The in situ observation of crystallization behavior of metallic glass Co_(65.1) Fe_(4.7)Ni_(4.6)Si_(10.2) B_(15.4)during heat-ing in an electron microscope is carried out. The three crystalline phases correlated with...The in situ observation of crystallization behavior of metallic glass Co_(65.1) Fe_(4.7)Ni_(4.6)Si_(10.2) B_(15.4)during heat-ing in an electron microscope is carried out. The three crystalline phases correlated with the exothermalpeaks on the DSC profiles are identified by means of electron diffraction. and they are all stable phasesfrom room temperature to 1000 K.Besides.an anomalous crystalline phase with long spikes along the direction in the reciprocal lattice space is found during crystallization. and its structural model is also discussed.展开更多
The structural and optical properties of semiconductor microcrystals embedded in glassy thin films have prompted considerable interest in the fields of solid state physics and materials science. They are currently sub...The structural and optical properties of semiconductor microcrystals embedded in glassy thin films have prompted considerable interest in the fields of solid state physics and materials science. They are currently subjects of intensive research for both fundamental and practical reasons. Since the semiconductor-embedded glassy films show distinctive optical properties, many studies have been carried out to evaluate the usefulness of this type展开更多
A systematical study of the structural relaxation and crystallization processes of metallic glasses is very important in understanding the thermal stability of these mate-
Nonlinear optical absorption and nonlinear refraction were studied in ultrafine GaAs particles embedded in SiO2 thin films by use of the single-beam Z-scan technique at room temperature. An enhanced third-order nonlin...Nonlinear optical absorption and nonlinear refraction were studied in ultrafine GaAs particles embedded in SiO2 thin films by use of the single-beam Z-scan technique at room temperature. An enhanced third-order nonlinear absorption coefficient and nonlinear refractive index were measured to be about 10-1 cm/W and 10-3 esu, respectively. The saturated optical absorption and two-photon absorption, under a 104 W/cm2 irradiation intensity, were observed and discussed. Results show that the enhanced nonlinear effect mainly depends on the quantum confinement effect. Under the strong quantum confinement condition, the Coulomb interaction effect is negligible with respect to the quantum confinement effect, and the feature of nonlinear optical effect of the GaAs particles behaves as a two-level system.展开更多
文摘The in situ observation of crystallization behavior of metallic glass Co_(65.1) Fe_(4.7)Ni_(4.6)Si_(10.2) B_(15.4)during heat-ing in an electron microscope is carried out. The three crystalline phases correlated with the exothermalpeaks on the DSC profiles are identified by means of electron diffraction. and they are all stable phasesfrom room temperature to 1000 K.Besides.an anomalous crystalline phase with long spikes along the direction in the reciprocal lattice space is found during crystallization. and its structural model is also discussed.
基金Project supported by the National Natural Science Foundation of China
文摘The structural and optical properties of semiconductor microcrystals embedded in glassy thin films have prompted considerable interest in the fields of solid state physics and materials science. They are currently subjects of intensive research for both fundamental and practical reasons. Since the semiconductor-embedded glassy films show distinctive optical properties, many studies have been carried out to evaluate the usefulness of this type
文摘A systematical study of the structural relaxation and crystallization processes of metallic glasses is very important in understanding the thermal stability of these mate-
基金National Natural Science Foundation of ChinaCentre of Structure Analysis,University of Science and Technology of China.
文摘Nonlinear optical absorption and nonlinear refraction were studied in ultrafine GaAs particles embedded in SiO2 thin films by use of the single-beam Z-scan technique at room temperature. An enhanced third-order nonlinear absorption coefficient and nonlinear refractive index were measured to be about 10-1 cm/W and 10-3 esu, respectively. The saturated optical absorption and two-photon absorption, under a 104 W/cm2 irradiation intensity, were observed and discussed. Results show that the enhanced nonlinear effect mainly depends on the quantum confinement effect. Under the strong quantum confinement condition, the Coulomb interaction effect is negligible with respect to the quantum confinement effect, and the feature of nonlinear optical effect of the GaAs particles behaves as a two-level system.
