01521nas a2200241   4500008004100000022001400041245009600055210006900151260007300220300001400293490000700307520065900314653002000973653002700993653001901020100001901039700001601058700001601074700002001090700002001110700002501130856012401155       2005                        eng d  a0167-577X00aSynthesis of chromium substituted nano particles of cobalt zinc ferrites by coprecipitation0 aSynthesis of chromium substituted nano particles of cobalt zinc   aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcNOV  a3402-34050 v593 a<p>Nano particles of chromium substituted cobalt zinc ferrite have been synthesized by a chemical co-precipitation method. X-ray diffraction studies of the nano particles of CrxCo0.5-xZn0.5Fe2O4 (x = 0.1 to 0.5) heat-treated at 300 degrees C show that the particle sizes are in the range of 2 to 7 nm. Room temperature Fe-57 Mossbauer spectra of all the samples show only two doublets, confirming the presence of superparamagnetic relaxation in the nano particles. An exponential decrease in the superparamagnetic blocking temperature, with increasing chromium concentration, is observed for these samples. (C) 2005 Elsevier B.V. All rights reserved.</p>10aCo0.5Zn0.5Fe2O410aMossbauer spectroscopy10anano materials1 aSharma, R., K.1 aSuwalka, O.1 aLakshmi, N.1 aVenugopalan, K.1 aBanerjee, Abhik1 aJoy, Pattayil, Alias  uhttps://library.ncl.res.in/content/synthesis-chromium-substituted-nano-particles-cobalt-zinc-ferrites-coprecipitation-0