Title
Electron-microscopy investigation of superconducting la2cu(o, f)4+y oxyfluoride Electron-microscopy investigation of superconducting la2cu(o, f)4+y oxyfluoride
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
Paris ,
Subject
Chemistry
Source (journal)
European journal of solid state and inorganic chemistry. - Paris
Volume/pages
30(1993) :11 , p. 1095-1108
ISSN
0992-4361
ISI
A1993MX13500006
Carrier
E
Target language
English (eng)
Abstract
The fluorination of La2CuO4 can lead to different oxyfluoride compounds depending on the TF2 temperature of the fluorine gas treatment. When 150-degrees-C T(F2) less-than-or-equal-to 200-degrees-c less-than-or-equal-to 200-degrees-C a superconducting material is obtained. Previous neutron diffraction experiments as well as the EXAFS measurements at the La L(III) edge indicate that extra anions lie in an interstitial site between the two (LaO) layers. Electron diffraction patterns clearly show the existence of an incommensurate modulation due to the presence of shear planes. A second phase is also pointed out which can be obtained as a major component when the fluorination temperature is raised to 230-degrees-C. This phase which is not a superconductor crystallizes with the monoclinic symmetry.
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