22 December 1998 Thermal- and radiation-induced changes of structure and luminescence properties of YBa2 Cu3 O7-x ceramics
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Abstract
Spectra of thermo- and X-ray-luminescence (TL and RL) were studied in the samples of YBa2Cu3O7-x ceramics with different initial defects subjected to high temperature treatment in vacuum at T equals 200 - 900 degrees Celsius and to the high dose (gamma) - and n-(gamma) -irradiations. The unirradiated samples of the single phase YBaCuO-ceramics containing only orthophase do not show the RL and TL. After thermal treatment of these samples at T equals 500 degrees Celsius the RL with maximum at 500 - 560 nm appears and after annealing at T equals 850 degrees Celsius two TL peaks with Tmax equals 90 and 130 - 170 K are found, both coinciding with maxima of the RL and TL observed in the multiphase YBaCuO-ceramics, containing the thetra- and impurity dielectric phases. It was established that the luminescence centers are not created in the superconducting (SC) orthophase of these ceramics and are due to both native oxygen vacancies and those generated by thermal treatment and (gamma) - and n- (gamma) -irradiations which are localized in the thetra- and impurity phases. The contribution of the n-generated defects into luminescence centers formation prevails at F greater than or equal to 1017 neutrons/cm2. It was shown that the (gamma) -component of the n-(gamma) -radiation plays the dominant role in the defect formation at F less than or equal to 1016 neutrons/cm2 and the neutron component does at F less than 1016 neutrons/cm2.
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Rano R. Gulamova, Rano R. Gulamova, Eldar M. Gasanov, Eldar M. Gasanov, Rustam Alimov, Rustam Alimov, Gen Chan Kim, Gen Chan Kim, } "Thermal- and radiation-induced changes of structure and luminescence properties of YBa2 Cu3 O7-x ceramics", Proc. SPIE 3481, Superconducting and Related Oxides: Physics and Nanoengineering III, (22 December 1998); doi: 10.1117/12.335906; https://doi.org/10.1117/12.335906
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