ELECTRICAL RELAXATION STUDIES OF NANOCRYSTALLINE Na3Cr2(PO4)3 PREPARED BY SOLUTION COMBUSTION
Na3Cr2(PO4)3 nano-crystalline material of NASICON family is prepared by solution combustion synthesis. Glycine is used as fuel in the solution combustion synthesis. Ac electrical parameters of Na3Cr2(PO4)3 crystallites are analyzed in σ*(ω), Z*(ω), ε*(ω) and M*(ω) formalisms. Ac conductivity shows power law dispersion with the presence of low frequency electrode polarization. The conductivity relaxation time determined from the modulus formalism; which associates with activation energy of 0.66eV. This matches with dc conduction activation of 0.69eV from impedance formalism. This implies a hopping mechanism for ion conduction in the material. Electrode polarization adds to the high value of dielectric permittivity at low frequency. Imaginary part of permittivity, ε(ω), doesnt show any loss peak due to high ionic conductivity. The dielectric relaxation phenomenon is determined from the frequency dependent loss peak of dissipation factor, tanδ. The dielectric relaxation time and activation energy are calculated form dielectric loss peak.
LAKSHMI VIJAYAN RAJESH CHERUKU G. GOVINDARAJ S. RAJAGOPAN
Department of Physics, School of Physical, Chemical and Applied Sciences, Pondicherry University Pon Department of Chemistry, Pondicherry Engineering College, Puducherry 605 014
国际会议
The 12th Asian Conference on Solid State Ionics(第十二届亚洲固态离子学会议暨第十五届中国固态离子学会议)
武汉
英文
112-119
2010-05-02（万方平台首次上网日期，不代表论文的发表时间）