Correlation between O1s binding energy and metal binding energy in XPS spectra of oxide glasses

摘要

Suitable relationships between O1s and metal binding energies,electronic oxide ion polarisability,refractive index based optical basicity and Yamashita-Kurosawa's interaction prameter hae been sought on the basis of experimental and calculated data reported in the literature for Na_2O-SiO_2,PbO-SiO_2,La_2O_3-P_2O_5,Sb_2O_3-B_2O_3,Bi_2O_3-B_2O_3 and R_2O-TeO_2 (R=Li,Na and K)glasses.In general the mean O1s binding energy decreases with decreasing metal binding energy in the XPS spectra of the glasses.This is accompanied with increase in refractive index based optial basicity and decrease in interaction parameter.the observed chemical shift of both O1s and metal XPS peaks toward lower binding energy with icnreasing basicity is closely related to the interaction between valence orbitals of Me (metal)and O~(2-)ions leading to the formation of Me-O chemical bonds in the glass structure.The role of lectronic ion polarisability in chemical bonding has been estimated.The resuls obtained are in good agreement with the optical basicity concept introduced by Duffy adn Ingram.