【作者】 王芬；

【导师】 顾洪恩；

【作者基本信息】 天津大学 ， 材料物理与化学， 2008， 硕士

【摘要】 利用电注入着色技术,对掺氢氧根氯化钾多晶进行电注入着色,在着色多晶中产生多种色心。对着色多晶进行系统光谱测量和分析,提出色心产生和转化机理。借助测得的电流～时间曲线,对色心产生过程和机理进行更进一步解释。在未经电注入的掺氢氧根氯化钾多晶吸收光谱曲线上,观测到氢氧根离子吸收谱位置。经研究发现,在制备掺氢氧根氯化钾多晶过程中,掺入的氢氧根离子可部分转化成U色心。受碱离子扰动的U色心形成UA色心。在吸收光谱上观测到U与UA色心迭加带。在电注入过程中,O2-与结合形成偶极子。在电注入后掺氢氧根氯化钾多晶的K– M函数曲线上,观测到了偶极子光谱带。用点阴极电注入掺氢氧根氯化钾多晶,在多晶中产生了大量V2、V3、O 2 ? ? Va+、Cu+、I-2和F等色心。传统的电注入方法要求第二碱阴极的形成,晶体才能被成功着色。然而,在掺氢氧根氯化钾多晶中,掺入的氢氧根离子阻碍了第二碱阴极产生。正是本室实验装置中独特的石墨颗粒阳极阵列,使得V色心首先在阳极附近多晶内产生。V色心吸收光子转化为F色心。在进行电注入时,记录电流和时间数据,并据此绘制出电流～时间关系曲线。经分析后推知,各区域电流皆由离子运动和卤离子与阳极阵列交换电子构成。给出电流～时间曲线上电流区域形成机理和色心产生与电流区域形成的密切关系。通过多次实验总结得出,在电注入温度450 oC、电压DC 900 V和时间90min条件下对掺氢氧根氯化钾多晶进行电注入,其着色效果最好。用点阳极电注入掺氢氧根氯化钾多晶,在多晶中产生大量V、Cu+、和等色心。对经点阳极电注入掺氢氧根氯化钾多晶着色机理提出解释,并根据电流～时间曲线,对着色掺氢氧根氯化钾多晶中色心产生机理给出更进一步解释。更多还原

【Abstract】 Hydroxyl-doped potassium chloride polycrystals were successfully colored electrolytically for the first time using a technique of electrolytic coloration, varied kinds of color centers were produced in the colored polycrystals. Systematical spectral measurement and analysis were carried out to the colored polycrystals. By means of measured current ~ time curves, the process and mechanism of the production of the color centers were explained further.Positions of absorption spectrum bands of OH- ions were observed in the absorption spectra of uncolored hydroxyl-doped potassium chloride polycrystals. In research, it was found that the doped OH- ions could be converted partially into U and UA color centers during preparation of polycrystals, the corresponding spectral bands were observed in the absorption spectra. In process of electrolysis, color centers were formed by the combination of OO2 ? ? Va+2- and color centers, the corresponding spectral bands were observed in K– M functions of colored hydroxyl-doped potassium chloride polycrystals. +VaA lot of V2, V3, O 2 ? ? Va+, Cu+, I-2 and F color centers were produced in hydroxyl-doped potassium chloride polycrystal after the electrolytic coloration with a pointed cathode. Because the hydroxyl-doped potassium chloride polycrystals contain a lot of OH- ions, the polycrystals cannot be colored electrolytically using the traditional electrolysis method. It is the unique anode matrix composed of the graphite grains to make the V color centers are produced firstly in the near of anode. Some V color centers were converted into F color centers under light illumination. Data of current and time were recorded in the process of electrolysis, with which current ~ time curves were plotted. After analysis, it is known that ionic motion and electron exchange between halogen ions and anode matrix composed each current zone together. Formation mechanism of current zones in current ~ time curves and closed relation between production of color center and formation of current zones were given. After varied experiments, in conclusion, a best effective coloration condition at temperature 450 oC, voltage DC 900 V and electrolysis time 90 min was found.A lot of V, Cu+, O 2 ? ? Va+, I-2 color center were produced in hydroxyl-doped potassium chloride polycrystals after electrolytic coloration with a pointed anode. Coloration mechanism of hydroxyl-doped potassium chloride polycrystals by electrolysis with a pointed anode was given, and by plotting current ~ time curves, process and mechanism of production of the color centers in colored hydroxyl - doped potassium chloride polycrystals were explained further.更多还原