01958nas a2200289   4500008004100000022001400041245007400055210006900129260009900198300001400297490000700311520103300318653001301351653002301364653000801387653001101395100001301406700002101419700001501440700002301455700001301478700001701491700001701508700001901525700002201544856010201566       2007                        eng d  a0272-884200aSynthesis of La0.7Sr0.3MnO3 at 800 degrees C using citrate gel method0 aSynthesis of La07Sr03MnO3 at 800 degrees C using citrate gel met  aTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLANDbELSEVIER SCI LTDcAUG  a1129-11320 v333 a<p>Manganite systems have been of considerable interest in the recent past due to their potential to operate in wide property range and also to serve as effective magnetic sensing and storing devices when synthesized using stringent conditions. We report a novel citrate gel method, in which La0.7Sr0.3MnO3 system has been synthesized at temperature 800 degrees C (LSMO800) with the synthesis duration is 6 h. The results have been compared with the sample synthesized at 1050 degrees C (LSMO1050). The synthesized bulk polycrystalline sample shows single-phase nature with the increase in particle size from similar to 50 nm to 300 nm with the increase in the sintering temperature. The magnetization data for LSMO800 shows well-defined hysteresis with saturation magnetization at around 1800 Oe and Curie temperature at 360 K, which is slightly lower than that of LSMO1050, which is 375 K. The results can be well attributed to the grain boundary effects. (C) 2006 Elsevier Ltd and Techna Group S.r.l. All rights reserved.</p>10aCeramics10aCitrate gel method10aCMR10aOxides1 aRavi, V.1 aKulkarni, S., D.1 aSamuel, V.1 aKale, Sangeeta, N.1 aMona, J.1 aRajgopal, R.1 aDaundkar, A.1 aLahoti, P., S.1 aJoshi, Rakesh, S.  uhttp://library.ncl.res.in/content/synthesis-la07sr03mno3-800-degrees-c-using-citrate-gel-method-002231nas a2200205   4500008004100000022001400041245008800055210006900143260010800212300001000320490000700330520146100337653001501798653001101813653002401824100002001848700002101868700001701889856011901906       2009                        eng d  a1356-536200aMicrowave dielectric and attenuation properties of Ni0.7-xCoxZn0.3Fe2O4 thick films0 aMicrowave dielectric and attenuation properties of Ni07xCoxZn03F  aHOWARD HOUSE, WAGON LANE, BINGLEY BD16 1WA, W YORKSHIRE, ENGLANDbEMERALD GROUP PUBLISHING LIMITEDcJAN  a43-460 v263 a<p>Purpose - The aim of this paper is to investigate permittivity of nano structured Ni0.7-xCoxZn0.3Fe2O4 thick films at microwave frequencies. Design/methodology/approach - Nanosized Ni0.7-xCoxZn0.3Fe2O4 ferrites with x = 0, 0.04, 0.08 and 0.12 were prepared by sucrose precursor technique using the constituent metal nitrates. Thick films of the ferrites were fabricated on alumina substrates by screen-printing technique. Microwave dielectric constant (epsilon') and the loss factor (epsilon `') for the thick films were measured by VSWR slotted section method in the 8-18 GHz range of frequencies. Microwave attenuation properties were studied using a waveguide reflectometer set up. Findings - Both the epsilon' and epsilon `' were found to vary with frequency and composition x It is observed that, value of epsilon' increases with increase in x, due to the increase in bulk density and reduction in porosity of the material, that resulted due to the substitution of cobalt in Ni-Zn ferrite. The microwave transmission loss offered by the thick films was found to increase with the increase in cobalt concentration x Within the band width of 4 GHz (from 12-16 GHz), all the films except that with x = 0.04 offered the reflection loss of less than 3 dB. Originality/value - The dielectric constant of Ni0.7-xCoxZn0.3Fe2O4 thick films have been reported for the first time. These thick films provide scope for cost effective planar ferrite devices.</p>10aMicrowaves10aOxides10aThick-film circuits1 aRendale, M., K.1 aKulkarni, S., D.1 aPuri, Vijaya  uhttp://library.ncl.res.in/content/microwave-dielectric-and-attenuation-properties-ni07-xcoxzn03fe2o4-thick-films-0