The Yb2 O3 component was introduced into the Er^3+/Ce^3+ co-doped tellurite glasses with the composition of TeO2-WO3-Na2 O-Nb2 O5 to study the effect of Yb^3+ on the 1.53 μm spectroscopic properties of Er^3+. The X-r...The Yb2 O3 component was introduced into the Er^3+/Ce^3+ co-doped tellurite glasses with the composition of TeO2-WO3-Na2 O-Nb2 O5 to study the effect of Yb^3+ on the 1.53 μm spectroscopic properties of Er^3+. The X-ray diffraction(XRD) curve and Raman spectrum were measured to investigate the structure nature of synthesized tellurite glasses. The absorption spectrum, upconversion emission spectrum and fluorescence spectrum were measured to evaluate the improved effect of Yb^3+ concentration on the 1.53 μm band fluorescence of Er^3+. Results of the measured 1.53 μm band fluorescence intensity show a significant improvement with the increase of Yb^3+ concentration, while the total quantum efficiency reveals a similar increasing trend. The results of the present work indicate that Er^3+/Ce^3+/Yb^3+ tri-doped tellurite glass has good prospect as a promising gain medium applied for the 1.53 μm broadband amplifier.展开更多
3Gd2O3-3Yb2O3-4Y2O3 （mole fraction, %） co-doped ZrO2 （GY-YSZ） thermal barrier coatings （TBCs） were produced by electron beam physical vapor deposition （EB-PVD）. The oxidation behavior of GY-YSZ at 1 050 ℃ was...3Gd2O3-3Yb2O3-4Y2O3 （mole fraction, %） co-doped ZrO2 （GY-YSZ） thermal barrier coatings （TBCs） were produced by electron beam physical vapor deposition （EB-PVD）. The oxidation behavior of GY-YSZ at 1 050 ℃ was investigated using impedance spectroscopy （IS） combined with scanning electron microscopy （SEM）, Raman spectroscopy and X-ray diffractometry （XRD）. Various electrical responses observed in the impedance spectra corresponding to GY-YSZ grains and grain boundaries were explained using circuit modeling. The change in the conduction mechanism of GY-YSZ was found to be related to the O^2- vacancy and lattice distortion due to the stabilizer diffusion during the oxidation. The results also suggested that the specific oxidation information about the GY-YSZ grains and grain boundaries should be acquired at a moderate measurement temperature, which was related to the resistance value in the impedance spectra. The resistance values of the GY-YSZ grains and grain boundaries should be measured at 200 ℃ and 300 ℃, respectively.展开更多
(ZrO2)1-x（Yb2O3）x （x=0.07, 0.09, 0.11） nanocrystallites were hydrothermally prepared in basic media by using co-precipitated Zr（OH）4 and Yb（OH）3 as precursor. The nanocrystallites have small particle sizes of ...(ZrO2)1-x（Yb2O3）x （x=0.07, 0.09, 0.11） nanocrystallites were hydrothermally prepared in basic media by using co-precipitated Zr（OH）4 and Yb（OH）3 as precursor. The nanocrystallites have small particle sizes of 5.87.5 nm, narrow size distribution, less agglomeration and high sinterability. The oxide-ionic conduction properties of the prepared ceramics were investigated by means of AC impedance spectroscope, oxygen concentration cell at 6001 000 ℃. The results show that the ceramic with x=0.09 is superior to the ceramics with x=0.07 and 0.11 in oxide-ionic conduction.展开更多
基金supported by the National Natural Science Foundation of China(No.61875095)the State Grid Science and Technology Planning Project(No.SGZJ0000KXJS1800332)+1 种基金the Sinopec Science and Technology Project(No.317018-4)the Fundamental Research Funds for the Central Universities(No.16CX06052A)
文摘The Yb2 O3 component was introduced into the Er^3+/Ce^3+ co-doped tellurite glasses with the composition of TeO2-WO3-Na2 O-Nb2 O5 to study the effect of Yb^3+ on the 1.53 μm spectroscopic properties of Er^3+. The X-ray diffraction(XRD) curve and Raman spectrum were measured to investigate the structure nature of synthesized tellurite glasses. The absorption spectrum, upconversion emission spectrum and fluorescence spectrum were measured to evaluate the improved effect of Yb^3+ concentration on the 1.53 μm band fluorescence of Er^3+. Results of the measured 1.53 μm band fluorescence intensity show a significant improvement with the increase of Yb^3+ concentration, while the total quantum efficiency reveals a similar increasing trend. The results of the present work indicate that Er^3+/Ce^3+/Yb^3+ tri-doped tellurite glass has good prospect as a promising gain medium applied for the 1.53 μm broadband amplifier.
基金Projects (50771009, 50731001 and 51071013) supported by the National Natural Science Foundations of China Project (2010CB631200) supported by the National Basic Research Program of China
文摘3Gd2O3-3Yb2O3-4Y2O3 （mole fraction, %） co-doped ZrO2 （GY-YSZ） thermal barrier coatings （TBCs） were produced by electron beam physical vapor deposition （EB-PVD）. The oxidation behavior of GY-YSZ at 1 050 ℃ was investigated using impedance spectroscopy （IS） combined with scanning electron microscopy （SEM）, Raman spectroscopy and X-ray diffractometry （XRD）. Various electrical responses observed in the impedance spectra corresponding to GY-YSZ grains and grain boundaries were explained using circuit modeling. The change in the conduction mechanism of GY-YSZ was found to be related to the O^2- vacancy and lattice distortion due to the stabilizer diffusion during the oxidation. The results also suggested that the specific oxidation information about the GY-YSZ grains and grain boundaries should be acquired at a moderate measurement temperature, which was related to the resistance value in the impedance spectra. The resistance values of the GY-YSZ grains and grain boundaries should be measured at 200 ℃ and 300 ℃, respectively.
文摘(ZrO2)1-x（Yb2O3）x （x=0.07, 0.09, 0.11） nanocrystallites were hydrothermally prepared in basic media by using co-precipitated Zr（OH）4 and Yb（OH）3 as precursor. The nanocrystallites have small particle sizes of 5.87.5 nm, narrow size distribution, less agglomeration and high sinterability. The oxide-ionic conduction properties of the prepared ceramics were investigated by means of AC impedance spectroscope, oxygen concentration cell at 6001 000 ℃. The results show that the ceramic with x=0.09 is superior to the ceramics with x=0.07 and 0.11 in oxide-ionic conduction.
