Crystallite size effect in the selective oxidation of butene to butadiene on iron oxide. 1. Moessbauer, x-ray and magnetization characterization of the catalysts

1984 ◽  
Vol 88 (12) ◽  
pp. 2525-2530 ◽  
Author(s):  
F. Hong ◽  
B. L. Yang ◽  
L. H. Schwartz ◽  
H. H. Kung
Keyword(s):  
Iron Oxide ◽  
Size Effect ◽  
Crystallite Size ◽  
Selective Oxidation ◽  
X Ray

scholarly journals Production and characterization of iron-chromium-zinc pigment based ceramic stain colour of red-brown shade

2013 ◽  
Vol 48 (3) ◽  
pp. 213-216 ◽  
Author(s):  
S Parveen ◽  
SA Jahan ◽  
S Ahmed
Keyword(s):  
Zinc Oxide ◽  
Iron Oxide ◽  
Chemical Durability ◽  
X Ray Diffraction ◽  
X Ray ◽  
Exposure Limit ◽  
Substitute Material ◽  
Pure Chromium ◽  
Iron Chromium

Considering the demand of ceramic stain colours in Bangladesh, an attempt has been taken to develop iron-chromium-zinc pigment based ceramic stain colour of red-brown shade which could be used as an import substitute material in the local ceramic industries. The desired shade of red-brown stain was synthesized from an equimolar mixture of pure chromium oxide (Cr2O3), iron oxide (Fe2O3) and zinc oxide (ZnO). The developed stain was characterized by X-ray diffraction (XRD) technique. The characteristic of the stain complied with the chemical durability. Moreover, chromium leaching was below the permissible exposure limit which makes it as a promising ceramic stain to be used in our ceramic industries. DOI: http://dx.doi.org/10.3329/bjsir.v48i3.17334 Bangladesh J. Sci. Ind. Res. 48(3), 213-216, 2013

Preparation and characterization of iron oxide pillared montmorillonite

Clay Minerals ◽  
1988 ◽  
Vol 23 (4) ◽  
pp. 367-377 ◽  
Author(s):  
D. H. Doff ◽  
N. H. J. Gangas ◽  
J. E. M. Allan ◽  
J. M. D. Coey
Keyword(s):  
Magnetic Properties ◽  
Iron Oxide ◽  
Powder Diffraction ◽  
Mössbauer Spectra ◽  
Pillared Clay ◽  
Cross Linking ◽  
X Ray ◽  
Pillared Montmorillonite ◽  
Mossbauer Spectra

AbstractPillared smectites in which the pillars consist of iron oxide are expected to have interesting and unusual magnetic properties. Several possible routes by which such materials might be made have been investigated, namely intercalation of hydroxy-Fe(III) polycations, mixed hydroxy-Fe(III)/Al polycations, phenanthroline-Fe(II) cations, and trinuclear Fe(III) acetato cations into Na-montmorillonite. Only the last of these yielded a pillared clay (PILC) on calcination. The products have been characterized using X-ray powder diffraction and 57Fe Mössbauer spectroscopy. The precursor Fe-PILC has a d-spacing of 21 Å and expands to 23 Å on solvation with glycol. The calcined Fe-PILC has a d-spacing of 19 Å (gallery height 9·4 Å) and does not expand with glycol, confirming cross-linking of the layers. From Mössbauer spectra at 4·2 K it is estimated that there are of the order of some hundred Fe atoms per pillar.

Characterization of iron oxide-based pigments by synchrotron-based micro X-ray diffraction

2008 ◽  
Vol 42 (1-2) ◽  
pp. 57-62 ◽  
Author(s):  
L.K. Herrera ◽  
M. Cotte ◽  
M.C. Jimenez de Haro ◽  
A. Duran ◽  
A. Justo ◽  
...  
Keyword(s):  
Iron Oxide ◽  
X Ray Diffraction ◽  
X Ray

X-Ray Powder Diffraction Characterization of Residual Stresses and Strains in Y3Al5O12:Nd3+ Nanoceramics

2008 ◽  
Vol 571-572 ◽  
pp. 303-308
Author(s):  
Robert Fedyk ◽  
Jorma Hölsä ◽  
Dariusz Hreniak ◽  
Mika Lastusaari ◽  
Vesa Pekka Lehto ◽  
...  
Keyword(s):  
Residual Stresses ◽  
Crystallite Size ◽  
Powder Diffraction ◽  
Average Crystallite Size ◽  
Luminescence Decay ◽  
The Other ◽  
X Ray ◽  
Decay Times ◽  
Residual Stresses And Strains

Y3Al5O12:Nd3+ nanoceramics were obtained by sintering nanocrystalline Y3Al5O12:Nd3+ powders at 450 oC under different pressures between 2 and 8 GPa. The structural purity, residual stress, strain, texture, and crystallite size of the products were analysed with X-ray powder diffraction. The results indicate that the average crystallite size remains unchanged at about 30 nm in spite of the heating and the pressure applied. No texture was observed. On the other hand, the microstrains increase with increasing pressure, while the residual stresses are at their maximum in the green body and the sample processed at 8 GPa. Increasing strains were observed to increase the width of the luminescence lines and to decrease the luminescence decay times.

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