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91.
The crystal structure of annealed β-In2S3 thin films with different thickness was investigated by X-ray diffraction technique. Lattice parameters, crystallite size and microstrain were calculated. It was found that the lattice parameters are independent on film thickness, while annealing temperatures increase them. Crystallite sizes were increased with the increase of the film thickness and improved by annealing temperatures. In all cases, the microstrains were decreased gradually with the increase in both film thickness and annealing temperatures. Optical properties of β-In2S3 thin films were performed in the spectral range from 400 to 2500 nm to determine the optical constants (n and k), the high frequency dielectric constant, ε∞, the lattice dielectric constant, εL, and the energy gap. The optical constants were found to be independent on film thickness in the range from 200 to 630 nm. The high frequency dielectric and lattice dielectric constants of the as-deposited film increased by annealing temperatures. The energy gap for the as-deposited In2S3 was found to be 2.60 eV and increased to 2.70 and 2.75 eV by annealing at 423 and 473 K for 1 h, respectively. 相似文献
92.
Hexamethyldisiloxane polymer layers obtained at low frequency glow discharge were post-treated by ammonia vapours under the same plasma conditions. Infrared spectroscopic ellipsometry and atomic force microscopy studies were carried out with the aim to elucidate the structural and morphological changes accompanying this modification. The infrared ellipsometry combined with best-fit calculations was used to evaluate the optical constants of the polymer film before and after the treatment, and thus to provide data for the vibrational band analysis. No additional modified layer due to the plasma treatment was detected, but a newly emerged weak band at 1562 cm−1 was observed in the ellipsometric spectra of the ammonia-treated sample, which was ascribed to N-H deformation in amines.The surface morphology was imaged by atomic force microscopy. The data revealed that the NH3 treatment had caused distinct micro-structural modification on the top layer surface. The size of the nodule aggregates was largely reduced and this contributed to a much better developed top surface. 相似文献
93.
A.F. Qasrawi 《Thin solid films》2008,516(6):1116-1119
AgIn5S8 thin films were obtained by the thermal evaporation of AgIn5S8 crystals onto ultrasonically cleaned glass substrates. The films are found to exhibit polycrystalline cubic structure. The calculated lattice parameter of the unit cell (a) is 10.78 Å. The transmittance data of the as grown films which was recorded at 300 K in the incidence wavelength (λ) range of 320-1000 nm are used to calculate the refractive, n(λ). The transmittance and reflectance data are also used to calculate the absorption coefficient of the as grown AgIn5S8 thin films. The fundamental absorption edge is found to be corresponding to a direct allowed transitions energy band gap. This band-to-band transition energy is found to be 1.78 eV and it is consistent with that reported for AgIn5S8 single crystals. 相似文献
94.
Reactive pulsed magnetron sputtering was used to produce conductive and transparent tin-doped indium oxide (ITO) films with low thickness inhomogeneity. Due to the parallel operation of two magnetrons, the deposition system allows in situ investigations of the plasma influence on the film properties. The distribution of the film resistivity, refractive index, structure and stoichiometry along the substrate are presented and related to the spatial distribution of the plasma flow escaping the magnetrons, and the substrate temperature. A higher plasma flow likely causes a localized relaxation of the distorted In-O bonds in amorphous phase which prevails in ITO films prepared at unheated substrates. This leads to a decrease of the film resistivity due to free electrons density and mobility enhancement. The free electron density increase is caused likely by generation of oxygen vacancies. Deposition on a heated substrate (Ts / Tm = 0.3) leads to a change of the film growth mode due to enhanced surface diffusion of the adatoms which results in a textured low resistivity film. This also causes significant improvements of the homogeneity of the film properties that is important for ITO applications. 相似文献
95.
毛燕敏 《宁波工程学院学报》2001,13(3):67-69,72
温庭筠词中有大量的景物描写,对这些景物描写的功能,人们常常认识不足。实际上,温庭筠描写景物的目的并不单单为了“炫人眼目”,而是为表现词作主人公的内心情感服务的,其功能表现为三种形态:一是景与情融,起的是借景传情的作用;二是景与情同,起的是渲染作用;三是景与情反,起的是的衬作用。无论何者,都服务于词作主人公情感的传达和心理的揭示,绝不应受到“浪费丽字”的诟病。 相似文献
96.
Haiyan Zhang Tingyu Liu Qiren Zhang Xi’en Wang Xiaofeng Guo Min Song Jigang Yin 《Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms》2009,267(7):1056-1060
The electronic structures, dielectric function and absorption spectra for the perfect BaWO4 (BWO) crystal and the BWO crystal containing barium vacancy () have been studied using density functional theory code CASTEP with the lattice structure optimized. The results indicate that the optical properties of the BWO crystal exhibit anisotropy and its optical symmetry coincide with lattice structure geometry of the BWO crystal. For the BWO crystal containing , there exhibit four absorption bands peaking at 0.71 eV (1751 nm), 1.85 eV (672 nm), 3.43 eV (362 nm) and 3.85 eV (322 nm), respectively. The origins of the 370 nm absorption band should be related to the . 相似文献
97.
The large-scale cryogenic gravitational wave telescope (LCGT) requires ultra-high vacuum tubes which the laser beams pass through. Two 3-km vacuum tubes are kept in ∼10−7 Pa of vacuum pressure so as to reduce scattering-effects due to residual gas molecules. The stainless-steel material with electro-chemical buffing is the most available for use as long tubes of 1 m in diameter. To reduce noises due to scattered light from the surface of tubes, a lot of baffles are inserted into the tubes. 相似文献
98.
99.
刘影 《湖南工业职业技术学院学报》2005,5(1):72-75
地域化因素是影响学创作的重要外部因素,是无数人创作灵感的源泉.宋代地域化在中国化史具有突出的特色,对宋词创作产生了多层面的影响,其主要表现为:地域化对宋词繁荣起了推动作用;东南地区地域化的迅速发展,使得词人创作队伍集聚于江西、江苏、浙江等地;地域化从自然地理环境与人地理环境两个方面对词人创作风格产生重大影响;不同的地域化会促使同一词人创作风格的转变. 相似文献
100.