The Permittivity and Attenuation in Polycrystalline and Single-Crystal Ice Ih at 35 and 60 MHz
The Permittivity and Attenuation in Polycrystalline and Single-Crystal Ice Ih at 35 and 60 MHz
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35 和 60 MHz 下多晶和单晶 Ice Ih 的介电常数和衰减
DOI：
10.3189/s002214300002178x
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发表时间：
1975
影响因子：
3.4
通讯作者：
P. A. Charette
中科院分区：
文献类型：
--
作者：
G. P. Johari;P. A. Charette
摘要 在 —25°C 至 — 0.2 °C 温度范围内，报告了实验室生长的多晶和单晶冰 Ih 在 35 和 60 MHz 下的相对介电常数 ∊’ 和衰减 α。在 35 MHz 和 — 1°C 下的 ∊’ 和 α 分别为 3.208±0.010 和 6.2±0.1 dB/100 m。通过比较垂直于 c 轴测量的多晶冰和单晶冰各自的 ∊’ 和 α，得出的结论是，这些频率下的任何偏振各向异性都很小，以至于无法检测到。在可能导致冰各向异性的几个因素中，电子极化对在 1°C 和低于 500 THz 的频率下平行和垂直于 c 轴测量的相对介电常数之间的差异贡献了 0.0037。实验表明，高达 100 bar 的单轴压应力产生的塑性变形不会影响 35 和 60 MHz 下冰的 ∊’ 和 α。
Abstract The relative permittivity ∊’ and attenuation α in laboratory-grown, polycrystalline and single-crystal ice Ih are reported at 35 and 60 MHz in the temperature range —25°C to — 0.2 ° C. The ∊’ and α at 35 MHz and — 1° C are 3.208±0.010 and 6.2±0.1 dB/100 m, respectively. From a comparison between the respective ∊’ and α of the polycrystalline and single-crystal ice measured perpendicular to the c-axis, it is concluded that any anisotropy of polarization at these frequencies is so small as to be undetectable. Amongst several factors that may contribute to anisotropy in ice, electronic polarization contributes 0.0037 to the difference between the relative permittivity measured parallel and perpendicular to the c-axis at — 1° C and at frequencies less than 500 THz. Experiments have shown that the plastic deformation resulting from a uniaxial compressive stress of up to 100 bar does not influence the ∊’ and α of ice at 35 and 60 MHz.