Abstract
A 'spreading resistance' contact between electrode and specimen can increase or even dominate the apparent bulk resistance of an electroceramic specimen. For true point contacts, a single arc will appear in impedance spectra, whose diameter is essentially the spreading resistance due to the contact and whose time constant is identical to that of the bulk, but with a correspondingly smaller capacitance. When a planar electrode with multiple point contacts is involved, a separate electrode arc occurs whose diameter is due to spreading resistance, but whose capacitance tends to be dominated by the 'air gap' capacitance between the electrode and the rough surface of the ceramic. In this study impedance spectroscopy was employed to study the effects of temperature, oxygen partial pressure, and mechanical loading on the contact impedance of gold electrodes on nanophase cerium dioxide. Results were confirmed by pixel-based computer simulations.
| Original language | English |
|---|---|
| Pages (from-to) | 93-104 |
| Number of pages | 12 |
| Journal | Solid State Ionics |
| Volume | 98 |
| Issue number | 1-2 |
| Publication status | Published - Jun 1 1997 |
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Keywords
- Contact impedance
- Impedance spectroscopy
- Point contact
ASJC Scopus subject areas
- Electrochemistry
- Physical and Theoretical Chemistry
- Energy Engineering and Power Technology
- Materials Chemistry
- Condensed Matter Physics
Cite this
Experimental limitations in impedance spectroscopy : Part IV. Electrode contact effects. / Hwang, Jin Ha; Kirkpatrick, K. S.; Mason, Thomas O; Garboczi, E. J.
In: Solid State Ionics, Vol. 98, No. 1-2, 01.06.1997, p. 93-104.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Experimental limitations in impedance spectroscopy
T2 - Part IV. Electrode contact effects
AU - Hwang, Jin Ha
AU - Kirkpatrick, K. S.
AU - Mason, Thomas O
AU - Garboczi, E. J.
PY - 1997/6/1
Y1 - 1997/6/1
N2 - A 'spreading resistance' contact between electrode and specimen can increase or even dominate the apparent bulk resistance of an electroceramic specimen. For true point contacts, a single arc will appear in impedance spectra, whose diameter is essentially the spreading resistance due to the contact and whose time constant is identical to that of the bulk, but with a correspondingly smaller capacitance. When a planar electrode with multiple point contacts is involved, a separate electrode arc occurs whose diameter is due to spreading resistance, but whose capacitance tends to be dominated by the 'air gap' capacitance between the electrode and the rough surface of the ceramic. In this study impedance spectroscopy was employed to study the effects of temperature, oxygen partial pressure, and mechanical loading on the contact impedance of gold electrodes on nanophase cerium dioxide. Results were confirmed by pixel-based computer simulations.
AB - A 'spreading resistance' contact between electrode and specimen can increase or even dominate the apparent bulk resistance of an electroceramic specimen. For true point contacts, a single arc will appear in impedance spectra, whose diameter is essentially the spreading resistance due to the contact and whose time constant is identical to that of the bulk, but with a correspondingly smaller capacitance. When a planar electrode with multiple point contacts is involved, a separate electrode arc occurs whose diameter is due to spreading resistance, but whose capacitance tends to be dominated by the 'air gap' capacitance between the electrode and the rough surface of the ceramic. In this study impedance spectroscopy was employed to study the effects of temperature, oxygen partial pressure, and mechanical loading on the contact impedance of gold electrodes on nanophase cerium dioxide. Results were confirmed by pixel-based computer simulations.
KW - Contact impedance
KW - Impedance spectroscopy
KW - Point contact
UR - http://www.scopus.com/inward/record.url?scp=0031166483&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0031166483&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:0031166483
VL - 98
SP - 93
EP - 104
JO - Solid State Ionics
JF - Solid State Ionics
SN - 0167-2738
IS - 1-2
ER -