Electrode effects in positive temperature coefficient and negative temperature coefficient devices measured by complex-plane impedance analysis

D. P. Cann, Clive A. Randall

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

Impedance spectroscopy in conjunction with capacitance measurements were utilized to study the electrical contact behavior of commercial positive temperature coefficient and negative temperature coefficient ceramics. The impedance spectroscopy data, measured at frequencies ranging from 100 Hz to 40 MHz, exhibited a double semi-circle shape characteristic of systems which have both barrier and bulk contributions to the impedance of the device. From the impedance data, equivalent capacitive-resistive circuits were assigned to grain, grain boundary, and barrier elements. These barrier capacitances and resistances were measured for Au, Ag, Pt, and In-Ga electrodes. The trends in the magnitude of the barrier resistance are discussed with relevance to the thermodynamic work of adhesion and the effect of metal-oxygen and metal-metal interactions at the interface.

Original languageEnglish (US)
Pages (from-to)1628-1632
Number of pages5
JournalJournal of Applied Physics
Volume80
Issue number3
DOIs
StatePublished - Aug 1 1996

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impedance
electrodes
coefficients
capacitance
metals
temperature
spectroscopy
electric contacts
adhesion
grain boundaries
ceramics
trends
thermodynamics
oxygen
interactions

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

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abstract = "Impedance spectroscopy in conjunction with capacitance measurements were utilized to study the electrical contact behavior of commercial positive temperature coefficient and negative temperature coefficient ceramics. The impedance spectroscopy data, measured at frequencies ranging from 100 Hz to 40 MHz, exhibited a double semi-circle shape characteristic of systems which have both barrier and bulk contributions to the impedance of the device. From the impedance data, equivalent capacitive-resistive circuits were assigned to grain, grain boundary, and barrier elements. These barrier capacitances and resistances were measured for Au, Ag, Pt, and In-Ga electrodes. The trends in the magnitude of the barrier resistance are discussed with relevance to the thermodynamic work of adhesion and the effect of metal-oxygen and metal-metal interactions at the interface.",
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AB - Impedance spectroscopy in conjunction with capacitance measurements were utilized to study the electrical contact behavior of commercial positive temperature coefficient and negative temperature coefficient ceramics. The impedance spectroscopy data, measured at frequencies ranging from 100 Hz to 40 MHz, exhibited a double semi-circle shape characteristic of systems which have both barrier and bulk contributions to the impedance of the device. From the impedance data, equivalent capacitive-resistive circuits were assigned to grain, grain boundary, and barrier elements. These barrier capacitances and resistances were measured for Au, Ag, Pt, and In-Ga electrodes. The trends in the magnitude of the barrier resistance are discussed with relevance to the thermodynamic work of adhesion and the effect of metal-oxygen and metal-metal interactions at the interface.

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