AC charging/discharging of de-alloyed Si-Al-V alloy ribbons

JOURNAL OF ALLOYS AND COMPOUNDS

卷:586

Article

Fukuhara, M.^1,2  Yoshida, H.^1,2 

[1] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan

[2] Res Inst Electromagnet Mat, Sendai, Miyagi 9820807, Japan

关键词: Metals and alloys;    Rapid-solidification;    Quenching;    Dielectric response;    Capacitance spectroscopy;   

DOI  :  10.1016/j.jallcom.2013.03.201

来源: Elsevier

【 摘 要 】

In anticipation of prompt ac charging/discharging characteristics, the capacitance of de-alloyed Si1-x(Al-0.5,V-0.5)(x) (x = 0.15, 0.2, 0.3, and 0.4) alloy ribbons with resistivities of 0.01-4300 Omega cm was measured as a function of frequency between 1 mHz and 1 MHz, using exponential transient analysis for electric charging/discharging. The capacitance of de-alloyed Si-7.5 at.%.Al-7.5 at.%. V obtained by prompt (100 ms-25 ns) charging/discharging decreased logarithmically from 105 mu F to 18 pF as frequency increased from 1 mHz to 10 kHz, and then saturated between 10 kHz and 1 MHz. From the observed electrode distance dependence on capacitance, we deduced that the alloy consisted of a distributed constant equivalent circuit (series with 1.2% parallel), analogous to electric double layer capacitors. (C) 2013 Elsevier B. V. All rights reserved.

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