عنوان

Preparation and characterization of yttrium barium(2) copper(3) oxygen(7-x) high critical transition temperature superconductor

شماره

TLpq230729704

زبان متن نوشتاري يا گفتاري و مانند آن

انگلیسی

عنوان اصلي

Preparation and characterization of yttrium barium(2) copper(3) oxygen(7-x) high critical transition temperature superconductor

نام عام مواد

[Thesis]

نام نخستين پديدآور

M. A.-R. Redwan

نام ناشر، پخش کننده و غيره

King Fahd University of Petroleum and Minerals (Saudi Arabia)

تاریخ نشرو بخش و غیره

1991

نام خاص و کميت اثر

196

جزئيات پايان نامه و نوع درجه آن

M.S.

کسي که مدرک را اعطا کرده

King Fahd University of Petroleum and Minerals (Saudi Arabia)

امتياز متن

1991

متن يادداشت

Superconductor samples of YBa2Cu3O7-x were prepared by two different methods. Measurements using XRD, SEM, EPMA, and four probe method indicated single phased samples with orthorhombic structure and transition temperature of 92 K. Samples were further studied by XPS and UPS techniques, where representative clean surfaces were prepared by in-situ scraping. Valence band spectra show low density of states at Fermi level and strongly hybridized O 2p and Cu 3d states. The position, shape, and satellite emission of Cu 2p indicate a mixture of Cu and Cu valencies. The O 1s two components are intrinsic and the 531 eV peak is related to oxygen hole states (O). Ba core levels show a two component structure, suggesting two principal Ba-O configurations due to oxygen vacancies. The position and shape of Y doublets indicate weak Y-O interactions. Annealling in UHV causes an increase in O vacuncies and a reduction of Cu valency. Water exposure causes the formation of hydroxides at the surface, while oxygen exposure has no significant effect.

موضوع مستند نشده

Condensation

موضوع مستند نشده

Pure sciences

مستند نام اشخاص تاييد نشده

M. A.-R. Redwan

نام الکترونيکي

فرمت انتشار

p

نوع ماده

[Thesis]

کد کاربرگه

276903

سطح دسترسي

a

تكميل شده

Y