Structural modulations of Bi sub 2 Sr sub 2 CuO sub 6 studied by in situ x-ray diffraction

Journal Article · Mon Sep 23 04:00:00 EDT 1991 · Applied Physics Letters; (United States)

DOI:https://doi.org/10.1063/1.106282· OSTI ID:5237593

Shen, Y; Richards, D R; Hinks, D G; Mitchell, A W ^[1]

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1. Materials Science Division and Science and Technology Center for Superconductivity, Argonne National Laboratory, Argonne, Illinois (USA)

High-temperature x-ray diffraction has been carried out on a superconducting single-phase sample of pseudo-tetragonal Bi{sub 2}Sr{sub 2}CuO{sub 6+{ital y}}, which was obtained from crystallization of thin glassy platelets. The sample displayed (00{ital l}) preferred orientation, which made it possible to determine the incommensurate modulation by conventional {theta}{minus}2{theta} x-ray scans. The existence of the modulation peaks (800 {degree}C) indicates that the modulation cannot be caused solely by oxygen ordering. As temperature increased, it was observed that a decrease in the intensity of modulation lines was associated with an increase in intensity of fundamental reflection, which was similar to the order-disorder phase transition. By removing 0.045(5) oxygen atom per formula unit, the components of modulation satellites along the {ital b}* and {ital c}* directions changed from {ital b}{sub mod}=0.183(9) and {ital c}{sub mod}=0.315(4) to 0.184(6) and 0.260(4), respectively. This demonstrates that oxygen, while not the sole cause, does play a role in the formation of the structural modulation. However, the invariance of {ital b}{sub mod} with respect to the change in oxygen content does not support the model which explained the modulation by inserting extra oxygen in BiO plane.

• OSTI ID: 5237593
• Journal Information: Applied Physics Letters; (United States), Journal Name: Applied Physics Letters; (United States) Vol. 59:13; ISSN APPLA; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ALKALINE EARTH METAL COMPOUNDS
AMINES
AMMONIUM COMPOUNDS
ANL
BISMUTH COMPOUNDS
BISMUTH OXIDES
CHALCOGENIDES
COHERENT SCATTERING
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OXIDES
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QUATERNARY COMPOUNDS
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STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
US AEC
US DOE
US ERDA
US ORGANIZATIONS
X-RAY DIFFRACTION