|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Optical and luminescence characteristics of Eu^(3+)-doped B_2O_3:SiO_2:Y_2O_3:CaO glasses for visible red laser and scintillation material applications显示文摘Europium(Eu^(3+)) doped glasses of chemical compositions(55-x)B_2O_3:10 SiO_2:25 Y_2O_3:10CaO:xEu_2O_3,where x denotes mol% and ranges 0≤ x ≤ 2.5, were synthesized by adopting conventional melt quenching technique, Physical properties like density, molar volume, polaron radius, inter-ionic distance and field strength of the glass samples were investigated to assess the impact of Eu_2O_3. Optical and luminescence properties of the glasses were characterized with optical absorption, photoluminescence,X-ray induced emission spectra, temperature dependence emission spectra and decay times. Judd-Ofelt(JO) intensity parameters(Ω_λ) of the glasses were evaluated based on the absorption spectrum of 0.5 mol%. JO parameters, calculated from absorption spectra with thermal corrections on oscillator strength, were used to evaluate radiative properties such as radiative transition probability(A_R),branching ratio(β_R), stimulated cross section emission(σ) and radiative lifetime(τ_R) for ~5D_0→~7 F_J(J = 0,1,2,3 and 4) transitions. The decay rate of ~5D_0 fluorescent level for all the glass samples was single exponential. Lifetimes of the ~5D_0 level were decreased with increasing concentrations of Eu^(3+)ions from 0.05 mol% to 2.5 mol% which might be due to energy transfer through cross-relaxation in the glasses. The chromaticity coordinates(x, y) were similar for all BSYCaEu glasses and were located at the red region of CIE 1931 color chromaticity diagram. Hence, these results confirm that the Eu^(3+) doped BSYCaEu glasses could be useful for visible red lasers and glass scintillation applications. | Pabitra Aryal C.R.Kesavulu H.J.Kim S.W.Lee Sang Jun Kang J.Kaewkhao N.Chanthima B.Damdee | 2018 | Journal of Rare Earths2018，36，5： | 2 |
| 2 | Effects of the sliding conditions on the tribological behavior of atmospheric plasma sprayed Al2O3-15wt% ZrO2-CaF2 composite coating显示文摘 | S.H.Kim S.P.Hannula S.W.Lee | | 0，，： | 1 |
| 3 | Microstructure and tribological properties of pulsed electric current sintered alumina-zirconia nanocomposites with different solid lubricants显示文摘 | M.E.Cura S.H.Kim T.Muukkonen S.Varjus A.Vaajoki O.S?derberg T.Suhonen U.Kanerva S.W.Lee and S.P.Hannula | | 0，，2： | 1 |
| 4 | Effects of different solid lubricants on mechanical and tribological properties of Al2O3/ZrO2 nanocomposites显示文摘 | S.H.Kim S.H.Cho S.P.Hannula S.W.Lee | | 0，，： | 1 |
| 5 | Structure,mechanical and sliding wear properties of WC-Co/MoS2-Ni coatings by detonation gun spray显示文摘 | H.Du C.Sun W.G.Hua T.G.Wang J.Gong X.Jiang and S.W.Lee | | 0，，： | 1 |
| 6 | Relationship between microstructure and tri-bological properties for Al2O3/SiC nanocomposites显示文摘 | S.H.Kim S.W.Lee T.Sekino T.Kusunose T.Nakayama and K.Niihara | | 0，，1305： | 1 |
| 7 | 查看详情显示文摘 | J.Choi J.S.Kim I.Hwang S.Hong I.S.Byun S.W.Lee S.O.Kang and B.H.Park | | 0，，26： | 1 |
| 8 | Superplasticity of fine-grained Mg-10Li alloy prepared by severe plastic deformation and understanding its deformation mechanisms显示文摘The superplastic behavior and associated deformation mechanisms of a fine-grained Mg-10.1 Li-0.8Al-0.6Zn alloy(LAZ1011)with a grain size of 3.2μm,primarily composed of the BCCβphase and a small amount of the HCPαphase,were examined in a temperature range of 473 K to 623 K.The microstructural refinement of this alloy was achieved by employing high-ratio differential speed rolling.The best superplasticity was achieved at 523 K and at strain rates of 10^(-4)-5×10^(-4)s^(-1),where tensile elongations of 550±600%were obtained.During the heating and holding stage of the tensile samples prior to tensile loading,a significant increase in grain size was observed at temperatures above 573 K.Therefore,it was important to consider this effect when analyzing and understanding the superplastic deformation behavior and mechanisms.In the investigated strain rate range,the superplastic flow at low strain rates was governed by lattice diffusion-controlled grain boundary sliding,while at high strain rates,lattice diffusion-controlled dislocation climb creep was the rate-controlling deformation mechanism.It was concluded that solute drag creep is unlikely to occur.During the late stages of deformation at 523 K,it was observed that grain boundary sliding led to the agglomeration of theαphase,resulting in significant strain hardening.Deformation mechanism maps were constructed forβ-Mg-Li alloys in the form of 2D and 3D formats as a function of strain rate,stress,temperature,and grain size,using the constitutive equations for various deformation mechanisms derived based on the data of the current tests. | H.T.Jeong S.W.Lee W.J.Kim | 2024 | Journal of Magnesium and Alloys2024，12，1： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员