Abstract
The new mixed oxide having composition close to Ca 7Co 3Ga 5O 18 was synthesized from CaCO 3, Co 3O 4 and Ga 2O 3 at 1150 °C in air and studied by neutron and synchrotron X-ray powder diffraction, selected-area electron diffraction and high-resolution electron microscopy. The structure was refined, using time-of-flight (TOF) neutron powder diffraction data, in space group F432, with a = 15.0487 ( 4 ) Å and Z = 8 , to R F = 0.7 % . It is considerably disordered, with four different tetrahedral sites randomly occupied by Co and Ga atoms at a ratio of 1:2. The tetrahedra form a disordered (Co 1/3Ga 2/3)O 2 3D-framework inside which isolated CoO 6 octahedra, surrounded by 8 Ca atoms, are located. The structure is related to the ordered structure of Ca 14Al 10Zn 6O 35. Electron diffraction patterns confirmed the symmetry and unit cell and revealed no diffuse scattering. High-resolution electron microscopy images showed the absence of extended structural defects.
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.
