Na1/3Ca1/3Bi1/3Cu3Ti4O12: A new giant dielectric perovskite ceramic in ACu3Ti4O12 compounds

被引：60

作者：

Kum-onsa, Pornsawan ^{[1
]}

Thongbai, Prasit ^{[2
]}

Putasaeng, Bundit ^{[3
]}

Yamwong, Teerapon ^{[3
]}

Maensiri, Santi ^{[4
]}

机构：

[1] Khon Kaen Univ, Fac Sci, Mat Sci & Nanotechnol Program, Khon Kaen 40002, Thailand

[2] Khon Kaen Univ, Fac Sci, Dept Phys, Khon Kaen 40002, Thailand

[3] Natl Met & Mat Technol Ctr MTEC, Pathum Thani 12120, Thailand

[4] Suranaree Univ Technol, Inst Sci, Sch Phys, Nakhon Ratchasima 30000, Thailand

来源：

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2015年 / 35卷 / 05期

关键词：

Perovskite oxide; Loss tangent; Dielectric permittivity; Microstructure; PERMITTIVITY; BEHAVIOR; CONSTANTS; BARRIER; ROUTE;

D O I：

10.1016/j.jeurceramsoc.2014.11.028

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

A new approach to achieve a novel perovskite ceramic compound, ACu(3)Ti(4)O(12), is presented. A-sites in the ACu(3)Ti(4)O(12) structure were occupied by Na+, Ca2+, and Bi3+ each at a level of similar to 33.3 at.%, leading to formation of Na1/2Ca1/3Bi1/3Cu3Ti4O12. This ceramic exhibited a low loss tangent (tan delta similar to 0.038) and a high epsilon' value of similar to 2.5 x 10(4) at 1 kHz with good temperature stability. The high-frequency dielectric relaxation behavior showed activation energies of 0.110-0.121 eV. Nonlinear J-E characteristics were observed, indicating the existence of Schottky barriers at grain boundaries. Valence states of Cu cations (i.e., Cu+, Cu2+, and Cu3+) in Na1/3Ca1/3Bi1/3Cu3Ti4O12 ceramic were investigated using X-ray photoelectron spectroscopy. Impedance spectroscopy analysis revealed that Na1/3Ca1/3Bi1/3Cu3Ti4O12 was electrically heterogeneous and comprised of semiconducting grains and insulating grain boundaries. Interfacial polarization at the insulating layer of grain boundaries was suggested to be the origin of this high dielectric response. (C) 2014 Elsevier Ltd. All rights reserved.

引用

页码：1441 / 1447

页数：7

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