01989nas a2200181   4500008004100000022001400041245006800055210006800123260012500191300001100316490000800327520130000335100002001635700001401655700001701669700001901686856010201705       2011                        eng d  a0021-897900aDielectric and spin relaxation behaviour in DyFeO3 nanocrystals0 aDielectric and spin relaxation behaviour in DyFeO3 nanocrystals  aCIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USAbAMER INST PHYSICScDEC  a1243010 v1103 a<p>We report the temperature and frequency dependent dielectric measurements and ac magnetic susceptibility of chemically synthesized DyFeO3 nanoparticles (size similar to 50-60 nm). The measurement of the dielectric properties was carried out in a broad temperature (20-325 K) and frequency (1-10(6) Hz) range. The non-Debye type dipolar relaxation phenomenon was observed in the DyFeO3 nanoparticles, as confirmed by the Cole-Cole plots. The higher values of epsilon' at the lower frequencies are explained on the basis of the Maxwell-Wagner model. The Cole-Cole analysis enabled us to separate the contribution of relaxation times, resistance and capacitance in grain and grain boundaries in DyFeO3 nanocrystals. We found that with increasing temperature, the contribution of grain boundary resistance increases in comparison to the grain resistance. We also performed spin relaxation studies in a broad temperature and frequency range. Both the in-phase (chi') and out-of-phase (chi `') components of the ac magnetic susceptibilities of the DyFeO3 nanoparticles show a clear evidence at spin reorientation transition around 70K and T-N (Dy) around 4K as reported by us in our earlier study using the dc magnetic behaviour. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3669154]</p>1 aJaiswal, Adhish1 aDas, Raja1 aMaity, Tuhin1 aPoddar, Pankaj  uhttps://library.ncl.res.in/content/dielectric-and-spin-relaxation-behaviour-dyfeo3-nanocrystals-0