Japanese Journal of Applied Physics · 1991 · 20 citations · 23 references
Natural SciencesChemistryMaterials ScienceInorganic ChemistryMaterials ChemistrySpectroscopyChemical Vapor DepositionCoordination ChemistryMetal-ligand BondingPhotochemistrySuperconducting MaterialsTransition Metal ChemistryCuprate SuperconductorsElectronic Spectra Of Transition Metal ComplexesMetal-oxygen BondingMetalorganic Chemical Vapor DepositionSpectroscopic Characterization Of Metal-ligand BondsSpectroscopy Of Transition Metal ComplexesStability EnhancementYttrium Barium Copper Oxide Films
Ultraviolet-irradiation effects at 3∼8 eV (400∼150 nm) have been studied for Y(DPM) 3 , Ba(DPM) 2 and Cu (DPM) 2 (DPM: dipivaloylmethane) metalorganic chelates which are commonly used for YBa 2 Cu 3 O 7- x superconducting-film formation by metalorganic chemical vapor deposition (MOCVD). An IR spectral analysis shows that the chelate ring of Ba(DPM) 2 is most sensitively affected when irradiated in a 200∼300 nm region through a π-π * transition of the ligand orbital, and Y(DPM) 3 shows a similar, but much more modest reaction. On the contrary, Cu(DPM) 2 is very stable for all the light sources used. Such a difference of stability is deeply related to the metal-oxygen bonding nature of these chelates.
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