AN IN SITU POWDER DIFFRACTION STUDY OF THE STRUCTURAL MIXED-PHASE OF YBA2CU3O6+X AT 200 AND 300°C

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KHOUSHNEVISAN B.; ROSS D.K.

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Journal: Iranian Journal of Crystallography and Mineralogy Year:2007 | Volume:15 | Issue:1 Page(s): 243-250

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Title

AN IN SITU POWDER DIFFRACTION STUDY OF THE STRUCTURAL MIXED-PHASE OF YBA2CU3O6+X AT 200 AND 300°C

Author(s)

KHOUSHNEVISAN B. | ROSS D.K. | Issue Writer Certificate

Keywords

ORTHORHOMBIC IIQ3

SUPERSTRUCTUREQ3

YBCOQ3

Abstract

In this study, the YBa2Cu3O6+x samples at temperatures 200 and 300oC, 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 300oC, 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.

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APA: Copy

KHOUSHNEVISAN, B., & ROSS, D.K.. (2007). AN IN SITU POWDER DIFFRACTION STUDY OF THE STRUCTURAL MIXED-PHASE OF YBA₂CU₃O_6+X AT 200 AND 300°C. IRANIAN JOURNAL OF CRYSTALLOGRAPHY AND MINERALOGY, 15(1), 243-250. SID. https://sid.ir/paper/3907/en

Vancouver: Copy

KHOUSHNEVISAN B., ROSS D.K.. AN IN SITU POWDER DIFFRACTION STUDY OF THE STRUCTURAL MIXED-PHASE OF YBA₂CU₃O_6+X AT 200 AND 300°C. IRANIAN JOURNAL OF CRYSTALLOGRAPHY AND MINERALOGY[Internet]. 2007;15(1):243-250. Available from: https://sid.ir/paper/3907/en

IEEE: Copy

B. KHOUSHNEVISAN, and D.K. ROSS, “AN IN SITU POWDER DIFFRACTION STUDY OF THE STRUCTURAL MIXED-PHASE OF YBA₂CU₃O_6+X AT 200 AND 300°C,” IRANIAN JOURNAL OF CRYSTALLOGRAPHY AND MINERALOGY, vol. 15, no. 1, pp. 243–250, 2007, [Online]. Available: https://sid.ir/paper/3907/en

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