| Title of Article |
Effects of DC bias on non-ohmic sample-electrode contact and grain boundary responses in giant-permittivity La1.7Sr0.3Ni1−xMgxO4 ceramics |
| Date of Acceptance |
19 September 2016 |
| Journal |
| Title of Journal |
RSC advances |
| Standard |
ISI |
| Institute of Journal |
The Royal Society of Chemistry |
| ISBN/ISSN |
|
| Volume |
6 |
| Issue |
94 |
| Month |
กันยายน |
| Year of Publication |
2018 |
| Page |
91377-91385 |
| Abstract |
The effects of DC bias on the giant dielectric properties and electrical responses of non-Ohmic sample-electrode contact and grain boundaries of La1.7Sr0.3Ni1 xMgxO4 (x=0-0.5) ceramics were studied. La1.7Sr0.3Ni1-xMgxO4 ceramics were prepared using a chemical combustion method with urea as fuel. A pure phase and dense ceramic microstructure were achieved. Using impedance spectroscopy analysis under a DC bias, the giant dielectric properties of an un-doped La1.7Sr0.3NiO4 ceramic were found to be due to a combination of the small polaronic hopping mechanism and non-Ohmic sample-electrode contact effect. This was confirmed by a linear Mott-Schottky plot of 1/C^2 vs. DC bias voltage. Doping La1.7Sr0.3NiO4 ceramics with Mg^2+ ions caused an increase in the grain boundary resistance, leading to a decrease in the loss tangent and degradation of the electrode effect. The giant dielectric response in La1.7Sr0.3Ni1 xMgxO4 ceramics (x=0.3-0.5) was primarily attributed to the insulating grain boundary response (i.e., Maxwell-Wagner polarization) coupled with small polaronic hopping of charge carriers. |
| Keyword |
DC bias; Giant dielectric permittivity; DC conduction; Schottky barrier |
| Author |
|
| Reviewing Status |
มีผู้ประเมินอิสระ |
| Status |
ตีพิมพ์แล้ว |
| Level of Publication |
นานาชาติ |
| citation |
true |
| Part of thesis |
true |
| Attach file |
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| Citation |
0
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Publication
Journal Publication
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