Doping mechanisms and impedance study of Ba-substituted bismuth magnesium niobate pyrochlores

被引:7
作者
Dasin, N. A. M. [1 ]
Tan, K. B. [1 ]
Zainal, Z. [1 ]
Khaw, C. C. [2 ]
Chen, S. K. [3 ]
机构
[1] Univ Putra Malaysia, Fac Sci, Dept Chem, Serdang 43400, Selangor, Malaysia
[2] Univ Tunku Abdul Rahman, Lee Kong Chian Fac Engn & Sci, Dept Mech & Mat Engn, Kajang 43000, Selangor, Malaysia
[3] Univ Putra Malaysia, Fac Sci, Dept Phys, Serdang 43400, Selangor, Malaysia
关键词
Pyrochlore; Solid-state reaction; Doping mechanism; Dielectric; Impedance spectroscopy; DIELECTRIC-PROPERTIES; ELECTRICAL-PROPERTIES; CRYSTAL-CHEMISTRY; PHASE-EQUILIBRIA; CERAMICS;
D O I
10.1007/s10832-019-00188-1
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
Here we investigated the doping mechanisms and electrical properties of Ba-substituted Bi3.36Mg1.92-xBaxNb2.72O14.36 (BMBN) pyrochlores. Phase-pure BMBN pyrochlores prepared by solid-state reaction were found to crystallise in a cubic structure (Fd3m; No. 227) with their lattice parameters in the range 10.5968(16) - 10.5879(3) angstrom. The Scanning Electron Microscopy (SEM) analysis revealed that BMBN pyrochlores were composed of irregular shaped grains and their estimated crystallite sizes by both Williamson-Hall and Scherrer methods were in the range 50-75 nm and 60-70 nm, respectively. Neither thermal event nor significant weight loss was observed over the studied temperature range similar to 30-1000 degrees C, confirming that BMBN pyrochlores were thermally stable with negligible Bi2O3 loss. The high activation energies in the range 1.18-1.30 eV, as determined by the Arrhenius conductivity plots, showed BMBN pyrochlores to be highly insulating. The dielectric constants, epsilon' and dielectric losses, tan delta were found in the range 147-183 and 7.9 x 10(-2) - 9.6 x 10(-2) at similar to 30 degrees C and 1 MHz. Negative temperature coefficient of capacitances, TCC, in the range (-478) - (-688) ppm/degrees C were recorded over similar to 30-300 degrees C at 1 MHz.
引用
收藏
页码:41 / 50
页数:10
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