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Please use this identifier to cite or link to this item: http://acervodigital.unesp.br/handle/11449/34266
Title: 
Structure, mobility and clustering of interstitial O in La2CuO4+delta in the limit of small delta
Author(s): 
Institution: 
  • CNR
  • INFM
  • Universidade Estadual Paulista (UNESP)
  • Univ Rome La Sapienza
ISSN: 
0921-4534
Abstract: 
Anelastic spectra (elastic energy absorption as a function of temperature) are reported which provide evidence that excess O in La2CuO4+delta starts forming two different types of defects already at very low concentrations, where no phase separation or changes in the type of O intercalation are believed to occur. The absorption peak with the lowest activation enthalpy, H/k(B) = 5600 K, is visible at lowest values of delta and is attributed to the hopping of single interstitial O2- ions. The second process, with a slightly slower dynamics, appears at higher values of delta and soon becomes preponderant over the former process. The latter process is proposed to be due to stable pairs of O atoms and is put in connection with the formation of partially covalent bonds between interstitial and apical oxygen; such bonds would reduce the doping efficiency of excess O at increasing delta. The geometry of the interstitial O defect is discussed. O 1998 Published by Elsevier B.V. B.V. All rights reserved.
Issue Date: 
1-Sep-1998
Citation: 
Physica C. Amsterdam: Elsevier B.V., v. 305, n. 3-4, p. 251-261, 1998.
Time Duration: 
251-261
Publisher: 
Elsevier B.V.
Keywords: 
  • La2CuO4+delta
  • interstitial O
  • O mobility
  • doping efficiency
  • anelastic spectroscopy
Source: 
http://dx.doi.org/10.1016/S0921-4534(98)00301-3
URI: 
Access Rights: 
Acesso restrito
Type: 
outro
Source:
http://repositorio.unesp.br/handle/11449/34266
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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