电介质
空间电荷
极化(电化学)
电导率
质子
导线
化学
原子物理学
介电损耗
极化子
凝聚态物理
电阻率和电导率
时间常数
硼砂
核磁共振
分析化学(期刊)
欧姆
材料科学
物理
电子
电气工程
原材料
光电子学
有机化学
物理化学
色谱法
量子力学
复合材料
工程类
出处
期刊:Physica
[Elsevier]
日期:1963-03-01
被引量:7
标识
DOI:10.1016/s0031-8914(63)80279-7
摘要
Synopsis * AC protonic polarization effects in borax were studied by dielectric measurements between 1 Hz and 300 kHz. At very low frequencies a conductivity loss was observed corresponding with a resistivity ρ = 3.8 × 10 6 ohm.m. The rest of the dispersion could be resolved into two overlapping contributions I and II with relative dielectric constants changing from κ′ s = 575 at very low frequencies to κ′ ∞ = 4 at high frequencies. Loss mechanism I was ascribed to mobile protons and Macdonald's theory of AC space-charge polarization was applied to calculate the mobility μ and the proton concentration N. Loss mechanism II was attributed to proton displacements over molecular distances. DC polarization effects were studied at constant field strengths between 200 and 8 × 10 4 V/m. The currents all showed an exponential decrease with a characteristic time τ = 300 sec, independent of the applied voltage and followed by a much slower decrease with a characteristic time τ ′ = 2 × 10 4 sec. This was ascribed to a finite rate of discharge of protons and space-charge formation. From, space-charge limited currents the same mobility was calculated as from the dielectric measurements. The values μ = 1.8 × 10 −4 m 2 /Vs and N = 10 16 m −3 are consistent with all the experimental observations.
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