Synthesis, refinement of the structure, and AC conductivity behavior of sodium lithium orthonavadates

被引：7
|
作者：
Enneffati, Marwa [1 ]
Louati, Bassem [1 ]
Guidara, Kamel [1 ]
机构：
[1] Univ Sfax, Condensed Matter Lab, Fac Sci, BP 1171, Sfax 3000, Tunisia
来源：
IONICS | 2017年 / 23卷 / 05期
关键词：
Orthovanadates; X-ray diffraction; Impedance spectroscopy; AC conductivity; CRYSTAL-STRUCTURE; ELECTRICAL-PROPERTIES; DIELECTRIC-RELAXATION; MAGNETIC-PROPERTIES; RAMAN-SPECTROSCOPY; CATHODE MATERIAL; VANADATE; BIVO4; PERFORMANCE; MECHANISM;
D O I：
10.1007/s11581-016-1907-7
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：
The Na (x) Li1-x CdVO4 (x = 0.5, 1) orthovanadates were prepared using a solid-state reaction method. The x-ray diffraction patterns (XRDP) of both materials reveal the formation of the Na2CrO4 structure. Vibrational study confirms the existence of [VO4](3-) group. Electrical measurements of our compounds have been investigated using complex impedance spectroscopy (CIS) in the frequency and temperature range 209 Hz-1 MHz and 589-703 K, respectively. Nyquist plots reveal the presence of tow contributions, an equivalent circuit was proposed. DC conductivity shows electrical conduction in the material as a thermally activated process. The AC conductivity is explained using the non-overlapping small polaron tunneling (NSPT) conduction mechanism. A relationship between crystal structure and ionic conductivity was established and discussed.
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页码：1115 / 1129
页数：15
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