Magnetic properties of mesoporous cobalt–silica–alumina ternary mixed oxides

2013 ◽  
Vol 198 ◽  
pp. 114-119 ◽  
Author(s):  
Nabanita Pal ◽  
Md. Motin Seikh ◽  
Asim Bhaumik
Keyword(s):  
Magnetic Properties ◽  
Mixed Oxides ◽  
Silica Alumina

Electrochemical Synthesis of New Magnetic Mixed Oxides of Sr and Fe:  Composition, Magnetic Properties, and Microstructure

2000 ◽  
Vol 12 (2) ◽  
pp. 573-579 ◽  
Author(s):  
R. Amigó ◽  
J. Asenjo ◽  
E. Krotenko ◽  
F. Torres ◽  
J. Tejada ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Electrochemical Synthesis ◽  
Mixed Oxides

209Bi NQR and Magnetic Properties of Bismuth Oxide-Based Compounds

1998 ◽  
Vol 53 (6-7) ◽  
pp. 504-513 ◽  
Author(s):  
E. A. Kravchenko ◽  
V. G. Orlov ◽  
Suan Hai Fam ◽  
Yu. F. Kargin
Keyword(s):  
Computer Simulation ◽  
Magnetic Properties ◽  
Magnetic Fields ◽  
Spin System ◽  
Mixed Oxides ◽  
Mutual Orientation ◽  
Line Shapes ◽  
Weak Magnetic Fields ◽  
Notable Increase ◽  
Nuclear Spin System

Abstract The NQR line shapes of 209Bi in the α-Bi2O3-based mixed oxides Bi2O3 • 2M2O3 (M = Al, Ga). Bi2O3 • 3GeO2, and 2Bi2O3 • 3GeO2 are recorded in zero and weak magnetic fields (Hext < 500 Oe) and compared with the results of computer simulation. Splittings and line shape asymmetry, exhibited by the resonances, suggest that internal magnetic fields, similar to those earlier reported for α-Bi2O3 and Bi3O4Br, may exist in these compounds.In the spectra of single crystal Bi4Ge3O12, the line multiplicity in external magnetic fields is higher than simulated, which might results from domains in the crystal.In external magnetic fields a notable increase in the line intensity was observed, the effect depending on the mutual orientation of the EFG axes and the fields perturbing the nuclear spin system.

scholarly journals Influence of Zn/Fe Molar Ratio on Optical and Magnetic Properties of ZnO and ZnFe2O4Nanocrystal as Calcined Products of Layered Double Hydroxides

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Abdullah Ahmed Ali Ahmed ◽  
Zainal Abidin Talib ◽  
Mohd Zobir Hussein ◽  
Moayad Husein Flaifel ◽  
Naif Mohammed Al-Hada
Keyword(s):  
Magnetic Properties ◽  
Near Infrared ◽  
Mixed Oxides ◽  
Diffuse Reflectance Spectroscopy ◽  
Molar Ratio ◽  
Nanometer Scale ◽  
X Ray Diffraction ◽  
Molar Ratios ◽  
Double Hydroxide ◽  
Double Hydroxides

The coprecipitation method has been used to synthesize layered double hydroxide (Zn-Fe-LDH) nanostructure at different Zn2+/Fe3+molar ratios. The structural properties of samples were studied using powder X-ray diffraction (PXRD). LDH samples were calcined at 600°C to produce mixed oxides (ZnO and ZnFe2O4). The crystallite size of mixed oxide was found in the nanometer scale (18.1 nm for ZnFe2O4and 43.3 nm for ZnO). The photocatalytic activity of the calcination products was investigated using ultraviolet-visible-near infrared (UV-VIS-NIR) diffuse reflectance spectroscopy. The magnetic properties of calcined LDHs were investigated using a vibrating sample magnetometer (VSM). The calcined samples showed a paramagnetic behavior for all Zn2+/Fe3+molar ratios. The effect of molar ratio on magnetic susceptibility of the calcined samples was also studied.

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