Study of Mechanism of Mixed Conduction Due to Electrons and Oxygen Ions in (La0.75Sr0.25)MnO3.00 and (Ba0.5Sr0.5)(Co0.8Fe0.2)O2.33 through Rietveld Refinement and MEM Analysis

摘要: In this study, we have analyzed the mechanism of mixed conduction due to electrons and oxygen ions in (La0.75Sr0.25)MnO3.00 (LSM) (Ba0.5Sr0.5)(Co0.8Fe0.2)O2.33 (BSCF) by using Rietveld refinement technique maximum entropy method (MEM). Using neutron diffraction measurements, showed that site occupancies O1 (4c) O2 (8d) sites BSCF are 0.59 0.87, respectively. Further, MEM analysis synchrotron X-ray measurements revealed Mn-O plane LSM has a strong, isotropic covalent bond enables electrons. The (Co,Fe)-O2 with low concentration vacancies can also conduct On other hand, (Ba,Sr)-O1 BSCF, which high vacancies, large displacement parameter (Uiso) values, strong ionic bond, is responsible for diffusion ions.