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Publication
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| Title of Article |
Nonlinear electrical properties and giant dielectric response in Na1/
3Ca1/3Y1/3Cu3Ti4O12 ceramic |
| Date of Acceptance |
9 February 2017 |
| Journal |
| Title of Journal |
Materials Research Bulletin |
| Standard |
SCOPUS |
| Institute of Journal |
Elsevier Ltd. |
| ISBN/ISSN |
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| Volume |
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| Issue |
90 |
| Month |
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| Year of Publication |
2017 |
| Page |
8–14 |
| Abstract |
A new isostructural CaCu3Ti4O12–type perovskite, Na1/3Ca1/3Y1/3Cu3Ti4O12, was successfully synthesized
using a solid state reaction method. In this material, Ca–sites in the CaCu3Ti4O12 structure were occupied
by Na+, Ca2+, and Y3+ ions, each at a level of 33.3 at.%. The dielectric and non –Ohmic properties were
investigated. The mean grain sizes of the Na1/3Ca1/3Y1/3Cu3Ti4O12 ceramics sintered at 1100–1110 C for
10–15 h were of about 15 mm. All of the sintered ceramics exhibited high dielectric permittivities (e0)
and low loss tangents (tand). By optimizing sintering conditions, a high e0 1.2 104 and low tand 0.04
were achieved. Na1/3Ca1/3Y1/3Cu3Ti4O12 ceramics can exhibit nonlinear current-voltage behavior. The
existence of Cu+, Cu3+, and Ti3+ ions was confirmed using an X–ray Absorption Near Edge Structure
(XANES) and X–ray photoelectron spectroscopic analyses. The n–type semiconductivity inside the grains
was primarily caused by the presence of Ti3+ ions, while the existence of Cu+ and Cu3+ may also have an
effect on conduction inside the grains. Using impedance and admittance spectroscopy analyses under
different conditions (i.e., varying frequency, temperature and DC bias), the giant dielectric response and
nonlinear electrical properties could be well explained based on the internal barrier layer capacitor
model. |
| Keyword |
CCTO, Non–ohmic properties, Giant dielectric constant, Loss tangent |
| Author |
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| Reviewing Status |
มีผู้ประเมินอิสระ |
| Status |
ตีพิมพ์แล้ว |
| Level of Publication |
นานาชาติ |
| citation |
false |
| Part of thesis |
true |
| Attach file |
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| Citation |
0
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Journal Publication
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