Journal of Applied Physics · 2006 · 27 citations · 15 references
Natural SciencesMaterials SciencePhysicsCeramic MaterialsMaterials PhysicsSpectroscopyCrystal ChemistryElectronic Band StructureElectronic Structure Of SolidsFerroelectric CeramicsFerroelectric MaterialsX-ray SpectroscopyElectronic Structure AnalysisFerroelectric PropertiesFerroelectric StructureLanthanide Electronic StructureSoft X-ray SpectroscopyTitanium OxidesX-ray Absorption Near Edge StructureX-ray Absorption Spectroscopy
The electronic structure of Pb1−xLaxTiO3 (PLT) compounds for x ranging from 0to30at.% of La is investigated by means of soft x-ray absorption near edge structure (XANES) at the Ti L3,2 and O K edges. The greatest modification in the structure of the Ti 2p XANES spectra of the PLT compounds is observed in the region of the high energy peak of the L3 edge (eg states), which exhibits a splitting in the undoped sample. As the amount of lanthanum increases, this splitting becomes less pronounced. This modification is interpreted as a decrease in the degree of disorder of titanium atoms, which is correlated to the substitution of Pb by La atoms. The structural changes observed at the low energy peaks of the O K-edge XANES spectra of the PLT compounds may be interpreted in terms of hybridization between O 2p, Ti 3d, and Pb 6p orbitals. A decrease in the degree of hybridization observed as Pb atoms are replaced by La atoms may be related to the differences in the ferroelectric properties observed between x=0.0 and x=0.30 compounds.
15
Ti 2p and O 1s X-ray absorption of TiO2 polymorphs
R. Ruus, Arvo Kikas, A. Saar et al. · Solid State Communications · 1997 · 123 citations