01967nas a2200241   4500008004100000022001400041245008400055210006900139260006900208300001200277490000800289520111400297653001301411653001501424653005501439100002001494700001901514700002001533700001801553700001701571700002201588856011501610       2009                        eng d  a0925-838800aGas sensing properties of magnesium ferrite prepared by co-precipitation method0 aGas sensing properties of magnesium ferrite prepared by coprecip  aPO BOX 564, 1001 LAUSANNE, SWITZERLANDbELSEVIER SCIENCE SAcNOV  a270-2720 v4883 a<p>Polycrystalline magnesium ferrite (MgFe(2)O(4)) was prepared by the co-precipitation method. The synthesized compound was characterized for their phase and morphology by X-ray diffraction and scanning electron microscopy, respectively. Conductance responses of the (MgFe(2)O(4)) were measured towards gases like hydrogen sulfide (H(2)S), liquefied petroleum gas (LPG), ethanol vapors (C(2)H(5)OH), SO(x), H(2), NO(x), NH(3), methanol, acetone and petrol. The gas sensing characterstics were obtained by measuring the sensitivity as a function of various controlling factors like operating temperatures and concentrations of gases. It was found that the sensor exhibited various responses towards these gases at different operating temperatures. Furthermore; the MgFe(2)O(4) based sensor exhibited a fast response and a good recovery towards petrol at temperature 250 degrees C. The results of the response towards petrol reveal that (MgFe(2)O(4)) synthesized by a simple co-precipitation method, would be a suitable material for the fabrication of the petrol sensor. (C) 2009 Published by Elsevier B.V.</p>10aFerrites10aGas sensor10aX-ray diffraction and scanning electron microscopy1 aHankare, P., P.1 aJadhav, S., D.1 aSankpal, U., B.1 aPatil, R., P.1 aSasikala, R.1 aMulla, Imtiaz, S.  uhttps://library.ncl.res.in/content/gas-sensing-properties-magnesium-ferrite-prepared-co-precipitation-method-001883nas a2200265   4500008004100000022001400041245009000055210006900145260007300214300001400287490000800301520096900309653002401278653001201302653001801314653002201332100002001354700001801374700002001392700001901412700002201431700001901453700002101472856012401493       2009                        eng d  a0304-885300aMagnetic and dielectric properties of nanophase manganese-substituted lithium ferrite0 aMagnetic and dielectric properties of nanophase manganesesubstit  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcOCT  a3270-32730 v3213 a<p>Nanocrystalline manganese-substituted lithium ferrites viz. Li0.5Fe2.5-xMnxO4 (2.5 &lt;= x &gt;= 0) were prepared by sol-gel autocombustion method. X-ray diffraction analysis confirmed that as the concentration of manganese increases the cubic phase changes to the tetragonal phase. The variation of saturation magnetization was studied as a function of manganese content. All the compositions indicate that they are ferrimagnetic in nature. The dielectric constant, dielectric loss tangent and ac conductivity of all samples were measured at room temperature as a function of frequency. These parameters decrease with increase in frequency for all of the samples. The substitution of manganese plays an important role in changing the structural and magnetic properties of these ferrites. The compositional variation of dielectric constant and d.c. resistivity shows an inverse trend of variation with each other. (C) 2009 Elsevier B.V. All rights reserved.</p>10adielectric constant10aFerrite10aMagnetization10aX-ray diffraction1 aHankare, P., P.1 aPatil, R., P.1 aSankpal, U., B.1 aJadhav, S., D.1 aMulla, Imtiaz, S.1 aJadhav, K., M.1 aChougule, B., K.  uhttps://library.ncl.res.in/content/magnetic-and-dielectric-properties-nanophase-manganese-substituted-lithium-ferrite-001985nas a2200265   4500008004100000022001400041245014300055210006900198260006900267300001200336490000800348520101100356653002301367653001301390653001001403653003301413653002201446100002001468700001901488700002001507700002401527700002101551700002101572856012601593       2009                        eng d  a0925-838800aSynthesis, characterization and effect of sintering temperature on magnetic properties of MgNi ferrite prepared by co-precipitation method0 aSynthesis characterization and effect of sintering temperature o  aPO BOX 564, 1001 LAUSANNE, SWITZERLANDbELSEVIER SCIENCE SAcMAY  a926-9290 v4753 a<p>Mixed MgNi ferrites with composition Mg(0.5)Ni(0.5)Fe(2)O(4) where the mole fraction for Ni (x = 0, 0.25, 0.75, 0.5 and 1) were prepared by following co-precipitation method at temperature 110 degrees C and maintaining a pH of solution equal to 9.5 enable to achieve large particle surface area. The resultant materials obtained in powder form were sintered at different temperatures. Thermogravimetry (TGA), X-ray diffraction (XRD) and scanning electron microscopy, technique were applied to obtain structural parameters. The XRD patterns reveal the presence of(311) peak as the most intense one. The intensity of XRD peak increases with increase in sintering temperature. The saturation magnetization values showed increasing trend with increase in sintering temperature from 2.37 to 29.76 emu/g. These results along with the analysis of SEM micrographs are interpreted in terms of increase in particle grain size with increase in sintering temperature. (C) 2008 Elsevier B.V. All rights reserved.</p>10aChemical synthesis10aFerrites10aFT-IR10ascanning electron microscopy10aX-ray diffraction1 aHankare, P., P.1 aJadhav, S., D.1 aSankpal, U., B.1 aChavan, Santosh, S.1 aWaghmare, K., J.1 aChougule, B., K.  uhttps://library.ncl.res.in/content/synthesis-characterization-and-effect-sintering-temperature-magnetic-properties-mgni-0