Dresden 2009 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 5: Postersession Superconductivity: Materials - Fabrication and Properties
TT 5.20: Poster
Montag, 23. März 2009, 13:00–16:45, P1A
An influence of gamma irradiation on oxygen mobility in YBa2Cu3O7−δ — •Anis Saad1, Mikalai Kalanda2, and Sergey Demyanov2 — 1Al-Balqua Applied University, Salt, Jordan — 2Scientific-Practical Materials Research Centre NAS of Belarus, Minsk, Belarus
It is known, that in the process of irradiation, physical-chemical properties of YBa2Cu3O7−δ considerably change due to the formation of radiation defects of various kind.
The most effective way of investigation of the Co60 isotope gamma ray irradiation effect on oxygen exchange dynamics and anions redistribution in CuOx crystal structure planes of HTS YBa2Cu3O7−δ compound is a plotting of superconducting critical temperature Tc, the superconducting transition temperature width Δ Tc and crystal lattice parameters difference Δ (b−a) dependences on irradiation dose.
In this way, as a result of comparison of Tc and Δ Tc values for irradiated high-density sample and non-irradiated high-density sample, respectively, it was determined that the gamma irradiation with energy 1.25 MeV, subsequent annealing at temperature 770 K and oxygen partial pressure pO2 = 5 x 105 Pa during 12 h, leads to the Tc and Δ (b−a) values rise and decrease of Δ Tc value.
One can suppose that during the Co60 isotope gamma ray irradiation, radiation defects are formed which promote ionization of oxygen atoms. This process promotes redistribution of anions in CuOx chained layers and stimulates oxygen sorption-desorption processes in the studied structures.