期刊
JOURNAL OF TAIBAH UNIVERSITY FOR SCIENCE
卷 17, 期 1, 页码 -出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/16583655.2023.2204809
关键词
Polaron hopping; manganite; impedance spectroscopy; dielectric properties
This paper investigates the effects of Aluminum-doping on the micro-structural and dielectric properties of La0.7Sr0.25Na0.05Mn0.95Al0.05O3 ceramics. The X-ray diffraction analysis confirms the formation of a rhombohedral phase in the R3 space group. The complex impedance spectroscopic techniques reveal the contribution of two conducting phases, associated with grains and grain boundaries, in the Nyquist diagram.
The present paper reports on the effects of Aluminum-doping on the micro-structural and dielectric properties of La0.7Sr0.25Na0.05Mn0.95Al0.05O3 ceramics. The analyses of the X-ray diffraction data by the Rietveld refinement technique confirmed the formation of a rhombohedral phase in the R3 space group. The dielectric properties were analyzed by the complex impedance spectroscopic techniques in a wide temperature extent and a spectral range between 2 kHz and 1 MHz. The Nyquist diagram with a single semicircular arc is explained by the contribution of two conducting phases associated with the effects of grains and grain boundaries. The conductivity spectrum obeyed Jonscher ' s power law and the conduction mechanism was attributed to the correlated barrier hopping mechanism. The dielectric parameters such as the dielectric constant (epsilon(n)) showed a compositional dependence, indicating the prevalence of inter-grain conductive contribution and microstructural features which can be interpreted by the Maxwell-Wagner process.
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