ELECTRONIC AND STRUCTURAL PARAMETERS OF PHOSPHORUS–OXYGEN BONDS IN INORGANIC PHOSPHATE CRYSTALS

Abstract

Wide set of experimental results on binding energy of photoelectrons emitted from P 2 p , P 2 s , and O 1 s core levels has been observed for inorganic phosphate crystals and the parameters were compared using energy differences Δ( O 1 s - P 2 p ) and Δ ( O 1 s - P 2 s ) as most robust characteristics. Linear dependence of the binding energy difference on mean chemical bond length L( P – O ) between phosphorus and oxygen atoms has been found. The functions are of the forms: Δ ( O 1 s - P 2 p ) ( eV ) = 375.54 + 0.146 · L( P – O ) ( pm ) and Δ ( O 1 s - P 2 s ) ( eV ) = 320.77 + 0.129 · L( P – O ) ( 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.