magnesium diboride (29 Ergebnisse)

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Taschenbuch. Zustand: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -Owing to the high critical temperature (Tc) of 40 K, intrinsically 'weak-link' free grain boundaries, and low fabrication cost, MgB2 is believed to be promising for replacing conventional low Tc superconductors in many cryogen- free applications. Nevertheless, its rapid drop in critical current under applied magnetic field and low critical field exclude it from many industrial applications where a high critical current density (Jc) under high magnetic field is required. Many studies have shown that carbon containing dopants are effective means to enhance the field dependence of Jc and the upper critical field (Hc2) of MgB2. This book describes extensive research efforts towards the improvement of the superconducting properties of MgB2 through graphene/ graphene oxide doping and explains the improvements in relation to the electromagnetic behaviour. This book further describes experimental details of graphene/graphene oxide production techniques. Therefore, this book should be of interest to a broad range of multidisciplinary researchers dealing with graphene, MgB2 superconductor, and their performances. 156 pp. Englisch.

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Taschenbuch. Zustand: Neu. nach der Bestellung gedruckt Neuware - Printed after ordering - Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Yttrium boride refers to a crystalline material composed of different proportions of yttrium and boron, such as YB2, YB4, YB6, YB12, YB25, YB50 and YB66. They are all dark, hard solids having high melting temperatures. The most common form is the yttrium hexaboride YB6. It exhibits superconductivity at relatively high temperature of 8.4 K and, similar to LaB6, is an electron cathode. Another remarkable yttrium boride is YB66. It has large lattice constant (2.344 nm), high thermal and mechanical stability, and therefore is used as a diffraction grating for soft synchrotron radiation (1-2 keV). Yttrium diboride has the same hexagonal crystal structure as aluminium diboride and magnesium diboride - an important superconducting material. In this structure, the boron atoms form graphite like sheets with yttrium atoms between them. YB2 crystals are unstable to moderate heating in air - they start oxidizing at 400 °C and completely oxidize at 800 °C. YB2 melts at ~2220 °C.

Zustand: New. Dieser Artikel ist ein Print on Demand Artikel und wird nach Ihrer Bestellung fuer Sie gedruckt. Autor/Autorin: De Silva Kaludewa SujeewaK.S.B. De Silva, PhD, Research Fellow, ISEM, University of Wollongong, NSW, Australia: Studies Superconductivity in MgB2.X.Xu, PhD, ARC Postdoctoral Fellow (industry),ISEM, University of Wollongong, NSW, Aust.

Kartoniert / Broschiert. Zustand: New. Dieser Artikel ist ein Print on Demand Artikel und wird nach Ihrer Bestellung fuer Sie gedruckt. Autor/Autorin: Shcherbakova Olga V.Olga V. Shcherbakova, PhD, Research Fellow, ISEM, University of Wollongong, Australia: studies superconductivity in MgB2. Alexey V. Pan, PhD, Assoc. Professor, ISEM: investigates superconductivity and magnetism.

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Taschenbuch. Zustand: Neu. nach der Bestellung gedruckt Neuware - Printed after ordering - It has been shown that the complicating factors in fabrication of magnesium diboride samples, such as high sensitivity of Mg to oxidation and the high Mg vapor pressure, can be overcome to realize superconducting thin films and the best results have been achieved by the so-called all-in-situ method. Films produced by this method could be used for fundamental studies of the superconducting properties of MgB2 and they were also suitable for the devices fabrication due to their smoothness and good superconducting properties. In this respect, a magnetometer with directly coupled pick-up loop has been fabricated based on those films. The device incorporated two nanobridges as weak links in the superconducting pick-up loop. The calculated effective area at 0 K of the magnetometer was 0.27 mm2 and its sensitivity to the external flux was 7.4 nT. The effective flux noise was 1.3 pT/Hz1/2 at 14 K, which is sensitive enough for recording adult MCG. This is a satisfactory result and illustrates that magnesium diboride is a very promising material for electronic applications.

Taschenbuch. Zustand: Neu. nach der Bestellung gedruckt Neuware - Printed after ordering - Magnesium Diboride (MgB2) is a newcomer in the fieldof superconductors.It offers an easily attainable usage temperaturearound 20 K with cheap wire cost. However, the wiresemploy different matrix materials than superconductorengineers are used to use. These, in principle,result in reduced stability. Also, ferromagneticcomponents may be included, which causespeculiarities in the modelling of coil criticalcurrent. This book considers stability issues of MgB2superconductors, while also discussing on thecomputation of coil critical current when a wireincludes ferromagnetic matrix. A detailed outline isalso given in the background of the book;electromagnetism, thermodynamics andsuperconductivity are discussed in a reasonableextent. Then, stability models, as well as a varietyof measurement results, are presented and discussedin detail. This book gives an outstanding opportunityto familiarise oneself with the stability ofsuperconductors and especially for modelling therelated phenomena. The book works as a good guidelinefor both the young beginning researchers and thesenior scientists with its remarkable effort on pedagogy.

Taschenbuch. Zustand: Neu. Fabrication and characterization of MgB2 thin films and devices | Fabrication and characterization of Magnesium Diboride thin films by co-evaporartion and of an MgB2 SQUID magnetometer | Chiara Portesi | Taschenbuch | 92 S. | Englisch | 2010 | LAP LAMBERT Academic Publishing | EAN 9783838364254 | Verantwortliche Person für die EU: preigu GmbH & Co. KG, Lengericher Landstr. 19, 49078 Osnabrück, mail[at]preigu[dot]de | Anbieter: preigu Print on Demand.

Taschenbuch. Zustand: Neu. This item is printed on demand - Print on Demand Titel. Neuware -Owing to the high critical temperature (Tc) of 40 K, intrinsically 'weak-link' free grain boundaries, and low fabrication cost, MgB2 is believed to be promising for replacing conventional low Tc superconductors in many cryogen- free applications. Nevertheless, its rapid drop in critical current under applied magnetic field and low critical field exclude it from many industrial applications where a high critical current density (Jc) under high magnetic field is required. Many studies have shown that carbon containing dopants are effective means to enhance the field dependence of Jc and the upper critical field (Hc2) of MgB2. This book describes extensive research efforts towards the improvement of the superconducting properties of MgB2 through graphene/ graphene oxide doping and explains the improvements in relation to the electromagnetic behaviour. This book further describes experimental details of graphene/graphene oxide production techniques. Therefore, this book should be of interest to a broad range of multidisciplinary researchers dealing with graphene, MgB2 superconductor, and their performances.VDM Verlag, Dudweiler Landstraße 99, 66123 Saarbrücken 156 pp. Englisch.

Taschenbuch. Zustand: Neu. nach der Bestellung gedruckt Neuware - Printed after ordering - Owing to the high critical temperature (Tc) of 40 K, intrinsically 'weak-link' free grain boundaries, and low fabrication cost, MgB2 is believed to be promising for replacing conventional low Tc superconductors in many cryogen- free applications. Nevertheless, its rapid drop in critical current under applied magnetic field and low critical field exclude it from many industrial applications where a high critical current density (Jc) under high magnetic field is required. Many studies have shown that carbon containing dopants are effective means to enhance the field dependence of Jc and the upper critical field (Hc2) of MgB2. This book describes extensive research efforts towards the improvement of the superconducting properties of MgB2 through graphene/ graphene oxide doping and explains the improvements in relation to the electromagnetic behaviour. This book further describes experimental details of graphene/graphene oxide production techniques. Therefore, this book should be of interest to a broad range of multidisciplinary researchers dealing with graphene, MgB2 superconductor, and their performances.

Taschenbuch. Zustand: Neu. nach der Bestellung gedruckt Neuware - Printed after ordering - Present work on superconducting multiband MgB2 was started to sort out some relevant question such as how does the band scattering mechanism behaves with density and type of extrinsic defects, How does the pinning force constant in the intergrain and intragrain regions compare with other low Tc and high Tc superconductors With the introduction of defects, is there some reflection of the changing scattering mechanism on the rf penetration depth Ion irradiation was used to create extrinsic defects in MgB2 and we found that band scattering mechanisms can be selectively tuned with the type of extrinsic defects. Study of variation in rf penetration depth shows evidence for very strong intergrain pinning it also reflected the modification in the band scattering. We compare the Bulk pinning force constant, intergrain connectivity and broadening of superconducting transition of MgB2 with Bi2Sr2Ca2Cu3O10 and NbSe2 and analyze the magnetoresistance data for MgB2 in the context of thermally activated flux flow behavior and compare vortex activation energy and provide evidence of Arrhenius behavior in the MgB2 samples. The possibilities & future extension of this work is also presented.

Taschenbuch. Zustand: Neu. nach der Bestellung gedruckt Neuware - Printed after ordering - Discovered in 2001, MgB2 superconductor with the critical temperature of 39 K is one of the most promising candidates for high-current applications (magnets for magnetic resonance imaging, etc.). However, to utilize its properties, the current carrying ability of MgB2 should be enhanced. An important breakthrough is achieved by converting it into MgB2-xCx superconductor. This book describes extensive research efforts on development of MgB2- xCx superconductors and understanding their electromagnetic behaviour. Comprehensive study of microstructural and superconducting properties of MgB2 with different C-based dopants allowed us to (i) develop an advanced approach for the C-doping; (ii) classify a broad range of dopants and evaluate their effectiveness for enhancing the required properties of MgB2; (iii) identify factors affecting current-carrying ability in MgB2-xCx at high and low magnetic fields. This book should be of interest to a broad range of multidisciplinary scientists, engineers, technologists, product developers, and students dealing with MgB2 superconductor, its development, performance, and optimization for various practical applications.

Taschenbuch. Zustand: Neu. Yttrium Borides | Superconductivity, Synchrotron, Aluminium Diboride, Magnesium Diboride, Tetragonal | Lambert M. Surhone (u. a.) | Taschenbuch | Englisch | 2026 | OmniScriptum | EAN 9786131043659 | Verantwortliche Person für die EU: preigu GmbH & Co. KG, Lengericher Landstr. 19, 49078 Osnabrück, mail[at]preigu[dot]de | Anbieter: preigu Print on Demand.

Taschenbuch. Zustand: Neu. Boron | Boron, Rhombohedral crystal system, Tetragonal crystal system, Orthorhombic crystal system, Boric acid, Borate, Borosilicate glass, Boron carbide, Boron nitride, Boron trioxide, Magnesium diboride, Borax, Rhenium diboride | Frederic P. Miller (u. a.) | Taschenbuch | Englisch | 2026 | OmniScriptum | EAN 9786130004033 | Verantwortliche Person für die EU: preigu GmbH & Co. KG, Lengericher Landstr. 19, 49078 Osnabrück, mail[at]preigu[dot]de | Anbieter: preigu Print on Demand.