An in situ powder diffraction study of the structural mixed-phase of YBa2Cu3O6+x at 200 and 300C
Author(s):
Abstract:
In this study, the YBa2Cu3O6+x samples at temperatures 200 and 300C, as the value of x (the oxygen content in 0the basal plane) increased under nearly thermodynamical equilibrium condition, the structure changed from the well- known tetragonal (T) to a mixed-phase (T+OII) region (orthorhombicII phase is a superstructure). This mixed-phase region suggests a first order T/OII phase transition with the expected linear change in the volume fraction of each phase (phase lever rule). The existence of a stable whole OII phase region around x 0.7 at 300C, which is indicated by extrapolation, implies a substantial correction on the YBCO’s structural phase diagram. From the full analyses of the data by Reitveld Method, the possibility of the formation of another superstructure along the c direction can not be ruled out (broadening of [00l] reflections which, presumably comes from anti phase boundary effects). By inserting the structure factor of the OII phase, we have been able to study this phase quantitatively.
Language:
Persian
Published:
Iranian Journal of Crystallography and Mineralogy, Volume:15 Issue: 1, 2007
Pages:
243 to 250
https://magiran.com/p730528
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