Transport and Dielectric Properties of Mechanosynthesized La2/3Cu3Ti4O12 Ceramics

被引：23

作者：

Ahmad, Mohamad M. ^{[1
,2
]}

Kotb, Hicham Mahfoz ^{[1
,3
]}

Joseph, Celin ^{[1
]}

Kumar, Shalendra ^{[1
,4
]}

Alshoaibi, Adil ^{[1
]}

机构：

[1] King Faisal Univ, Dept Phys, Coll Sci, Al Ahsaa 31982, Saudi Arabia

[2] New Valley Univ, Dept Phys, Fac Sci, El Kharga 72511, Egypt

[3] Assiut Univ, Fac Sci, Phys Dept, Assiut 71516, Egypt

[4] Univ Petr & Energy Studies, Dept Phys, Dehra Dun 248007, Uttarakhand, India

来源：

CRYSTALS | 2021年 / 11卷 / 03期

关键词：

giant dielectric constant; mechanosynthesis; impedance spectroscopy; MODULUS SPECTROSCOPY; CACU3TI4O12; CERAMICS; SINTERING CONDITIONS; PHASE-TRANSITION; CONSTANT; PERMITTIVITY; TEMPERATURE; IMPEDANCE; MICROSTRUCTURE; BEHAVIOR;

D O I：

10.3390/cryst11030313

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

La2/3Cu3Ti4O12 (LCTO) powder has been synthesized by the mechanochemical milling technique. The pelletized powder was conventionally sintered for 10 h at a temperature range of 975-1025 degrees C, which is a lower temperature process compared to the standard solid-state reaction. X-ray diffraction analysis revealed a cubic phase for the current LCTO ceramics. The grain size of the sintered ceramics was found to increase from 1.5 +/- 0.5 to 2.3 +/- 0.5 mu m with an increase in sintering temperature from 975 to 1025 degrees C. The impedance results show that the grain conductivity is more than three orders of magnitude larger than the grain boundary conductivity for LCTO ceramics. All the samples showed a giant dielectric constant (1.7 x 10(3)-3.4 x 10(3)) and dielectric loss (0.09-0.17) at 300 K and 10 kHz. The giant dielectric constant of the current samples was attributed to the effect of internal barrier layer capacitances due to their electrically inhomogeneous structure.

引用

页数：11

共 33 条

[31] Ferroelectric-relaxor behavior of Ba(Ti0.7Zr0.3)O3 ceramics [J].