Ni-P and its nano-CeO2 doped coating were electrolessly prepared in acidic condition,and their microstructure and anti-corrosion property were studied and compared.Scanning electronic microscopy（SEM）,transmission el...Ni-P and its nano-CeO2 doped coating were electrolessly prepared in acidic condition,and their microstructure and anti-corrosion property were studied and compared.Scanning electronic microscopy（SEM）,transmission electronic microscopy（TEM）,X-ray diffraction spectrometer（XRD）and differential scanning calorimeter（DSC）were used to examine surface morphology and microstructure of coatings.The results showed that Ni-P coating had partial amorphous structure mixed with nano-crystals,while the Ni-P/CeO2 coating had perfect amorphous structure.Upon heating,Ni3P precipitation and Ni crystallization took place in both coatings but at different temperatures of phase change.In addition,the Ni-P/CeO2 coating had sintered phase of NiCe2O4 spinels.The anti-corrosion property and passivity were improved in the CeO2-doped coating because it was less liable to undergo localized corrosion and had a slower corroding rate than its CeO2-free counterpart.During the co-deposition process,some Cen+（n=3,4）ions might be adsorbed to the metal/solution electrical double layer and hinder nickel deposition.Ni-P/CeO2 coating’s perfect amorphous structure was probably due to the hindered crystal-typed deposition of nickel and the promoted deposition of phosphorous.展开更多
The general characteristics of f-f and f-d emission spectra of lanthanide ions in insulators are discussed. The current status of energy level and intensity calculations is evaluated. Taking typical examples, the meth...The general characteristics of f-f and f-d emission spectra of lanthanide ions in insulators are discussed. The current status of energy level and intensity calculations is evaluated. Taking typical examples, the methods of synthesis of lanthanide ion-doped insulating nanomaterials are presented and their characterizations and unusual optical properties are compared.展开更多
文摘Ni-P and its nano-CeO2 doped coating were electrolessly prepared in acidic condition,and their microstructure and anti-corrosion property were studied and compared.Scanning electronic microscopy（SEM）,transmission electronic microscopy（TEM）,X-ray diffraction spectrometer（XRD）and differential scanning calorimeter（DSC）were used to examine surface morphology and microstructure of coatings.The results showed that Ni-P coating had partial amorphous structure mixed with nano-crystals,while the Ni-P/CeO2 coating had perfect amorphous structure.Upon heating,Ni3P precipitation and Ni crystallization took place in both coatings but at different temperatures of phase change.In addition,the Ni-P/CeO2 coating had sintered phase of NiCe2O4 spinels.The anti-corrosion property and passivity were improved in the CeO2-doped coating because it was less liable to undergo localized corrosion and had a slower corroding rate than its CeO2-free counterpart.During the co-deposition process,some Cen+（n=3,4）ions might be adsorbed to the metal/solution electrical double layer and hinder nickel deposition.Ni-P/CeO2 coating’s perfect amorphous structure was probably due to the hindered crystal-typed deposition of nickel and the promoted deposition of phosphorous.
文摘The general characteristics of f-f and f-d emission spectra of lanthanide ions in insulators are discussed. The current status of energy level and intensity calculations is evaluated. Taking typical examples, the methods of synthesis of lanthanide ion-doped insulating nanomaterials are presented and their characterizations and unusual optical properties are compared.
