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Descripción Taschenbuch. Condición: Neu. This item is printed on demand - it takes 3-4 days longer - Neuware -Thediscoveryofhightemperaturesuperconductors(HTS)in 1986bytwoIBM scientists led to an unprecedented explosion of research and development efforts world-wide because of the signi cant potential for practical applications offered by these materials. However, the early euphoria created by the exciting prospects was dampenedby the dauntingtask of fabricating these materials into useful forms with acceptablesuperconductingproperties. Progresstowardsthisgoalhasbeen hindered by many intrinsic materials problems, such as weak-links, ux-creep, and poor - chanicalproperties. TheearlieststudiesofcriticalcurrentdensityJ inHTSmaterialsrevealedthatfor c apolycrystallinematerialcontainingadistributionofgrainboundarie sismuchlower than that for a single crystal. High angle grain boundariesact as Josephson coupled weak-links leading to a signi cant eld-dependent suppression of the supercurrent acrosstheboundary. Forcleanstoichiometricboundaries,thegrainboundarycritical currentdensity dependsprimarilyonthe grainboundarymisorientation. The dep- denceof J (gb)onmisorientationanglehasbeendeterminedYBa O Cu (YBCO) c 2 3 7 in boundary types which can be formed in epitaxial lms on bicrystal substrates. Theseinclude[001]tilt,[100]tilt,and[100]twistboundaries. Ineachcasehighangle boundarieswerefoundtobeweak-linked. Theseexperimentshavealsobeenextended to arti cially fabricated [001] tilt bicrystals in Tl Ba CaCu O,Tl Ba Ca Cu O , 2 2 2 8 2 2 2 3 x TlBa Ca Cu O (Tl-1223) and Nd Ce CuO . In each case it was found that, 2 2 3 x 1. 85 0. 15 4 as in YBCO, J depends strongly on grain boundary misorientation angle. Data on c currenttransmissionacrossarti ciallyfabricatedgrainboundariesinBi-2212also- dicate that most large angle [001] tilt and [001] twist boundaries are weak links. It is likely that the variation in J with grain boundary misorientation is similar in all c high-T superconductors. Hence,thelow J observedinrandomlyorientedpolycr- c c tallineHTScanbeunderstoodonthebasisthatthepopulationoflowangleboundaries issmallandthatfrequenthighangleboundariesimpedelong-rangecurrent ow. - ingconventionalprocessingtechniques,threeHTSmaterialsweresuc cessfullyfab- catedinpolycrystallineformwithmodestJ s. ThesearetheBi-2223powder-in-tube c conductors,theTl-1223spray-pyrolyzed lmsandtheBi-2212melt-processedthick lms. Thesethreetypesofconductorscomprisedthe First-GenerationHTScond- torsorwires. 368 pp. Englisch. Nº de ref. del artículo: 9781441954787
Descripción Kartoniert / Broschiert. Condición: New. Dieser Artikel ist ein Print on Demand Artikel und wird nach Ihrer Bestellung fuer Sie gedruckt. Discusses the three methods to fabricate biaxially textured substratesIncludes chapters on various methods of HTS deposition Includes detailed chapters on other HTS materials such as the various Tl-based and Hg-based conductorsMetho. Nº de ref. del artículo: 4175798
Descripción Taschenbuch. Condición: Neu. Druck auf Anfrage Neuware - Printed after ordering - Thediscoveryofhightemperaturesuperconductors(HTS)in 1986bytwoIBM scientists led to an unprecedented explosion of research and development efforts world-wide because of the signi cant potential for practical applications offered by these materials. However, the early euphoria created by the exciting prospects was dampenedby the dauntingtask of fabricating these materials into useful forms with acceptablesuperconductingproperties. Progresstowardsthisgoalhasbeen hindered by many intrinsic materials problems, such as weak-links, ux-creep, and poor - chanicalproperties. TheearlieststudiesofcriticalcurrentdensityJ inHTSmaterialsrevealedthatfor c apolycrystallinematerialcontainingadistributionofgrainboundariesismuchlower than that for a single crystal. High angle grain boundariesact as Josephson coupled weak-links leading to a signi cant eld-dependent suppression of the supercurrent acrosstheboundary. Forcleanstoichiometricboundaries,thegrainboundarycritical currentdensity dependsprimarilyonthe grainboundarymisorientation. The dep- denceof J (gb)onmisorientationanglehasbeendeterminedYBa O Cu (YBCO) c 2 3 7 in boundary types which can be formed in epitaxial lms on bicrystal substrates. Theseinclude[001]tilt,[100]tilt,and[100]twistboundaries. Ineachcasehighangle boundarieswerefoundtobeweak-linked. Theseexperimentshavealsobeenextended to arti cially fabricated [001] tilt bicrystals in Tl Ba CaCu O,Tl Ba Ca Cu O , 2 2 2 8 2 2 2 3 x TlBa Ca Cu O (Tl-1223) and Nd Ce CuO . In each case it was found that, 2 2 3 x 1. 85 0. 15 4 as in YBCO, J depends strongly on grain boundary misorientation angle. Data on c currenttransmissionacrossarti ciallyfabricatedgrainboundariesinBi-2212also- dicate that most large angle [001] tilt and [001] twist boundaries are weak links. It is likely that the variation in J with grain boundary misorientation is similar in all c high-T superconductors. Hence,thelow J observedinrandomlyorientedpolycr- c c tallineHTScanbeunderstoodonthebasisthatthepopulationoflowangleboundaries issmallandthatfrequenthighangleboundariesimpedelong-rangecurrent ow. - ingconventionalprocessingtechniques,threeHTSmaterialsweresuccessfullyfab- catedinpolycrystallineformwithmodestJ s. ThesearetheBi-2223powder-in-tube c conductors,theTl-1223spray-pyrolyzed lmsandtheBi-2212melt-processedthick lms. Thesethreetypesofconductorscomprisedthe First-GenerationHTScond- torsorwires. Nº de ref. del artículo: 9781441954787
Descripción Condición: New. Editor(s): Goyal, Amit. Num Pages: 347 pages, biography. BIC Classification: PHU; TGM; THR. Category: (P) Professional & Vocational. Dimension: 234 x 156 x 19. Weight in Grams: 516. . 2010. 1st ed. Softcover of orig. ed. 2005. Paperback. . . . . Nº de ref. del artículo: V9781441954787
Descripción Condición: New. Editor(s): Goyal, Amit. Num Pages: 347 pages, biography. BIC Classification: PHU; TGM; THR. Category: (P) Professional & Vocational. Dimension: 234 x 156 x 19. Weight in Grams: 516. . 2010. 1st ed. Softcover of orig. ed. 2005. Paperback. . . . . Books ship from the US and Ireland. Nº de ref. del artículo: V9781441954787