The fractal property and low frequency Raman scattering of Eu(DBM)3 nanosized microcrystals were investigated. The influence of the fractal structure of Eu(DBM)3 non-crystalline solids on low frequency scattering was ...The fractal property and low frequency Raman scattering of Eu(DBM)3 nanosized microcrystals were investigated. The influence of the fractal structure of Eu(DBM)3 non-crystalline solids on low frequency scattering was studied. It was found that vibrational excitations ou the fractal are localized and can be described in terms of fraction8. It was sliown that reduced Raman scattering intensity is of a power law dependence of the vibrational frequencies for all samples.The fractal and spectraJ dimensiou were also determined, we found that our experimental value was in fair agreement with the theoretical one.展开更多
The colloids of Eu(DBM)3 and ultrafine particles Eu(DBM)3 were perpared. The particle sizes determined by X-ray and by TEM measurements were in 7-30nm range. Their UV absorption and fluorescence spectra were compared ...The colloids of Eu(DBM)3 and ultrafine particles Eu(DBM)3 were perpared. The particle sizes determined by X-ray and by TEM measurements were in 7-30nm range. Their UV absorption and fluorescence spectra were compared with each other and with those of the solid sample. It was shown that the 5D1→7 F1,2 transition was observed in the colloids of Eu(DBM)3 at room temperature. The increase of the excited-state S1 and T1 energy, the peak positions of UV absorption shifted to shorter wavelength, the changes of the absoprtion coefficient with decreasing size were observed.展开更多
This paper reports the synthesis of new reagent DBM-FsaA for a simple and rapid spectrophotometric method for the determination of trace cerium in alloy with DBM-FsaA.In the strong acid cerium with a new chromogeric r...This paper reports the synthesis of new reagent DBM-FsaA for a simple and rapid spectrophotometric method for the determination of trace cerium in alloy with DBM-FsaA.In the strong acid cerium with a new chromogeric reagent DBM-FsaA forms violet-blue stable complex which shows maximum absorption at 620 nm with a molar absorption 1.22×105 L·mol-1cm-1.Beer’s law is obeyed in the range of 0-25μg/25ml for cerium.This method has been used for the determination of trace cerium in zinc alloy with satisfactory results.展开更多
文摘The fractal property and low frequency Raman scattering of Eu(DBM)3 nanosized microcrystals were investigated. The influence of the fractal structure of Eu(DBM)3 non-crystalline solids on low frequency scattering was studied. It was found that vibrational excitations ou the fractal are localized and can be described in terms of fraction8. It was sliown that reduced Raman scattering intensity is of a power law dependence of the vibrational frequencies for all samples.The fractal and spectraJ dimensiou were also determined, we found that our experimental value was in fair agreement with the theoretical one.
文摘The colloids of Eu(DBM)3 and ultrafine particles Eu(DBM)3 were perpared. The particle sizes determined by X-ray and by TEM measurements were in 7-30nm range. Their UV absorption and fluorescence spectra were compared with each other and with those of the solid sample. It was shown that the 5D1→7 F1,2 transition was observed in the colloids of Eu(DBM)3 at room temperature. The increase of the excited-state S1 and T1 energy, the peak positions of UV absorption shifted to shorter wavelength, the changes of the absoprtion coefficient with decreasing size were observed.
文摘This paper reports the synthesis of new reagent DBM-FsaA for a simple and rapid spectrophotometric method for the determination of trace cerium in alloy with DBM-FsaA.In the strong acid cerium with a new chromogeric reagent DBM-FsaA forms violet-blue stable complex which shows maximum absorption at 620 nm with a molar absorption 1.22×105 L·mol-1cm-1.Beer’s law is obeyed in the range of 0-25μg/25ml for cerium.This method has been used for the determination of trace cerium in zinc alloy with satisfactory results.
