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Room temperature Co K-edge extended x-ray absorption fine structure (EXAFS),x-ray absorption near edge structure (XANES) including pre-edge and x-raydiffraction (XRD) studies are carried out on LaCoO3 and PrCoO3. The Co-O,Co-La/Pr and Co-Co bond lengths are obtained from EXAFS analysis and comparedwith those obtained from XRD. The EXAFS analysis of data indicates that CoO6octahedron is distorted in both LaCoO3 and PrCoO3. Such distortion is expectedin orthorhombic PrCoO3 but not in rhombohedral LaCoO3. This distortion in CoO6octahedron is attributed to Jahn-Teller active Co3+ ion in intermediate spinstate in these compounds. Higher shell studies reveal that Debye-Waller (DW)factors of Co-Pr and Co-Co bonds in PrCoO3 are more in comparison to Co-La andCo-Co bonds in LaCoO3 indicating that these bonds are structurally moredisordered in PrCoO3. The comparison of Co-Co bond lengths and corresponding DWfactors indicates that the structural disorder plays an important role indeciding the insulating properties of these compounds. XANES studies have shownchanges in the intensities and positions of different near edge features.Comment: 22 pages, 8 figures, 2 tables. To appear in J. Phys.: Condens. Matte

journal of physics. condensed matter

Local distortion in LaCoO<sub>3</sub>and PrCoO<sub>3</sub>: extended x-ray absorption fine structure, x-ray diffraction and x-ray absorption near edge structure studies

Local distortion in LaCoO3and PrCoO3: extended x-ray absorption fine structure, x-ray diffraction and x-ray absorption near edge structure studies

Local distortion in LaCoO₃and PrCoO₃: extended x-ray absorption fine structure, x-ray diffraction and x-ray absorption near edge structure studies