| Autor: |
Ugendar, Kodam, Kumar, Hanuma, Markaneyulu, G., Rani, G. Neeraja, Singh, Biswas, Das |
| Předmět: |
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| Zdroj: |
AIP Conference Proceedings; 2018, Vol. 1942 Issue 1, p1-1, 1p |
| Abstrakt: |
The dielectric and impedance spectroscopic properties of NiFe1.95R0.05O4 (R = Y, Yb and Lu) were investigated. The materials were prepared by solid state reaction and crystallized in the cubic inverse spinel phase with a very small amount additional phase of RFeO3 (R = Y, Yb and Lu) as secondary phase. The scanning electron micrograph images clearly show grains (∼2μm) which are separated by thin grain boundaries. The presences of all elements were confirmed by the energy dispersive X-ray elemental mapping. The frequency variation of ε’ shows the dispersion, following the Koop’s phenomenological theory, which considers the dielectric structure as an inhomogeneous medium of two-layers of the Maxwell-Wagner type. Impedance spectroscopic analysis indicates the different relaxation mechanisms, which corresponds to bulk grain and grain-boundaries. Their contributions to the electrical conductivity and capacitance of these materials were discussed in detailed. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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