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Browsing by Author "Upadhyay, C."

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Appearance of superparamagnetism on heating nanosize Mn0.65Zn0.35Fe2O4

Rath, C.; Mishra, N.C.; Anand, S.; Das, R.P.; Sahu, K.K.; Upadhyay, C.; Verma, H.C. (Applied Physics Letters, 76(4), 2000: 475-477)

Nanosize particles (average size similar to 12 nm) of mixed ferrite Mn0.65Zn0.35Fe2O4 were prepared by the hydrothermal precipitation route and studied using x-ray diffraction, transmission electron microscopy, differential ...
Aqueous reduction of crystalline goethite under ammoniacal conditions

Mohapatra, M.; Anand, S.; Das, R.P.; Upadhyay, C.; Verma, H.C. (Hydrometallurgy, 65(2-3), 2002: 227-235)

Pure crystalline goethite was laboratory-prepared and its reduction under various experimental conditions was studied. Both goethite and the reduced products obtained by the action of ammonium sulphite and/or ferrous ...
Cation distribution in nanosized Ni-Zn ferrites

Upadhyay, C.; Verma, H.C.; Anand, S. (Journal Of Applied Physics, 95(10), 2004: 5746-5751)

Nanoparticles of Ni1-xZnxFe2O4 (x=0.0, 0.25, 0.50, 0.75, and 1.0) in the size range of 6-12 nm have been synthesized by chemical precipitation followed by hydrothermal treatment. A strong correlation between the particle ...
Effect of addition of Cu(II), Ni(II) and Co(II) ions on conversion of crystalline geothite to magnetite in NH3-FeSO4-H2O medium (vol 69, pg 75, 2003)

Mohapatra, M.; Anand, S.; Das, R.P.; Upadhyay, C.; Verma, H.C. (International Journal Of Mineral Processing, 75(1-2), 2005: 145-146)
Effect of addition of Cu(II), Ni(II) and Co(II) ions on conversion of crystalline goethite to magnetite in NH3-FeSO4-H2O medium

Mohapatra, M.; Anand, S.; Das, R.P.; Upadhyay, C.; Verma, H.C. (International Journal Of Mineral Processing, 69(1-4), 2003: 75-86)

Conversion of crystalline goethite to magnetite was carried out in the presence of Cu(II), Ni(II) or Co(II) ions in NH3-Fe(II)-H2O medium. The conditions used were: temperature 403 K, ammonia 25 g l(-1), time 2 h, ferrous ...
Effect of Ni doping on the properties of fine magnetite particles

Mohapatra, M.; Pandey, B.; Upadhyay, C.; Anand, S.; Das, R.P.; Verma, H.C. (Journal Of Magnetism And Magnetic Materials, 295(1), 2005: 44-50)

Vibrating sample magnetometer (VSM) and Mossbauer spectroscopy are used to characterize the magnetic behaviour of fine magnetite particles obtained from (i) pure goethite and (ii) Ni-doped goethite, in ammoniacal solution. ...
Effect of preparation conditions on formation of nanophase Ni-Zn ferrites through hydrothermal technique

Upadhyay, C.; Mishra, D.; Verma, H.C.; Anand, S.; Das, R.P. (Journal Of Magnetism And Magnetic Materials, 260(1-2), 2003: 188-194)

Nanophase Ni1-xZnxFe2O4 (x = 0, 0.5, 1.0) samples were prepared by chemically precipitating hydroxides followed by hydrothermal processing. The products were characterized by X-ray diffraction and Mossbauer spectroscopy. ...
Mossbauer studies of nanosize Mn1-xZnxFe2O4

Upadhyay, C.; Verma, H.C.; Rath, C.; Sahu, K.K.; Anand, S.; Das, R.P.; Mishra, N.C. (Journal Of Alloys And Compounds, 326(1-2), 2001: 94-97)

Nanosized mixed ferrite Mn1-xZnFe2O4 (x = 0.0, 0.35, 0.5, 0.65, 1) has been prepared by hydrothermal route at pH 9 and 210 degreesC and studied by X-ray diffraction, magnetization measurement and Mossbauer spectroscopy. ...
Preparation and characterization of Cu(II), Ni(II) or Co(II) ion-doped goethite samples and their conversion to magnetite in NH3-FeSO4-H2O medium

Mohapatra, M.; Anand, S.; Das, R.P.; Upadhyay, C.; Verma, H.C. (Hydrometallurgy, 66(1-3), 2002: 125-134)

Crystalline goethite samples doped with Cu(II), Ni(II) and Co(II) ions were prepared by a coprecipitation method using ferric nitrate, sodium hydroxide and metal ion salt solutions. These samples were characterized by XRD ...

Browsing by Author "Upadhyay, C."

Browsing by Author "Upadhyay, C."

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