Vinay Kumari
,
Vinod Kumar
,
Devendra Mohan
,
Purnima
,
B.P. Malik
,
R.M. Mehra
材料科学技术（英文）
Variation of nonlinear optical properties with surface roughness of ZnO thin films deposited on corning glass substrates at different annealing temperature (TA) was reported. The films were characterized by X-ray diffraction (XRD), UV-Vis-NIR transmission and single beam z-scan technique using second harmonics of Nd:YAG laser. Surface morphology of the samples was investigated by atomic force microscopy (AFM). Surface roughness was found minimum (8.4 nm) for ZnO sample annealed at 450 °C. The nonlinear optical properties (NLO) were found to be dependent on surface roughness and the highest value of third order nonlinear susceptibility (χ3)=4.3×10-7 esu) was obtained for ZnO at TA 450 °C.
关键词:
ZnO films
,
null
,
null
,
null
,
null
,
null
Solid State Communications
Samples with composition R2Fe14M3 (M = Ga and Si; R = Y, Nd, Sm, Gd, Tb, Dy, Ho, Er and Tm) have been prepared by are-melting. Crystal-structure studies have shown that the prepared samples are single phase with the rhombohedral Th2Zn17 and/or the hexagonal Th2Ni17 structure. Substitution of Ga for Fe in R2Fe17 leads to an increase of the unit-cell volume, whereas Si substitution reduces the unit-cell volume. The Curie temperatures of the R2Fe14Ga3 and R2Fe14Si3 compounds are much larger than those of the corresponding R2Fe17 compounds. The Fe moment decreases upon Ga or Si substitution. The compounds R2Fe14Ga3 and R2Fe14Si3 With R = Er and Tm exhibit a spin-reorientation transition at low temperature. (C) 1997 Elsevier Science Ltd.
关键词:
neutron-diffraction;solid-solutions;substitution;anisotropy;nd2fe17
胡海江
,
周明星
,
张益
,
王敏
,
徐光
材料与冶金学报
在Gleeble-1500热模拟机上利用热膨胀法测定了12Cr2Mo1R压力容器钢的动态连续冷却转变(CCT)曲线,观察和分析了不同冷却速度下的相变和组织,绘制了实验钢种的动态CCT曲线.实验结果表明,奥氏体变形后,铁素体和珠光体转变区向左上方移动,贝氏体转变温度降低,马氏体转变开始温度降低.
关键词:
压力容器钢
,
动态CCT曲线
,
热膨胀法
,
相变
Communications in Theoretical Physics
The unified theoretical calculation of thermal shifts (TS) of R-1 and R-2 lines and thermal broadenings (TB) of R, R' and B lines for ruby was carried out for the first time. The calculated results are in very good agreement with a great number of experimental data. Especially by using quantum theory and taking into account all the admixtures of wavefunctions within d(3) electronic configuration, all the Gamma M in electron-phonon interaction (EPI), the electronic energy spectrum and lattice-vibration Spectrum, the very important contributions to TS and TB from single-phonon direct process were theoretically calculated in detail. The microscopic essentials of various contributions are revealed, and the mistakes in previous work are remedied.
关键词:
diamond anvil cell;pressure measurement;spectroscopy;temperatures
