ELECTRONIC AND STRUCTURAL PARAMETERS OF PHOSPHORUSâOXYGEN BONDS IN INORGANIC PHOSPHATE CRYSTALS
V. V. ATUCHIN
V. G. KESLER
N. V. PERVUKHINA
Wide set of experimental results on binding energy of photoelectrons emitted from P 2p, P 2s, and O 1s core levels has been observed for inorganic phosphate crystals and the parameters were compared using energy differences Î(O 1s - P 2p) and Î (O 1s - P 2s) as most robust characteristics. Linear dependence of the binding energy difference on mean chemical bond length L(PâO) between phosphorus and oxygen atoms has been found. The functions are of the forms: Î (O 1s - P 2p) (eV) = 375.54 + 0.146 Â· L(PâO) (pm) and Î (O 1s - P 2s) (eV) = 320.77 + 0.129 Â· L(PâO) (pm). The dependencies are general for inorganic phosphates and may be used in quantitative component analysis of X-ray photoemission spectra of complex oxide compounds including functional groups with different coordination of P and O atoms.
Phosphate, XPS, crystal structure, chemical bonding
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