Electrical properties of lunar soil sample 15301,38
Electrical properties of lunar soil sample 15301,38
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月壤样品的电特性15301,38
DOI：
10.1029/jb079i011p01599
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发表时间：
1974
期刊：
影响因子：
--
通讯作者：
D. Strangway
中科院分区：
文献类型：
--
作者：
G. Olhoeft;A. L. Frisillo;D. Strangway
对阿波罗15号月球土壤样品在室温至827°C的真空中进行了100 Hz至1 MHz频谱的电特性测量。测量了介电常数、总交流损耗角正切和直流电导率。直流电导率没有显示出热滞后，但在700°C以上加热和随后冷却期间的介电损耗角正切中发现了不可逆的（真空中）热效应。这似乎与月球玻璃在700°C以上的几种效应有关。随着温度的升高，样品的介电常数还表现出特征性的低频分散，这可能是由于麦克斯韦-瓦格纳粒间效应造成的。介电性质可以拟合到涉及Cole-Cole频率分布的模型，所述Cole-Cole频率分布在低于200°C时与温度相对无关，并且在高于200°C时遵循具有2.5eV的激活能的玻尔兹曼温度分布。直流电导率符合指数温度分布，并在700°C以上成为主要损耗。
Electrical property measurements have been made on an Apollo 15 lunar soil sample in ultrahigh vacuum from room temperature to 827°C for the frequency spectrum from 100 Hz through 1 MHz. The dielectric constant, the total ac loss tangent, and the dc conductivity were measured. The dc conductivity showed no thermal hysteresis, but an irreversible (in vacuum) thermal effect was found in the dielectric loss tangent on heating above 700°C and during the subsequent cooling. This appears to be related to several effects associated with lunar glass above 700°C. The sample also showed characteristic low frequency dispersion in the dielectric constant with increasing temperature, presumably due to Maxwell-Wagner intergranular effects. The dielectric properties may be fitted to a model involving a Cole-Cole frequency distribution that is relatively temperature independent below 200°C and follows a Boltzmann temperature distribution with an activation energy of 2.5 eV above 200°C. The dc conductivity is fitted by an exponential temperature distribution and becomes the dominant loss above 700°C.