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Preparation of LNBN thin films by RF sputtering and their dielectric properties 射频溅射制备LNBN薄膜及其介电性能
Pub Date : 1989-10-29 DOI: 10.1109/CEIDP.1989.69574
H.F. Li, Z. Meng, G. Huang
(LaNa)/sub 0.5/Bi/sub 2/Nb/sub 2/O/sub 9/ (LNBN) thin films have been prepared by RF sputtering with substrate temperatures up to 450 degrees C. The structural orientation of the annealed films versus substrate temperature is shown to be complex. The substrate temperature had a profound influence on the dielectric properties of the LNBN thin films. The LNBN thin films display a relaxation phase transition.<>
在衬底温度高达450℃的条件下,采用射频溅射法制备了(LaNa)/sub 0.5/Bi/sub 2/Nb/sub 2/O/sub 9/ (LNBN)薄膜。衬底温度对LNBN薄膜的介电性能有深远的影响。LNBN薄膜表现为弛豫相变。
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引用次数: 0
On the electrical breakdown of gaseous dielectrics-an engineering approach 气体介质的电击穿——一种工程方法
Pub Date : 1989-10-01 DOI: 10.1109/CEIDP.1989.69523
Aage Pedersen
Quantitative criteria are derived for the onset of breakdown in atmospheric air and similar weakly electronegative gases. A comparable criterion is then formulated for strongly electronegative gases such as SF/sub 6/. These criteria contain no quantities other than those which can be obtained directly from breakdown voltage measurements in a uniform field, i.e. from Paschen curve data. No specific data are required for the ionizing coefficients of the gas. The advantage, from an engineering point of view, is that it is much easier to perform reliable Paschen curve measurements than it is to measure ionization growth parameters. The price paid is that criteria formulated in this way cannot be used to yield unknown Paschen curves. The criteria can be applied to any nonuniform field configuration provided the electrostatic field distribution is known. Moreover, in many cases a simple analytical approximation to the field distribution can render an extensive calculation of the electrostatic field unnecessary. The discussion deals exclusively with situations in which the onset of breakdown in the system is synonymous with the onset of a corona discharge.<>
导出了在大气和类似的弱电负性气体中发生击穿的定量判据。然后,对强电负性气体,如SF/sub / 6/,制定了类似的判据。这些准则不包含任何量,除了可以直接从均匀场的击穿电压测量中获得的量,即从Paschen曲线数据中获得的量。气体的电离系数不需要具体的数据。从工程的角度来看,它的优点是进行可靠的Paschen曲线测量要比测量电离生长参数容易得多。所付出的代价是,以这种方式制定的准则不能用于产生未知的Paschen曲线。该准则可以应用于任何非均匀场结构,只要静电场的分布是已知的。此外,在许多情况下,对场分布的简单解析近似可以使大量的静电场计算变得不必要。讨论专门处理的情况下,击穿的开始在系统中是同义的开始电晕放电。
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引用次数: 136
Carrier traps in ethylene-styrene copolymer 乙烯-苯乙烯共聚物中的载流子捕集器
Pub Date : 1989-10-01 DOI: 10.1109/CEIDP.1989.69559
Y. Ohki, Y. Tanaka, Masaaki Ikdea
The space-charge-formation characteristics of ethylene-styrene copolymer were investigated on the basis of DC conduction, TSC (thermally stimulated current), TPC (thermal pulse current), RIC (radiation-induced current), and vacuum-ultraviolet spectroscopy measurements. The results suggest that benzene rings act as trapping centers when the styrene content is as low as 0.2 wt.%, but that they tend to assist carrier transportation due to the overlap of pi -electron clouds.<>
通过直流传导、热激发电流、热脉冲电流、辐射感应电流和真空紫外光谱测量,研究了乙烯-苯乙烯共聚物的空间电荷形成特性。结果表明,苯乙烯含量低至0.2 wt.%时,苯环作为捕获中心,但由于π -电子云的重叠,苯环倾向于辅助载流子的输运。
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引用次数: 2
Effect of mobile conducting particles on the electrical strength of the insulation system of SF/sub 6/ insulated switchgear 流动导电微粒对SF/sub - 6/绝缘开关柜绝缘系统电气强度的影响
Pub Date : 1989-01-01 DOI: 10.1109/CEIDP.1989.69593
K. Labus-Nawrat, S. Grzybowski
The authors present data obtained from tests conducted on an SF/sub 6/ GIS (gas-insulated switchgear) model, 123 kV, having coaxial cylinders of 240/80-mm diameter in the presence of mobile particles. In the case of a vertical GIS construction and in the presence of conducting particles, a great hazard to the insulation is shown to occur when overvoltages appear in service. There is a wide range of imminent particles since heavy and light particles are included. The presence of conducting particles in the case of a conic spacer insulator also causes a hazard to insulation due to overvoltages appearing in service. The detection of particles left after final assembly on site and of those located on the spacer insulators which were tested in 123-kV GIS is possible using tests with applied 185 kV AC voltage and tests with impulse voltage at 80% basic insulation level.<>
作者提供了在SF/sub 6/ GIS(气体绝缘开关设备)模型上进行的测试数据,123 kV,具有240/80毫米直径的同轴圆柱体,存在流动颗粒。在垂直GIS结构和导电颗粒存在的情况下,当使用中出现过电压时,会对绝缘产生很大的危害。临近粒子的范围很广,因为包括了重粒子和轻粒子。在圆锥间隔绝缘体的情况下,导电颗粒的存在也会由于在使用中出现过电压而对绝缘造成危害。通过施加185千伏交流电压和80%基本绝缘水平冲击电压的测试,可以检测现场最终组装后留下的颗粒,以及在123千伏GIS中测试的间隔绝缘子上的颗粒。
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引用次数: 0
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