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【期刊论文】Nanocable-Aligned ZnS Tetrapod Nanocrystals
薛冬峰, Ying-Chun Zhu, *, † Yoshio Bando, † Dong-Feng Xue, ‡ and Dmitri Golberg†
J. AM. CHEM. SOC. 2003, 125, 16196~16197,-0001,():
-1年11月30日
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【期刊论文】Chemical Bond Analysis of Nonlinearity of Urea Crystal
薛冬峰, Dongfeng Xue and Siyuan Zhang*
J. Phys. Chem. A 1997, 101, 5547~5550,-0001,():
-1年11月30日
A novel and quantitative study on structure-property relationships has been carried out in urea crystal, based on the dielectric theory of complex crystals and the modified Levine bond charge model, mainly from the chemical bond viewpoint. For the first time, it was treated like this, and the bond parameters and linear and nonlinear characteristics of constituent chemical bonds were presented quantitatively. The theoretical result agrees satisfactorily with the experimental datum and can reasonably explain the nonlinear origin of urea crystal, that is, the C-N bond in the conjugated system of bonds OWCrN-H. At the same time, the novel method should be a useful tool toward the future development of the search for new nonlinear optical (NLO) materials in the organic crystal field.
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【期刊论文】Chemical bond analysis of the crystal growth of KDP and ADP
薛冬峰, Dongli Xu, Dongfeng Xue*
Journal of Crystal Growth 286(2006)108~113,-0001,():
-1年11月30日
The bond valence model is employed to calculate the bond strength of constituent chemical bonds formed between growth units in both potassium dihydrogen phosphate (KDP) and ammonium dihydrogen phosphate (ADP) crystals, with the aim to predict and control the crystal shape. After calculating and comparing the relative growth rates of all selected planes, which are related to the crystallographic structure and chemical bond strength, the natural morphology of both KDP and ADP can be conveniently deduced. To check the calculated results, the crystallites of KDP and ADP are grown under different growth conditions; their morphologies accord well with our theoretical calculations. Meanwhile, the influence of ethanol anti-solvent on crystal morphology is microscopically interpreted, which alters the crystal morphology by changing the supersaturation of the growing solution and influencing the bonding process. When ethanol is added into the growing solution, the crystal shape becomes slender.
A1., Crystal morphology, A1., Crystal structure, A1., Crystallites, A1., X-ray diffraction, B1., Phosphates, B2., Nonlinear optic materials
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【期刊论文】The origin of nonlinearity in KTiOPO4
薛冬峰, Dongfeng Xue and Siyuan Zhanga)
Appl. Phys. Lett., Vol. 70, No. 8, 24 February 1997 943~945,-0001,():
-1年11月30日
The origin of nonlinearity in KTiOPO4 was investigated quantitatively from the chemical bond viewpoint. All constituent chemical bonds in this crystal were considered and their contributions to the total linearity and nonlinearity were quantitatively determined. Calculated results agree satisfactorily with experimental data in both signs and numerical values. These results show us that TiO6 groups and P(1)O4 groups have relatively larger linear contributions and the nonlinearity derives from KOx (x58,9) groups and P~2!O4 groups.
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【期刊论文】Spontaneous growth and luminescence of zinc sulfide nanobelts
薛冬峰, Ying-Chun Zhu, a) Yoshio Bando, and Dong-Feng Xue
Appl. Phys. Lett., Vol. 82, No. 11, 17 March 2003 1769~1771,-0001,():
-1年11月30日
ZnS nanobelts have been synthesized by a simple thermal evaporation method in a N2 atmosphere containing a small amount of CO and H2 gases. The synthesized ZnS nanobelts have a width in the range of 40 to 120 nm, a thickness of 20 nm, and a length of several micrometers. The nanobelts are single crystals with a hexagonal wurtzite structure growing along the [001] direction. A vapor–solid process is proposed for the formation of such nanobelts. The as-prepared nanobelts shows two emission bands, around 450 and 600 nm.
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