidung und surfactant gesteuerte Abscheidung) auf (001)Si hergestellt wurden, mittels Elektronenmikroskopie charakterisiert. Die Ergebnisse der Elektronenbeugung an dünnen Mangansilicid-Schichten können vollständig interpretiert werden, wenn von den bekannten höheren Mangansiliciden (HMS) das Mn4Si7 als einzige vorliegende Phase angenommen wird. Der Hauptteil der Arbeit beschäftigt sich mit den mittels template-Verfahren abgeschiedenen Mn4Si7-Schichten. In diesen Experimenten wurde der Einfluss der template-Dicke auf die Morphologie und Orientierung der hergestellten Schichten untersucht. Es wird gezeigt, dass bei der Abscheidung von einer dünnen Mn-Schicht mit einer nominalen Dicke von 0,8 nm bei Raumtemperatur und weiterer Mn/Si-Koabscheidung bei einer Substrattemperatur von 550°C nahezu geschlossene Silicidschichten mit der bevorzugten Orientierungsbeziehung (110)[4-41]Mn4Si7 || (001)[110]Si entstehen. Weiterhin wachsen bei dieser template-Dicke Mn4Si7-Kristallite mit den Orientierungsbeziehungen: (3-38)[-443]Mn4Si7 || (001)[110]Si und (001)[110] Mn4Si7 || (001)[110]Si. Bei jeder gefundenen Orientierungsbeziehung treten beim Wachstum von Mn4Si7 auf (001)Si mehrere Domäne auf. Zusätzliche Experimente wurden unter Verwendung der reaktiven Schichtabscheidung durchgeführt. Sie verdeutlichen, dass bei reaktiver Abscheidung von Mn auf (001)Si ab einer Substrattemperatur von 600°C ein Wachstum von Mn4Si7-Inseln entlang den [110]-Richtungen des Siliciums erfolgt. XRD-Untersuchungen zeigen, dass diese Inseln die folgende Textur haben: (110)Mn4Si7 || (001)Si. Durch eine Modifizierung der Si-Oberfläche mit einer bis zu einer Monolage dicken Sb-Schicht (surfactant) kann das Mn4Si7-Inselwachstum beeinflusst werden. Die dabei gefundene Erhöhung der Mn4Si7-Inseldichte wird hier auf die reduzierte Mn- und Si-Diffusion zurükgeführt. Weiterhin wurde gefunden, dass dieser Abscheidungsprozess Mn4Si7-Kristallite der bevorzugten Orientierung (100)[010]Mn4Si7 || (001)[110]Si liefert

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Libri sul tema "Manganese silicate"

Comba, P. CaF2-enhanced HC1 leaching of a manganese-bearing silicate ore. Washington, DC: Bureau of Mines, U.S. Dept. of the Interior, 1991.

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Comba, P. CaF₂-enhanced HCl leaching of a manganese-bearing silicate ore. Washington, D.C: U.S. Dept. of the Interior, Bureau of Mines, 1991.

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Mines, United States Bureau of. Thermodynamic Properties of Two Manganese Silicates, Pyroxmangite and Fowlerite. S.l: s.n, 1987.

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Dobrovský, Ludovít. Desoxidace oceli manganem, křemíkem, hliníkem a titanem. Praha: Academia, 1990.

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Manganese Treatment by the Addition of Sodium Silicate and Sodium Hypochlorite. Amer Water Works Assn, 1986.

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O, Bennington K., a cura di. Thermodynamic properties of two manganese silicates, pyroxmangite and fowlerite. Pittsburgh, Pa: U.S. Dept. of the Interior, Bureau of Mines, 1987.

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CO Hydrogenation Over Silica Supported Nickel-Manganese Catalysts. Manchester: UMIST, 1998.

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Capitoli di libri sul tema "Manganese silicate"

Sarbas, Bärbel, e Wolfgang Töpper. "Native Element, Solid Solution, Silicide, and Carbide". In Mn Manganese, 9–13. Berlin, Heidelberg: Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-662-08907-1_2.

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Underhill, Royale S., Krystal A. Stevens e Gary C. Fisher. "Surfactant Modified Nickel-Manganese-Gallium Powder and Silicone Composites". In Advances in Science and Technology, 35–40. Stafa: Trans Tech Publications Ltd., 2008. http://dx.doi.org/10.4028/3-908158-16-8.35.

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Miyazaki, Yuzuru, e Yuta Kikuchi. "Higher Manganese Silicide, $$\mathbf MnSi _{\varvec{\gamma }}$$ M nSi γ". In Thermoelectric Nanomaterials, 141–56. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-37537-8_7.

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Ghodke, Swapnil, A. Yamamoto, H. Ikuta e T. Takeuchi. "Thermoelectric Properties Higher Manganese Silicide Containing Small Amount of Mnsivsinano-Particles". In Ceramic Transactions Series, 113–22. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781119234531.ch10.

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Jorge, R. C. G. S., J. M. R. S. Relvas e F. J. A. S. Barriga. "Silica gel microtextures in siliceous exhalites at the Soloviejo manganese deposit, Spain". In Mineral Deposit Research: Meeting the Global Challenge, 631–34. Berlin, Heidelberg: Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/3-540-27946-6_161.

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"manganese silicate". In Dictionary Geotechnical Engineering/Wörterbuch GeoTechnik, 837. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-41714-6_130386.

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"silicate of manganese". In Dictionary Geotechnical Engineering/Wörterbuch GeoTechnik, 1231. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-41714-6_193569.

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Oueslati Omrani, Refka, Mohamed Jemal, Ismail Khattech e Ahmed Hichem Hamzaoui. "Structural and Calorimetric Studies of Zinc, Magnesium and Manganese Based Phosphate and Phosphate-Silicate Glasses". In Contemporary Topics about Phosphorus in Biology and Materials. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.88539.

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Tušar, Nataša Novak. "Manganese-modified porous silicates". In Zeolites and related materials: Trends, targets and challenges, Proceedings of the 4th International FEZA Conference, 73–78. Elsevier, 2008. http://dx.doi.org/10.1016/s0167-2991(08)80154-1.

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Jolivet, Jean-Pierre. "Titanium, Manganese, and Zirconium Dioxides". In Metal Oxide Nanostructures Chemistry. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780190928117.003.0011.

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The dioxides of titanium (TiO2), manganese (MnO2), and zirconium (ZrO2) are important materials because of their technological uses. TiO2 is used mainly as white pigment. Because of its semiconducting properties, TiO2, in its nanomaterial form, is also used as an active component of photocells and photocatalysis for self-cleaning glasses and cements . MnO2 is used primarily in electrode materials. ZrO2 is used in refractory ceramics, abrasive materials, and stabilized zirconia as ionic conductive materials stable at high temperature. Many of these properties are, of course, dependent on particle size and shape (§ Chap. 1). Dioxides of other tetravalent elements with interesting properties have been studied elsewhere in this book, especially VO2, which exhibits a metal–isolator transition at 68°C, used, for instance, in optoelectronics (§ 4.1.5), and silica, SiO2 (§ 4.1.4), which is likely the most ubiquitous solid for many applications and uses. Aqueous chemistry is of major interest in synthesizing these oxides in the form of nanoparticles from inorganic salts and under simple, cheap, and environmental friendly conditions. However, as the tetravalent elements have restricted solubility in water (§ 2.2), metal–organic compounds such as titanium and zirconium alkoxides are frequently used in alcoholic solution as precursors for the synthesis of TiO2 and ZrO2 nanoparticles. An overview of the conversion of alkoxides into oxides is indicated about silica formation (§ 4.1.4), and since well-documented works have already been published, these compounds are not considered here. The crystal structures of most MO2 dioxides are of TiO2 rutile type for hexacoordinated cations (e.g., Ti, V, Cr, Mn, Mo, W, Sn, Pb) and CaF2 fluorite type for octacoordinated, larger cations (e.g., Zr, Ce), but polymorphism is common. Some dioxides of elements such as chromium and tin form only one crystalline phase. So, hydrolysis of SnCl4 or acidification of stannate [Sn(OH)6]2− leads both to the same rutile-type phase, cassiterite, SnO2. Many other dioxides are polymorphic, especially TiO2, which exists in three main crystal phases: anatase, brookite, and rutile; and MnO2, which gives rise to a largely diversified crystal chemistry.

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Atti di convegni sul tema "Manganese silicate"

Popovici, Elisabeth-Jeanne, Laura Ungur, Cristina Ciocan, Crina Dan, Rodica Grecu, Flavia Forgaciu e D. Angelescu. "Synthesis of manganese-activated zinc silicate phosphor". In ROMOPTO 2000: Sixth Conference on Optics, a cura di Valentin I. Vlad. SPIE, 2001. http://dx.doi.org/10.1117/12.432857.

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Andini, D. T., E. Prasetyo e H. I. Qudus. "Oxidative fusion and alkaline leaching for manganese extraction from low grade silicate ore". In PROCEEDINGS OF THE 4TH INTERNATIONAL SEMINAR ON METALLURGY AND MATERIALS (ISMM2020): Accelerating Research and Innovation on Metallurgy and Materials for Inclusive and Sustainable Industry. AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0060058.

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Bogan, J., A. P. McCoy, C. Byrne, R. O'Connor e G. Hughes. "Atomic oxygen treatment of carbon containing low-k dielectric materials to facilitate manganese silicate barrier formation". In 2015 IEEE International Interconnect Technology Conference and 2015 IEEE Materials for Advanced Metallization Conference (IITC/MAM). IEEE, 2015. http://dx.doi.org/10.1109/iitc-mam.2015.7325628.

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Kamilov, T. S., D. K. Kabilov, I. S. Samiev, H. H. Husnutdinova, S. Dadamuhamedov e V. Klechkovskaya. "Growth technique and structural properties of the higher manganese silicide films". In ICT 2005. 24th International Conference on Thermoelectrics, 2005. IEEE, 2005. http://dx.doi.org/10.1109/ict.2005.1519933.

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Kamilov, T. S., D. K. Kabilov, S. Kh Babadjanov, R. Kh Kamilova, M. E. Azimov, V. V. Klechkovskaya, A. S. Orekhov e E. I. Suvorova. "About the Interface Between the Higher Manganese Silicide Film and Si (111)". In 2006 25th International Conference on Thermoelectrics. IEEE, 2006. http://dx.doi.org/10.1109/ict.2006.331317.

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Dedmon, Steven, e James M. Pilch. "The Development of Residual Micro-Stresses Surrounding Various Inclusion Types in Wheel Steel". In ASME 2009 Rail Transportation Division Fall Technical Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/rtdf2009-18009.

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Non-metallic inclusions are known to have deleterious affects on fatigue resistance of steels and other metals and alloys. Non-metallic inclusions reduce fatigue life by changing the micro-stresses in the vicinity of a propagating crack. But, some non-metallic types have a greater affect on fatigue life than other, more benign non-metallic types. Residual micro-stresses surrounding a non-metallic inclusion is proposed as one solution as to why these differences exist. Specifically investigated were the non-metallic types of Alumina, Silica and Manganese Sulfide — all of which are found to some extent in AAR M-107/M-208 Class C wheel steel.

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Kamilov, T. S., D. K. Kabilov, I. S. Samiev, H. H. Husnutdinova, R. H. Kamilova, S. Dadamuhamedov, V. V. Klechkovskaya, A. S. Orekhov e M. Takeda. "About the mechanism of formation and growth of the higher manganese silicide films on silicon". In ICT 2005. 24th International Conference on Thermoelectrics, 2005. IEEE, 2005. http://dx.doi.org/10.1109/ict.2005.1519975.

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Kamilov, T. S., D. K. Kabilov, I. S. Samiev, A. Z. Husanov e S. Dadamuhamedov. "The thermoelectric radiation detector based on the multielement structures of the higher manganese silicide films". In ICT 2005. 24th International Conference on Thermoelectrics, 2005. IEEE, 2005. http://dx.doi.org/10.1109/ict.2005.1520003.

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Shi, Xinghua, Zahra Zamanipour, Arash Mehdizadeh Dehkordi, Kenneth F. Ede, Jerzy S. Krasinski e Daryoosh Vashaee. "Cost Effective Synthesis of Bulk Thermoelectric Higher Manganese Silicide for Waste Heat Recovery and Environmental Protection". In 2012 IEEE Green Technologies Conference. IEEE, 2012. http://dx.doi.org/10.1109/green.2012.6200930.

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Ashraf, Shameed, Rahmad Haidzar Muhamad Husin e Fakhuma Ubaidillah Mohd Hafiz. "Effects of Well Cement Additive Particle Size and Density Towards Overall Blend Characterization". In IADC/SPE Asia Pacific Drilling Technology Conference. SPE, 2021. http://dx.doi.org/10.2118/201049-ms.

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Abstract Well cementing has evolved tremendously since its first application in the early 1900s. In the past, cement was mixed with water at the optimal ratio and combined with silica, bentonite, and additives according to the conditions of use. This simple formulation cannot serve the full breadth of oilfield applications. As a result, cement blend composition has evolved with advanced materials such as lightweight glass beads, cenospheres, polymeric beads, hematite, silica, manganese tetroxide, and many more. The wide variety of material used combined with poor understanding of the modern blend has resulted in operational issues, causing failures in blend delivery and execution. There have been cases of unfavorable blend leading to operation failure after it got stuck within the silo, unable to be pneumatically transferred. Some blend has high segregation potential, causing components to separate out, leading to problems in terms of mixing and having stable density during execution. The focus of this study is to establish a comprehensive understanding of modern cement blend additives for seamless operational execution. Several commonly used materials have been selected to form a case study of powder additive behavior. These materials are grouped into three categories: light, medium, and heavy density, with specific gravity between 0.1 and 1.9, 2.0 and 3.9, and 4.0 and 6.0 g/cm3, respectively. Each group is further divided into subcategories based on the particle sizes of fine, medium, and coarse. These materials are then characterized in terms of flowability factor, aeration energy, and compaction ratio, which consists of the Carr index and Hausner ratio. These are typical physical flow characteristics of the bulk solids. Results show that particle size and density significantly influence the flowability factor, aeration energy, and compaction ratio of a powder blend. In general, materials with fine particle size tend to have higher resistance to flow when evaluated through the flowability factor. Both medium- and coarse-particle additives tend to have higher flowability factor than fine-particle blends, that results in easier blend movement. Aeration energy requirements are much higher for high-density and coarse particles compared to medium and fine particles. The compaction ratio evaluation shows that coarse materials have lower tendency to compact compared to the fine and medium materials. Based on the established understanding of individual components, mixtures are then formed with the intention of improving the overall blend character. The poor characteristics of a high-density fine material are significantly improved by combining the fine material with a lightweight cenosphere. The high aeration energy requirements of heavy coarse particles can be halved by adding lightweight glass beads. For improved behavior, a different particle size of silica materials can be mixed at optimized ratio. Combining materials to obtain optimal particle-size distribution and density is crucial to ensuring an overall blend with favorable characteristics. The behavior of individual components based on particle size and density has paved the way for effective optimization of blends for seamless operational deliverables

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