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2011 | 9 | 1 | 213-221
Tytuł artykułu

Effects of low-level La doping and ageing on TlPb-1223 high T c superconductors

Treść / Zawartość
Warianty tytułu
Języki publikacji
EN
Abstrakty
EN
Bulk samples of the nominal composition of (Tl0.6Pb0.5)(Sr0.8Ba0.2)2Ca2Cu3O8+δ−xLaO1.5 (x = 0–0.1) were prepared by using two-step process and their microstructure, T c values, and magnetization were studied. The samples consist of the Tl-1223 dominant phase with small Tl-1212 admixture, which increases with a rise of La content. Five years ageing and following oxygen annealing at 450°C and subsequently at 750°C have only a modest effect on T c values of the studied samples. Low-level La doping (x = 0:04) leads to an increase of T c values by about 2 K in comparison with undoped samples. Oxygen annealing at 750°C results in an increase in the volume magnetization hysteresis in low applied magnetic fields and rise of critical current density at zero magnetic field and 77 K. This effect is most pronounced for the low La doped sample with x = 0.04. Changes of the induced voltage, U originating in the Meissner effect and of its harmonics in dependence on temperature were measured and used for characterization of the temperature distribution of inter-grain junctions.
Wydawca
Czasopismo
Rocznik
Tom
9
Numer
1
Strony
213-221
Opis fizyczny
Daty
wydano
2011-02-01
online
2010-09-24
Twórcy
  • Institute of Measurement Science, Slovak Academy of Sciences, 841 04, Bratislava, Slovak Republic
  • Department of Inorganic Chemistry, Faculty of Natural Sciences, Comenius University, 842 15, Bratislava, Slovak Republic , plesch@fns.uniba.sk
  • Institute of Measurement Science, Slovak Academy of Sciences, 841 04, Bratislava, Slovak Republic
  • Institute of Measurement Science, Slovak Academy of Sciences, 841 04, Bratislava, Slovak Republic
autor
  • Institute of Measurement Science, Slovak Academy of Sciences, 841 04, Bratislava, Slovak Republic
  • Institute of Measurement Science, Slovak Academy of Sciences, 841 04, Bratislava, Slovak Republic
  • Institute of Measurement Science, Slovak Academy of Sciences, 841 04, Bratislava, Slovak Republic
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Typ dokumentu
Bibliografia
Identyfikatory
Identyfikator YADDA
bwmeta1.element.-psjd-doi-10_2478_s11534-010-0042-8
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