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Publication
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| Title of Article |
Effects of Mg2þ doping ions on giant dielectric properties and
electrical responses of Na1/2Y1/2Cu3Ti4O12 ceramics |
| Date of Acceptance |
26 July 2016 |
| Journal |
| Title of Journal |
Ceramics International |
| Standard |
SCOPUS |
| Institute of Journal |
Elsevier Ltd. |
| ISBN/ISSN |
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| Volume |
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| Issue |
42 |
| Month |
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| Year of Publication |
2017 |
| Page |
16287–16295 |
| Abstract |
Influences of Mg2þ doping ions on electrical and giant dielectric properties of Na1/2Y1/2Cu3-xMgxTi4O12
(x¼0–0.3) ceramics prepared by a conventional solid state reaction method were systematically studied.
Mg2þ doping ions were homogeneously dispersed in the microstructure and caused a large increase in
the mean grain size from 11.0 to 88.4 mm as Mg2þ concentration was increased from x¼0 to 0.3. This
resulted in a reduction of the breakdown voltage (from 3002 to 537 V cm2) and nonlinear coefficient
(from 6.79 to 5.40), indicating the importance of microstructure in controlling the nonlinear current–
voltage properties of Na1/2Y1/2Cu3Ti4O12. The grain and grain boundary responses were characterized by
admittance and impedance spectroscopy analyses, respectively. X–ray absorption near edge structure and
X–ray photoelectron analyses confirmed the presence of Cuþ, Cu3þ, and Ti3þ ions in Na1/2Y1/
2Cu3xMgxTi4O12 ceramics, indicating the complex mechanisms of conduction exist inside the grains.
Substitution of Mg2þ resulted in a small decrease in conduction inside the grains, which may primarily
be attributed to the reduction of the Ti3þ concentration. Reduced loss tangent (E0.036) and enhanced
permittivity (E2.02 104) with better temperature stability were achieved in the Na1/2Y1/
2Cu2.9Mg0.1Ti4O12 ceramic compared to the undoped sample. The dielectric relaxation behavior can be
well described using the Maxwell–Wagner relaxation model based on the internal barrier layer capacitor
structure. |
| Keyword |
Giant dielectric properties Spectroscopy, X–ray absorption near edge structure, X–ray photoelectron spectroscopy, Maxwell–Wagner polarization, CCTO |
| Author |
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| 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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Journal Publication
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