Space‐charge physics and the breakdown process
Space‐charge physics and the breakdown process
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DOI：
10.1063/1.358707
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发表时间：
1995-04
影响因子：
3.2
通讯作者：
G. Blaise
中科院分区：
文献类型：
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作者：
G. Blaise
最近已经描述了硬电介质材料中的电荷捕获[G. Blaise，IEEE Trans. Electr. Insul. EI-28，437（1993）]的基础上的极化子概念。介质的内能的局部增加高达105 -10 eV，这是由于俘获电荷周围的极化引起的。在电荷从其位置快速脱陷后晶格的弛豫将局部过剩的内能释放到介质中，当达到临界条件时产生击穿。这种情况适用于平行板电容器的电击穿，其中空间电荷是由阴极处的电子注入引起的。当介质间隙中的电场超过电荷的退陷场时，静电空间电荷的不稳定性会在阴极产生击穿。这决定了场强的最小值EM 1。在阳极击穿是由于流动电荷的捕获-去捕获。这对应于磁场强度的最大值，
The trapping of charges in hard dielectric materials has been recently described [G. Blaise, IEEE Trans. Electr. Insul. EI‐28, 437 (1993)] on the basis of the polaron concept. A local increase of the internal energy of the medium Up∼5–10 eV results from the polarization around a trapped charge. The relaxation of the lattice after a rapid detrapping of charges from their site releases the local excess of internal energy to the medium, producing breakdown when critical conditions are reached. This scenario is applied to the electric breakdown of a parallel‐plate capacitor in which the space charge results from the injection of electrons at the cathode. Breakdown at the cathode is produced by the destabilization of a static space charge when the field in dielectric gap exceeds the detrapping field of charges. This determines the minimum value ‖EM1‖ of the field strength. At the anode breakdown is due to the trapping‐detrapping of flowing charges. This corresponds to the maximum value of the field strength ‖E...