In situ resistance measurements have been used to investigate the oxygen out- and in-diffusion in YBa2Cu3O7 - x oxide. The oxygen content has been measured by nuclear reaction and by weighing; X-ray diffraction has been used to determine the crystalline structure. Polycrystalline sintered material has been used. Out-diffusion has been investigated by heating samples with x = 0.1 in argon atmosphere at fixed temperature and as a function of the time. The resistance increases exponentially and reaches saturation after 5000 min at 550 °C. The oxygen content, after an initial decrease which occurs in the first 100 min, remains constant. Order-disorder transformation can be responsible for the exponential increase in resistance. The in-diffusion has been studied with a material having x = 0.65 heated in oxygen. As a function of the time the resistance curves continuously decrease and present two slopes: fast at the beginning and slow after a certain time. At first the material is tetragonal and non-superconducting. The sharp decrease in resistivity can be attributed to the presence of a thin continuous conductive skin around the grain or, more likely, to a disorder-order transformation activated by the presence of oxygen and involving a large part of the material. © 1989.

Out- and in-diffusion of oxygen in YBa2Cu3O7 - x oxide / Ottaviani, G.; Nobili, C.; Nava, F.; Affronte, M.; Manfredini, T.; Matacotta, F. C.; Galli, E.. - In: JOURNAL OF THE LESS-COMMON METALS. - ISSN 0022-5088. - 150:C(1989), pp. 177-183. [10.1016/0022-5088(89)90268-3]

Out- and in-diffusion of oxygen in YBa2Cu3O7 - x oxide

Ottaviani G.;Nobili C.;Affronte M.;Manfredini T.;
1989

Abstract

In situ resistance measurements have been used to investigate the oxygen out- and in-diffusion in YBa2Cu3O7 - x oxide. The oxygen content has been measured by nuclear reaction and by weighing; X-ray diffraction has been used to determine the crystalline structure. Polycrystalline sintered material has been used. Out-diffusion has been investigated by heating samples with x = 0.1 in argon atmosphere at fixed temperature and as a function of the time. The resistance increases exponentially and reaches saturation after 5000 min at 550 °C. The oxygen content, after an initial decrease which occurs in the first 100 min, remains constant. Order-disorder transformation can be responsible for the exponential increase in resistance. The in-diffusion has been studied with a material having x = 0.65 heated in oxygen. As a function of the time the resistance curves continuously decrease and present two slopes: fast at the beginning and slow after a certain time. At first the material is tetragonal and non-superconducting. The sharp decrease in resistivity can be attributed to the presence of a thin continuous conductive skin around the grain or, more likely, to a disorder-order transformation activated by the presence of oxygen and involving a large part of the material. © 1989.
150
C
177
183
Out- and in-diffusion of oxygen in YBa2Cu3O7 - x oxide / Ottaviani, G.; Nobili, C.; Nava, F.; Affronte, M.; Manfredini, T.; Matacotta, F. C.; Galli, E.. - In: JOURNAL OF THE LESS-COMMON METALS. - ISSN 0022-5088. - 150:C(1989), pp. 177-183. [10.1016/0022-5088(89)90268-3]
Ottaviani, G.; Nobili, C.; Nava, F.; Affronte, M.; Manfredini, T.; Matacotta, F. C.; Galli, E.
File in questo prodotto:
Non ci sono file associati a questo prodotto.
Pubblicazioni consigliate

Caricamento pubblicazioni consigliate

Licenza Creative Commons
I metadati presenti in IRIS UNIMORE sono rilasciati con licenza Creative Commons CC0 1.0 Universal, mentre i file delle pubblicazioni sono rilasciati con licenza Attribuzione 4.0 Internazionale (CC BY 4.0), salvo diversa indicazione.
In caso di violazione di copyright, contattare Supporto Iris

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11380/1248799
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 15
  • ???jsp.display-item.citation.isi??? 13
social impact