80 resultados para LIF
em Chinese Academy of Sciences Institutional Repositories Grid Portal
Resumo:
通过显微镜聚焦近红外超快强激光作用在垂直于激光束移动的LiF晶体样品上,在LiF晶体中连续地诱导产生色心。以一定的间隔.反复移动该激光束的焦斑可在LiF晶体内空间选择性地诱导产生稳定的色心区。测定了不同条件下形成的色心区的吸收光谱,结果表明用近红外超快强激光可在LiF晶体中诱导产生具有激光效应的色心。
Resumo:
We report the observation of intense spontaneous emission of green light from LiF:F-2:F-3(+) centers in active channel waveguides generated in lithium fluoride crystals by near-infrared femtosecond laser radiation. While irradiating the crystal at room temperature with 405 nm light from a laser diode, yellow and green emission was seen by the naked eye. Stripe waveguides were fabricated by translating the crystal along the irradiated laser pulse, and their guiding properties and fluorescence spectra at 540 nm demonstrated. This single-step process inducing a waveguide structure offers a good prospect for the development of a waveguide laser in bulk LiF crystals.
Resumo:
The organic light-emitting device (OLED) with simple structures of indium tin oxide (ITO)/tris(8-quinolinolato) aluminum (Alq(3))/LiF/Al and ITO/Alq(3)/Al was fabricated to analyze the contribution of LiF in OLED. We used the C-V characteristics to investigate the contribution of LiF in OLED and found that the capacitance of the above-mentioned structures was 12.5 nF and 77.5 nF, respectively. It is shown that the LiF layer affects the property of OLED resulting in the change of the capacitance of the device.
Resumo:
MonteCarlo法计算机模拟研究DyF_3-BaF_2-LiF三元系熔体,得到了离子间偏径向分布函数、局部结构和能量分布等信息.研究表明:F~-聚集在Dy~(3+)周围,主要组成以DyF_6~(3-)形式的八面体络离子;Li~+以“游离”状态存在,其平均位能较高,在电解中起到迁移电流的作用:氟离子可分为“端氟”、“游氟”和“桥氟”三类,不同行为的氟其位能也不同、通过“桥氟”组成诸如Fm-Dy-F-Dy-Fn或Fm-Dy Dy-Fn较复杂的离子集团;与DyF_3-LiF二元系熔体模拟结果相比较,BaF_2的加入使DyF_6~(3-)形式的八面体络离子较为紧密及有序.
Resumo:
用MonteCarlo法计算机模拟研究DyF_3-LiF系熔体,得到了径向分布函数和局部结构等信息。研究表明,F紧密聚集在Dy ̄(3+)周围,而与Li之间却存在一定的缝隙。该熔体中主要存在着二种离子类型:以Dy ̄(3+)为中心的DyF型络离子(以DyF的八面体络离子为主)和“游离状”的Li离子。同时,由于F的聚集,一些DyF型络离子通过“氟桥”组成Dym型更加复杂的离子集团。各类离子位能计算表明:Li是该熔体中位能最高的离子,在电解过程中起到迁移电流的作用.
Resumo:
用最大气泡压力法,采用三因子一次回归正交设计,研究了Na_3AlF_6-LiF-RE_2O_3体系的表面张力,得出表面张力(Y)与RE_2O_3含量(c_1)、LiF含量(c_2)及溶体温度(t)的回归方程如下:Y=260.78+4.088c_1+0.073c_2+0.557c_1c_2-0.136t-0.00483c_1t-0.00050c_2t。
Resumo:
熔盐是固体盐类的高温熔体,与其他液体一样,具有近程有序和远程无序的特性。对于其结构的研究和表征要比完全有序的晶体和完全无序的气体困难得多。传统的熔盐结构理论多以伪晶格模型为基础,虽能解释熔盐的某些规律,但与熔盐结构的真实情况相差甚远。较为严格的理论是分布函数理论。与格子理论不同,它不以任何物理模型为依据,而是从解决粒了间相互作用势出发的统计力学理论,该方法的特点是以求出径向分布函数去解整个体系的构型积分,然后求出其全部热力学量。但由于通过建立有关积分方程式(如
Resumo:
目前多采用径向分布函数来描述熔盐的结构,虽然这种一维统计描述给出的信息有限,但它是迄今为止较为成熟的一种方法。实验上获得熔体的径向分布函数主要通过衍射法。在国际上日本等国家的研究人员对纯熔盐的衍射结构分析已经进行了多年的研究,由于混合熔盐的结构比较复杂,所以近些年才有关于混合熔盐X-射线衍射结构分析的报道,但只限于相同阳离子或相同阴离子的体系,对于LiF-KCl体系至今未见报道。
Resumo:
本文利用X射线散射技术测定和Monte Carlo计算机模拟计算,获得了LiF-KCl熔体的径向分布函数。实验发现,在互易系LiF-KCl熔体中,小离子Li~+与F~-更易形成结合较为紧密的集团,而大离子K~+与Cl~-的结合相对较为松地,即出现“大大小小”效应。
Resumo:
In order to avoid the hygroscopicity of LiCl specimem, the method of directly chlorinating Li_2CO_3 with NH_4Cl was successfully introducing into the thermal analysis of the system containing LiCl. The three fusibility diagram of LiCl-KCl, LiClNaCl, LiCl-LiF were determined using the method. The results are in agreement wish the values reported in the literature, and phase diagram of LiCl-KCl-LiF ternary system was constructed based on these results. Temperature of the ternary eutectic, composed of 57.3mol%...
Resumo:
首次成功地将NH_4Cl直接氯化Li_2CO_3的反应引入热分析,制作含LiCl的二元、三元体系溶盐相图,避免LiCl吸水性给相图绘制带来的困难,三个二元体系LiCl-KCl、NaCl-LiCl和LiCI-LiF的测定结果与文献吻合很好.并在此基础上制作了LiCl-KCl-LiF三元相图。