Very high-performance dielectric properties of Ca1-3x/2YbxCu3Ti4O12 ceramics

被引：84
|
作者：
Boonlakhorn, Jakkree [1 ]
Thongbai, Prasit [2 ,3 ]
Putasaeng, Bundit [4 ]
Yamwong, Teerapon [4 ]
Maensiri, Santi [5 ]
机构：
[1] Khon Kaen Univ, Mat Sci & Nanotechnol Program, Fac Sci, Khon Kaen 40002, Thailand
[2] Khon Kaen Univ, Dept Phys, Fac Sci, Khon Kaen 40002, Thailand
[3] Khon Kaen Univ, INRC, Khon Kaen 40002, Thailand
[4] Natl Met & Mat Technol Ctr MTEC, Pathum Thani 12120, Thailand
[5] Suranaree Univ, Inst Sci, Sch Phys, Nakhon Ratchasima 30000, Thailand
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2014年 / 612卷
关键词：
Impedance spectroscopy; Electrical conductivity; Dielectric permittivity; Loss tangent; Grain boundary; DOPED CACU3TI4O12 CERAMICS; SOL-GEL PROCESS; ELECTRICAL-PROPERTIES; Y2/3CU3TI4O12; CERAMICS; LOSS TANGENT; CONSTANT; ACU(3)TI(4)O(12); MICROSTRUCTURE; PERMITTIVITY; RESPONSES;
D O I：
10.1016/j.jallcom.2014.05.143
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Dielectric properties of Ca1-3x/2YbxCu3Ti4O12 ceramics were investigated. Grain growth of CaCu3Ti4O12 ceramics was strongly inhibited by Yb3+ doping ions, which can be ascribed to the effect of solute drag of an aliovalent Yb3+ dopant. High dielectric permittivity (epsilon' = 1.6 x 10(4)) and very low loss tangent (tan delta = 0.015) at 1 kHz with good temperature stability of epsilon' ranging from 70 to 130 degrees C (Delta epsilon' < +/- 15%) were achieved in a Ca0.925Yb0.05Cu3Ti4O12 ceramic prepared by a modified sol gel method. epsilon' was found to be nearly independent of frequency (10(2)-10(6) Hz) and dc voltage (0-40 V). Notably, the grain boundary resistances of Ca1-3x/2YbxCu3Ti4O12 ceramics at room temperature were estimated to be similar to 0.7-12.5 G Omega cm. Very high-performance dielectric properties of Ca1-3x/2YbxCu3Ti4O12 ceramics were primary attributed to their improved electrical response at grain boundaries. (C) 2014 Elsevier B.V. All rights reserved.
引用
收藏
页码：103 / 109
页数：7
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