共查询到19条相似文献,搜索用时 140 毫秒
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研究了掺杂稀土元素Nd对ITO粉末粒径大小、电学及光学性能的影响.实验结果表明,掺入Nd后在形貌上表现为随着掺杂量的增加,ITO粉末的粒径变小;在光学性能上表现为ITO粉末位于500-1000 cm-1的红外吸收峰向短波方向发生蓝移;在电学性能上表现为随着掺杂量的增加,ITO粉末的电阻率逐渐增加. 相似文献
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ITO纳米粉末爆炸压实烧结致密化陶瓷靶材研究 总被引:6,自引:0,他引:6
对ITO商业复合粉末应用爆炸冲击方法压实烧结,并对样品进行了XRD和ESM检测.通过粉末和压实后样品的XRD图及SEM照片的比较,发现在爆炸冲击压实纳米ITO陶瓷粉末时,能够使晶粒度减小,有助于后续烧结密实过程中控制ITO靶材的晶粒度的过分长大;SEM图片显示,在1200℃烧结的靶材微观结构比较均匀.本文探索了纳米ITO粉末冲击压实烧结的微观机理,并与以往人们对粉末的冲击沉能结论进行了比较,得出结论:压实烧结的主要机理是破碎填充效应,使得一部分粉末颗粒表面原子间的距离达到了点阵量级,从而产生键合力;一部分表面原子间的距离达到了一定小的程度,Vander Waals力使其结合. 相似文献
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氯离子与铟离子的总浓度比对铟锡氧化物前驱体氢氧化物)粒径的影响 总被引:1,自引:0,他引:1
用络盐法制备了铟锡氧化物(ITO)纳米粉末. 通过对铟和锡的络合盐[(NH4)2InCl5·H2O和(NH4)2SnCl6]的制备研究, 证实了反应初始溶液中络离子的存在. 通过调节氯离子与铟离子的总浓度比研究了络离子对ITO前驱体(氢氧化物)粒径的影响. 提出了络离子对纳米ITO粉末粒径的影响原理: 络离子的存在, 降低了反应初始溶液中游离In 3+和Sn 4+的浓度, 有利于纳米级ITO粉末的生成. 通过XRD和激光粒度仪对ITO前驱体(氢氧化物)进行了表征. 相似文献
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热处理温度对纳米ITO粉体形成的影响 总被引:1,自引:0,他引:1
纳米ITO粉体是光电材料中很重要的的基础材料。文章主要研究了水相共沉淀法制备ITO粉体过程中,热处理温度对粉体形成过程的影响,并用TG—DTA、TEM和XRD对其作了表征分析。结果表明,ITO前驱体在320℃以上发生晶型转变成ITO粉体,并随着温度的升高,粉体晶粒长大。在700℃左右,晶粒粒径最小,比表面积最大,团聚系数最小,粒径分布均匀,单分散性能好,无团聚现象。温度过高时,因烧结现象的发生,可能产生硬团聚。 相似文献
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Previously we reported the synthesis of novel organic-inorganic composite indium tin oxide (ITO) foam precursor leading to the formation of “sponge-like” ITO by burning away the organics. This newly made sponge-like ITO possesses relatively high electrical conductivity due to phonon confinement with reasonable pore structure and may have potential application as functional materials in semiconducting dye absorbing layer in dye-sensitized solar cell (DSSC) and also as the receptor of electrons injected from the quantum dots (QDs) of organic--inorganic hybrid QD based solar cell. This report is a short review of “sponge-like” ITO described as a lecture note on its future use as an alternative new prospective material for photoanode of solar cell in the domain of sustainable energy. 相似文献
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化二车间七万吨/年聚丙烯装置的挤压造粒系统采用的是德国WP公司技术。针对运行中粉料秤出现故障造成挤压造粒机系统停车的问题,通过采集运行数据利用回归分析的方法找出生产负荷与下料旋转阀变频器控制频率之间的对应函数关系,以便用于生产实践。 相似文献
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L. S. C. Wan P. W. S. Heng C. V. Liew 《Drug development and industrial pharmacy》1994,20(16):2551-2561
Spheroids are usually produced by a multi-step extrusion-spheronization process. The single-step production of spheroids may be carried out in a rotoprocessor. The use of feed materials in powder form requires an adaptation of the spheronizer machinery. This study investigates the formation and growth of spheroids and the changes in the spheroid moisture content in a single-step agglomeration-spheronization method. There was a rapid increase in size and formfactor values when spheroids started to form and grow from the powder mix. Although there was a continual and considerable loss of moisture with time, this did not have an appreciable effect on spheroid size and shape after the spheroid formation stage as the spheroid structure had already been determined. Spheroid size increased with higher liquid spray rates. The use of higher gap air pressures resulted in a greater rate of moisture loss and the production of smaller spheroids. 相似文献