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Electrical Relaxation in Saline Ice

 

作者: J. R. Addison,  

 

期刊: Journal of Applied Physics  (AIP Available online 1970)
卷期: Volume 41, issue 1  

页码: 54-63

 

ISSN:0021-8979

 

年代: 1970

 

DOI:10.1063/1.1658377

 

出版商: AIP

 

数据来源: AIP

 

摘要:

The experimentally observed frequency dispersions of the complex dielectric coefficient for some samples of artificial saline ice (of a type similar to natural sea ice) are examined with a view to identifying major contributing mechanisms. The simultaneous integral equations describing the linear superposition of relaxation processes having a continuum of relaxation times were inverted numerically to yield histogram representations of the relaxation time distribution function between 10−9and 10−1sec. These functions exhibited three main features: (1) an abrupt peak near 10−9sec, responsible in part for the high frequency dispersion (above 1 MHz), and which is attributed to polarization of the elongated conductive brine cells within the ice (Maxwell‐Wagner‐Sillars dispersion); (2) a hump between 10−6and 10−4sec which shifts towards shorter relaxation times at higher temperatures, showing an activation energy similar to that of protons in pure ice—this mechanism is seen at midfrequencies (1 KHz‐1 MHz); and (3) a wide mass at longer relaxation times commencing between 10−4and 10−3sec which is probably associated with space‐charge polarization arising from movement of the ions within continuous brine channels reaching from one electrode to the other.

 

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