Open AccessXANES study on Ruddlesden‐Popper phase, La n+1 Ni n O 3n+1 (n = 1, 2, and ∞)
Author(s) -
Park JungChul,
Kim DongKuk,
Byeon SongHo,
Kim Don
Publication year - 2001
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s0909049500015983
Subject(s) - xanes , antibonding molecular orbital , electrical resistivity and conductivity , crystallography , rietveld refinement , analytical chemistry (journal) , bond length , spectral line , materials science , phase (matter) , chemistry , atomic orbital , physics , crystal structure , electron , organic chemistry , chromatography , quantum mechanics , astronomy
Ruddlesden‐Popper phase, La n+1 Ni n O 3n+1 (n = 1, 2 and ∞) compounds were prepared by citrate sol‐gel method. We revealed the origin of the variation of the electrical conductivities in La n+1 Ni n O 3n+1 (n = 1, 2 and ∞) using resistivity measurements, Rietveld analysis, and X‐ray absorption spectroscopy. According to the XANES spectra, it is found that the degree of 4p π ‐ 4p σ energy splitting between 8345 eV and 8350 eV is qualitatively proportional to the elongation of the out‐of‐plane Ni‐O bond length. With the decrease of 4p π ‐ 4p σ splitting, the strong hybridization of the σ‐bonding between Ni‐3d and O‐2p orbitals creates narrow antibonding σ* bands, which finally results in the lower electrical resistivity.