Home << 1 >>
List View
 | 
Citations
 | 
Details
   web
Record
Author Krekels, T.; Kaesche, S.; Van Tendeloo, G.
Title 2√2 ap x 2√ ap phase in superconducting ceramics Type A1 Journal article
Year (down) 1995 Publication Physica: C : superconductivity Abbreviated Journal Physica C
Volume 248 Issue 3/4 Pages 317-327
Keywords A1 Journal article; Electron microscopy for materials research (EMAT)
Abstract By means of electron diffraction the 2 root 2 a(p) x 2 root 2 a(p) phase, well-known in YBa2Cu3O7-delta was observed in two other perovskite-based materials (Y0.75Ce0.25)(2)(Sr0.85Y0.15)(2)AlCU2O9 and Bi1.8Pb0.4Sr2Ca2Cu3O10+x. Highly correlated ordering is observed in the ab-plane, the correlation along the c-direction being weak. The plane group of the superstructure symmetry elements was determined on the basis of observed reflection conditions in diffraction patterns. Our results unambiguously rule out oxygen ordering as a possible origin of the superstructure. Experimental evidence points out that the superstructure is associated with the CuO2 layers, that are the only structural elements common to the three compounds studied. A model is proposed where the CuO2 sheet is displacively modulated. Experimental evidence suggests a correlation between adjacent CuO2 sheets. Comparison of simulated and experimental [001] zone diffraction patterns strongly supports our model.
Address
Corporate Author Thesis
Publisher Place of Publication Amsterdam Editor
Language Wos A1995RJ45000012 Publication Date 2003-04-07
Series Editor Series Title Abbreviated Series Title
Series Volume Series Issue Edition
ISSN 0921-4534; ISBN Additional Links UA library record; WoS full record; WoS citing articles
Impact Factor 0.942 Times cited 13 Open Access
Notes Approved no
Call Number UA @ lucian @ c:irua:13317 c:irua:13317 Serial 8
Permanent link to this record