02099nas a2200265   4500008004100000022001400041245009500055210006900150260006900219300001400288490000800302520117200310653002201482653002601504653001801530653002901548653000801577100002201585700002201607700001801629700002201647700002101669700001601690856012701706       2011                        eng d  a0925-838800aMagnetic properties of thermal plasma synthesized nanocrystalline nickel ferrite (NiFe2O4)0 aMagnetic properties of thermal plasma synthesized nanocrystallin  aPO BOX 564, 1001 LAUSANNE, SWITZERLANDbELSEVIER SCIENCE SAcMAR  a4404-44130 v5093 a<p>A rapid synthesis method is reported for magnetic nanoparticles of nickel ferrite involving thermal plasma assisted vapor phase condensation process. The as-synthesized samples were characterized by X-ray Diffraction, Transmission Electron Microscopy, Vibrating Sample Magnetometer and X-ray Photoelectron Spectroscopy techniques. The average particle size was determined from the TEM micrographs and found to be around 30 nm. The effects of reactor parameters on the magnetic and structural properties have been evaluated, to find the optimized parameters so as to achieve the highest values of saturation magnetization and coercivity. Reasonably high saturation magnetization (48 emu/g) has been assigned to the high degree of crystallinity, achieved on account of high temperature during the growth, and the cation redistribution. The high value of coercivity (1150e) is explained on the basis of possible lattice defects arising from the cation redistribution. Detailed analysis of cation distribution using the XRD line intensity data leads to the conclusion that these samples are iron deficit and nickel rich. (C) 2011 Elsevier B.V. All rights reserved.</p>10acrystal structure10aMagnetic measurements10aMagnetization10aNanostructured materials10aTEM1 aNawale, Ashok, B.1 aKanhe, Nilesh, S.1 aPatil, K., R.1 aBhoraskar, S., V.1 aMathe, Vikas, L.1 aDas, A., K.  uhttps://library.ncl.res.in/content/magnetic-properties-thermal-plasma-synthesized-nanocrystalline-nickel-ferrite-nife2o4-002357nas a2200241   4500008004100000022001400041245010200055210006900157260006900226300001200295490000800307520148900315653002301804653003001827653002001857653003301877653000801910100001901918700002001937700001801957700001801975856012201993       2014                        eng d  a0925-400500aHumidity-sensing studies of cerium oxide nanoparticles synthesizedby non-isothermal precipitation0 aHumiditysensing studies of cerium oxide nanoparticles synthesize  aPO BOX 564, 1001 LAUSANNE, SWITZERLANDbELSEVIER SCIENCE SAcNOV  a229-2380 v2033 a<p>We report the fabrication of a highly sensitive and fast humidity sensor based on cerium oxide (CeO2) nanoparticles, which were prepared at low cost via a simple non-isothermal precipitation method. The asprepared CeO2 nanoparticles were characterized by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy( TEM) and the results indicated the formation of face centered cubic phase of CeO2 with average crystallite size of approximately 10-12 nm. Humidity sensors based on CeO2 nanoparticles exhibit high and linear response within the whole relative humidity (RH) range of 11-97% at an operating frequency of 60 Hz. The corresponding impedance changes by approximately three orders of magnitude within the entire humidity range from 11% to 97% RH. The response and recovery times are about 2-3 and 9-10 s, respectively, when RH was switched between 11% and 97%. Furthermore, the sensors also show relatively small hysteresis, excellent reproducibility, long term stability and broad range of operation (11-97% RH). The complex impedance spectra of the sensor at different RHs and the equivalent circuit were analyzed to explore the humidity-sensing mechanism. This study demonstrates that the CeO2 nanoparticles prepared by non-precipitation method can be used as the humidity-sensing material for the fabrication of humidity sensors. (C) 2014 Elsevier B. V. All rights reserved.</p>10aCeO2 nanoparticles10aComplex impedance spectra10ahumidity sensor10aNon-isothermal precipitation10aTEM1 aKhadse, V., R.1 aThakur, Sharada1 aPatil, K., R.1 aPatil, Pradip  uhttps://library.ncl.res.in/content/humidity-sensing-studies-cerium-oxide-nanoparticles-synthesizedby-non-isothermal-0