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
- CNR
- INFM
- Universidade Estadual Paulista (UNESP)
- Univ Rome La Sapienza
- 0921-4534
- 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.
- 1-Sep-1998
- Physica C. Amsterdam: Elsevier B.V., v. 305, n. 3-4, p. 251-261, 1998.
- 251-261
- Elsevier B.V.
- La2CuO4+delta
- interstitial O
- O mobility
- doping efficiency
- anelastic spectroscopy
- http://dx.doi.org/10.1016/S0921-4534(98)00301-3
- Acesso restrito
- outro
- http://repositorio.unesp.br/handle/11449/34266
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