The abiotic reductive removal and subsequent incorporation of Tc(iv) into iron oxides: a frontier review

2019 ◽  
Vol 6 (12) ◽  
pp. 3492-3500 ◽  
Author(s):  
Daria Boglaienko ◽  
Tatiana G. Levitskaia
Keyword(s):  
Crystal Structure ◽  
Iron Oxides ◽  
Exafs Analysis ◽  
Subsequent Incorporation

This article reviews the mechanism of Tc incorporation into the crystal structure of magnetite and provides comparative EXAFS analysis.

scholarly journals Discovery of Fe7O9: a new iron oxide with a complex monoclinic structure

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Ryosuke Sinmyo ◽  
Elena Bykova ◽  
Sergey V. Ovsyannikov ◽  
Catherine McCammon ◽  
Ilya Kupenko ◽  
...  
Keyword(s):  
Applied Sciences ◽  
Crystal Structure ◽  
Iron Oxide ◽  
Iron Oxides ◽  
Industrial Applications ◽  
Ambient Conditions ◽  
X Ray Diffraction ◽  
X Ray ◽  
High Pressure High Temperature ◽  
Insight Into

Abstract Iron oxides are fundamentally important compounds for basic and applied sciences as well as in numerous industrial applications. In this work we report the synthesis and investigation of a new binary iron oxide with the hitherto unknown stoichiometry of Fe7O9. This new oxide was synthesized at high-pressure high-temperature (HP-HT) conditions, and its black single crystals were successfully recovered at ambient conditions. By means of single crystal X-ray diffraction we determined that Fe7O9 adopts a monoclinic C2/m lattice with the most distorted crystal structure among the binary iron oxides known to date. The synthesis of Fe7O9 opens a new portal to exotic iron-rich (M,Fe)7O9 oxides with unusual stoichiometry and distorted crystal structures. Moreover, the crystal structure and phase relations of such new iron oxide groups may provide new insight into the cycling of volatiles in the Earth’s interior.

Facile crystal-structure-controlled synthesis of iron oxides for adsorbents and anode materials of lithium batteries

2016 ◽  
Vol 170 ◽  
pp. 239-245 ◽  
Author(s):  
Yao Luo ◽  
Lihu Liu ◽  
Wencan Qiao ◽  
Fan Liu ◽  
Yashan Zhang ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Iron Oxides ◽  
Lithium Batteries ◽  
Anode Materials ◽  
Controlled Synthesis

Tritium exchange studies on metal oxide colloidal dispersions

1977 ◽  
Vol 30 (8) ◽  
pp. 1655 ◽  
Author(s):  
DE Yates ◽  
F Grieser ◽  
R Cooper ◽  
TW Healy
Keyword(s):  
Crystal Structure ◽  
Heat Treatment ◽  
Iron Oxide ◽  
Metal Oxide ◽  
Iron Oxides ◽  
Colloidal Dispersions ◽  
Water Interface ◽  
Amorphous Iron ◽  
Tio2 Rutile ◽  
Exchange Technique

The tritium exchange technique has been used to detemine the maximum number of surface protons at the oxide-water interface for oxide colloids including silicas, TiO2 (rutile) and the iron oxides goethite, hematite and amorphous iron oxide. The effects of heat treatment, crystal structure and exchange conditions are considered and tritium exchange values for the number of surface protons are compared with values calculated from crystal structures.

One-Pot Synthesis of Iron Oxides-Doped Carbon Microspheres Composites

2018 ◽  
Vol 932 ◽  
pp. 76-80
Author(s):  
Xiao Hui Guo ◽  
Hui Min Yang ◽  
Gui Bao Guo
Keyword(s):  
Crystal Structure ◽  
Iron Oxides ◽  
High Performance ◽  
Dye Wastewater ◽  
Carbon Microspheres ◽  
Concentration Increase ◽  
Sem Images ◽  
One Pot ◽  
Properties Of Materials ◽  
Hydrothermal Methods

Iron oxides-doped carbon microspheres composites were synthesized by one-pot hydrothermal methods using Fe (NO3)3·9H2O as the iron source and glucose as the carbon source. The morphology, particle size and crystal structure can be controlled flexibly by altering the concentration of ferric salts and glucose. The SEM and XRD were used to characterize the physicochemical properties of materials. The SEM images indicated that the composites were microspheres, and as the salts concentration increase, adhesion occurred between microspheres. The XRD results showed that the composites were composed of Fe3O4 and amorphous carbon. The materials were applied to photocatalytic degradation of dye wastewater and possessed high performance.

Synthesis, crystal structure and magnetic properties of iron oxides nanoparticles for biomedical applications

2010 ◽  
Vol 3 (3) ◽  
pp. 220 ◽  
Author(s):  
S. Rashdan ◽  
M. Bououdina ◽  
A. Al Saie ◽  
E. Ghanem ◽  
A. Bin Thani ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
Iron Oxides ◽  
Biomedical Applications

Iron oxides with a reverse spinel structure: impact of active sites on molecule adsorption

2019 ◽  
Vol 6 (10) ◽  
pp. 2810-2816 ◽  
Author(s):  
Wei Jian ◽  
Ran Jia ◽  
Jian Wang ◽  
Hong-Xing Zhang ◽  
Fu-Quan Bai
Keyword(s):  
Crystal Structure ◽  
Iron Oxides ◽  
Spinel Structure ◽  
Active Sites ◽  
Molecule Adsorption ◽  
Catalytically Active

Fe3O4 and γ-Fe2O3 with the same crystal structure reflect different catalytically active sites leading to different catalyst properties.

scholarly journals Influence of Anion Coexistence on Crystal Structure of Iron Oxides Deposited from Steel Surfaces

2008 ◽  
Vol 6 ◽  
pp. 60-63
Author(s):  
Kozo Shinoda ◽  
Sang-Koo Kwon ◽  
Shigeru Suzuki ◽  
Yoshio Waseda
Keyword(s):  
Crystal Structure ◽  
Iron Oxides ◽  
Steel Surfaces

Crystal Structure Determination of Glycerol-Containing Lipids from Electron Diffraction Data. Use of Analog Compounds Based upon Configurational Isomers of Cyclopentane-1, 2, 3-TRIOL

1977 ◽  
Vol 35 ◽  
pp. 24-25
Author(s):  
Douglas L. Dorset ◽  
Anthony J. Hancock
Keyword(s):  
Crystal Structure ◽  
Electron Diffraction ◽  
Diffraction Data ◽  
Structure Determination ◽  
Crystal Surface ◽  
Coherent Scattering ◽  
Crystal Structure Determination ◽  
Electron Diffraction Data ◽  
Polar Group ◽  
Axis Orientation

Lipids containing long polymethylene chains were among the first compounds subjected to electron diffraction structure analysis. It was only recently realized, however, that various distortions of thin lipid microcrystal plates, e.g. bends, polar group and methyl end plane disorders, etc. (1-3), restrict coherent scattering to the methylene subcell alone, particularly if undistorted molecular layers have well-defined end planes. Thus, ab initio crystal structure determination on a given single uncharacterized natural lipid using electron diffraction data can only hope to identify the subcell packing and the chain axis orientation with respect to the crystal surface. In lipids based on glycerol, for example, conformations of long chains and polar groups about the C-C bonds of this moiety still would remain unknown.One possible means of surmounting this difficulty is to investigate structural analogs of the material of interest in conjunction with the natural compound itself. Suitable analogs to the glycerol lipids are compounds based on the three configurational isomers of cyclopentane-1,2,3-triol shown in Fig. 1, in which three rotameric forms of the natural glycerol derivatives are fixed by the ring structure (4-7).

Spherulitic crystal growth in the prodissoconch larval of Crassostrea virginica

1983 ◽  
Vol 41 ◽  
pp. 518-519
Author(s):  
George G. Cocks ◽  
Louis Leibovitz ◽  
DoSuk D. Lee
Keyword(s):  
Crystal Structure ◽  
Crassostrea Virginica ◽  
Crystal Orientation ◽  
Developmental Changes ◽  
Gastrula Stage ◽  
Orthorhombic Crystal ◽  
Orthorhombic Crystal Structure ◽  
Stages Of Growth ◽  
Early Stages ◽  
Initial Deposition

Our understanding of the structure and the formation of inorganic minerals in the bivalve shells has been considerably advanced by the use of electron microscope. However, very little is known about the ultrastructure of valves in the larval stage of the oysters. The present study examines the developmental changes which occur between the time of conception to the early stages of Dissoconch in the Crassostrea virginica(Gmelin), focusing on the initial deposition of inorganic crystals by the oysters.The spawning was induced by elevating the temperature of the seawater where the adult oysters were conditioned. The eggs and sperm were collected separately, then immediately mixed for the fertilizations to occur. Fertilized animals were kept in the incubator where various stages of development were stopped and observed. The detailed analysis of the early stages of growth showed that CaCO3 crystals(aragonite), with orthorhombic crystal structure, are deposited as early as gastrula stage(Figuresla-b). The next stage in development, the prodissoconch, revealed that the crystal orientation is in the form of spherulites.

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