Chemical shifts of atomic core levels and structure of K1−xTi1−xSbxOPO4, x=0–0.23, solid solutions

Antimony-doped K1−xTi1−xSbxOPO4, image, crystals have been prepared by spontaneous nucleation from the flux in the quaternary system K2O–TiO2–P2O5–Sb2O5. Crystal structure observation with TEM method reveals the presence of superstructure ordering. Core level electronic parameters have been studied by X-ray photoelectron spectroscopy. Strong effect of Sb doping has been detected for inner shells of Ti4+ ions. Prominent decreasing of the binding energy difference Δ(O 1s–Ti 2p3/2) correlates with the shortening of mean oxide bond length L(Ti−O) at image that suggests increased ionicity of Ti−O bonds in K1−xTi1−xSbxOPO4 solid solutions.