Electric storage in de-alloyed Si-Al alloy ribbons

Mikio Fukuhara, Takeshi Araki, Kentaro Nagayama, Hiroshi Sakuraba

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The capacitance of de-alloyed Si 1xAl x (x=0.2, 0.3, and 0.4) alloy ribbons with resistivities of 1-1000Ωcm was measured as a function of frequency between 1mHz and 1MHz from electric charge/discharge pulse curves of 10V applied at 100ms-25ns intervals, respectively, using an exponential transient analysis for electric charging/discharging. The capacitance of the de-alloyed Si-20 at.%Al specimen obtained by prompt charging/discharging decreased logarithmically from 102μF (0.55F/cm 3) to 1.2pF (53nF/cm 3) as frequency increased from 1mHz to 1MHz. From the observed electrode distance dependence on capacitance and nonlinear electronic transport behaviour, we deduced that the alloy consisted in a distributed constant equivalent circuit (series with 1.7% parallel), analogous to electric double-layer capacitors.

Original languageEnglish
Article number47001
Issue number4
Publication statusPublished - 2012 Aug 1

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Fukuhara, M., Araki, T., Nagayama, K., & Sakuraba, H. (2012). Electric storage in de-alloyed Si-Al alloy ribbons. EPL, 99(4), [47001]. https://doi.org/10.1209/0295-5075/99/47001