研究目的
Study of complex impedance spectroscopic properties of La0.72xDyxSr0.3MnO3 perovskite oxides.
研究成果
The insertion of a small amount of dysprosium (3%) in the La-site of La0.7Sr0.3MnO3 perovskite oxide can change the mechanism conduction of charge transport. The close value of activation energies obtained from the analyses of M0(0.491(2) eV) and conductivity data (0.535(7) eV) suggest that the mobility of the charge carrier is probably due to a hopping of Sr2t ions in the La0.67Dy0.03Sr0.3MnO3 oxide.
研究不足
The study is limited to the temperature range of 311–356 K and frequency range of 209–5 (cid:2) 107 Hz. The effects of higher temperatures and frequencies on the properties of the materials are not explored.
1：72xDyxSr3MnO3 (x = 00 and 03) manganites compounds. The phase identification and structural analysis were performed using a ‘Panalytical X pert Pro’ diffractometer with Cu-Ka radiation. The structural refinement was carried out by the Rietveld analysis of the X-Ray powder diffraction data with the help of FULLPROF software. A pellet of about 503 cm2 surface and about 14 cm thickness was used for the electrical measurements. The pellet disc was coated with Ag paste to ensure good electrical contact. All electrical measurements of real and imaginary components of the impedance parameters (Z0 and Z0) were made over a wide temperature range (311–357 K) and frequency (209–5 (cid:
2) 107 Hz) using a Tegam 3550 impedance analyser interfaced to a compatible computer.
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