Abstract
We synthesized YBaCo2O5+x with various oxygen contents x and investigated physical and structural properties. YBaCo2O5+x can be classified into three parts of composition region in the structural properties. Two kinds of superstructure, 2×1×1 and 3×3×1, originating in the ordering of excess oxygen in Y(O)x layer appear in the range 0.50≤x and 0.25≤x≤0.44, respectively. The 2×1×1 phase shows the metal–insulator transition accompanied with the large lattice distortion and the magnetic transition. The 3×3×1 phase (stoichiometric composition, x=0.44) also shows some magnetic and structural transitions. A plausible model of the 3×3×1 superstructure is proposed. In the range 0.00≤x≤0.19, YBaCo2O5+x has no longer superstructure. YBaCo2O5+x in x=0.00 shows successive phase transitions, a paramagnetic tetragonal to antiferromagnetic orthorhombic transition, and a charge order transition. The present study reveals a simultaneous phase separation with the charge order transition.
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.
