Abstract
The substitution for Cu by Al in YBa 2(Cu 1− x Al x ) 3O 7− δ has been studied by means of high voltage electron microscopy (HVEM). The higher oxygen coordination of the impurity ions in the chain plane leads to a twin refinement for weakly doped samples ( x⩽0.03) and to the formation of microdomains at higher concentrations of the impurity. A displacement wave which provides a reduction of the strain energy of the distortion between the microdomains forms the tweed structure. The analysis of the diffraction streaks of tweed by in-situ-heating shows that the wavelength of the modulation increases if the oxygen concentration decreases.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
