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Title: Hydrogen-induced modifications of electrical properties of insulating ferrites
Other Titles: 氢致绝缘铁氧体材料电学改性研究
Authors: Wang, LH
Cao, JL
Zhang, L
Qiao, LJ
Gu, HW
Wang, Y 
Keywords: Ferrite
Dielectric properties
Issue Date: 2010
Publisher: 中國學術期刊 (光盤版) 電子雜誌社
Source: 稀有金属 (Chinese journal of rare metals), May 2010, v. 34, no. 3, p. 368-372 How to cite?
Journal: 稀有金属 (Chinese journal of rare metals) 
Abstract: 研究了在电化学原子氢作用下绝缘NiZnCu铁氧体陶瓷的电阻和介电性能变化,并研究了电化学原子氢处理所用阴极电流密度(30~120 A.m-2)和温度(20~60℃)对氢致半导化的影响。研究结果表明,在原子氢处理初期,绝缘N iZnCu铁氧体陶瓷电阻率急剧下降,出现半导化,然后随处理时间延长而下降减缓,并逐渐趋稳;介电常数随原子氢处理时间延长而逐渐增加,达到一个极大值后,又出现下降。电流密度与温度对铁氧体半导化的速率和程度的影响没有简单的单向关系。在120 A.m-2,40℃下进行原子氢处理时,铁氧体电阻率降低最快,在2 m in内从8.29×108Ω.m下降到1.32Ω.m,下降了近9个数量级,且电阻率下降趋稳后的取值最小。从氢致N iZnCu铁氧体陶瓷半导化的过程,即吸附-侵入-扩散理论解释了温度以及电流密度对半导化的影响。并从电化学原子氢对铁氧体的掺杂和化学反应作用,对NiZnCu铁氧体绝缘陶瓷电阻和介电性能的变化进行了探讨。
Electrochemical atomic hydrogen-induced modifications of electrical properties of insulating NiZnCu ferrite ceramics and the effects of electrochemical cathodic current density(30~120 A·m-2) and temperature(20~60 ℃) of atomic hydrogen treatment were investigated.It was shown that the resistivity of NiZnCu ferrite ceramics decreased rapidly at the initial stage of the atomic hydrogen charging and the ferrite ceramics became semiconductive.Then with increasing hydrogen charging time,the resistivity decreased less rapidly and tended to remain stable.The permittivity increased with increasing hydrogen charging time and then started to decrease after reaching a maximum value.There was no simple monotonous effects of the current density and temperature on the rate and degree of the semiconduction of the ferrite.Under hydrogen charging with a current density of 120 A·m-2 at 40 ℃,the resistivity decreased the most rapidly from 8.29×108 Ω·m to 1.32 Ω·m by nearly nine orders of magnitude in two minutes.Furthermore,the resistivity was the smallest after it tended to remain stable.The influences of the current density and temperature on the semiconductive velocity were interpreted from the process of the hydrogen-induced NiZnCu ferrite semiconduction,namely the adsorption-invasion-diffusion theory.Modifications of the resistivity and dielectric properties of insulating NiZnCu ferrite ceramics were analyzed from the viewpoints of the doping effects and chemical reactions induced by the electrochemical atomic hydrogen.
ISSN: 0258-7076
Rights: © 2010 中国学术期刊电子杂志出版社。本内容的使用仅限于教育、科研之目的。
© 2010 China Academic Journal Electronic Publishing House. It is to be used strictly for educational and research purposes.
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