A novel synthesis method for TiO2 particles with magnetic Fe3O4 cores

2014 ◽  
Vol 69 (10) ◽  
pp. 2093-2098 ◽  
Author(s):  
Qi Dong ◽  
Keqiang Zhang ◽  
Yi An
Keyword(s):  
Crystal Structure ◽  
Removal Rate ◽  
Synthesis Method ◽  
Initial Concentration ◽  
X Ray ◽  
Tio2 Particles ◽  
Novel Synthesis ◽  
Wide Range ◽  
Magnetic Recovery ◽  
Magnetic Fe3o4

TiO2@(AC/Fe3O4) (AC is activated carbon) was prepared by using AC and Fe3O4 as joint support. The morphological features, crystal structure, and magnetism of the final product were characterized. The results indicate that TiO2 particles formed on the surface of AC and Fe3O4; the sizes of TiO2 and Fe3O4 were 0.5 and 0.7 μm respectively, and that of AC fell within a wide range. The highly crystalline cubic structures of the TiO2 particles was in accord with the standard X-ray diffractometry spectrum of magnetite and anatase. The maximum saturation magnetization of TiO2@(AC/Fe3O4) was 75 emu g−1, which was enough to support magnetic recovery. The rate of methylene blue (MB) removal photocatalyzed by TiO2@(AC/Fe3O4) was higher by 50% than that achieved with AC/Fe3O4 photocatalysis, and similar to that achieved with TiO2@AC. The removal rate (kobs) decreased drastically from 1.77 × 10−2 to 9.36 × 10−3min−1 when the initial concentration of MB solution increased from 2.0 to 5.0 mg L−1. The kobs value increased from 9.41 × 10−3 to 1.34 × 10−2min−1 with increasing photocatalyst dosage from 0.2 to 1.0 g, then slightly decreased to 1.33 × 10−2min−1 at 2.0 g dosage.

Synthesis and crystal-structure determination of fibrillar methylammonium trimolybdate hydrate

2007 ◽  
Vol 22 (3) ◽  
pp. 241-245 ◽  
Author(s):  
B. Włodarczyk-Gajda ◽  
A. Rafalska-Łasocha ◽  
W. Łasocha
Keyword(s):  
Crystal Structure ◽  
Powder Diffraction ◽  
Rietveld Method ◽  
Synthesis Method ◽  
Diffraction Method ◽  
Orthorhombic Space Group ◽  
Synthesis And Crystal Structure ◽  
X Ray ◽  
Novel Synthesis

A novel synthesis method of fibrillar trimolybdates with the use of Ag2Mo3O10∙2H2O as a precursor has been used successfully to synthesize methylammonium trimolybdate, (CH3NH3)2Mo3O10∙H2O. The crystal structure of this compound was determined by X-ray powder diffraction method and refined by the Rietveld method. The compound is orthorhombic, space group Pnma (62), with a=11.241(3), b=7.585(1), and c=15.516(4) Å. The redetermined crystal structure of the precursor and the structure of the title compound are compared and discussed.

The Influence of the Synthesis Method on the Formation of Phase Composition and Catalytic Centers Gd2Zr2O7

2020 ◽  
Vol 1009 ◽  
pp. 69-74
Author(s):  
Ekaterina Borisovna Markova ◽  
Alexander Genrihovich Cherednichenko ◽  
V.V. Kurilkin ◽  
J.M. Serov
Keyword(s):  
Crystal Structure ◽  
Synthesis Method ◽  
Nanocrystalline Powders ◽  
Face Centered Cubic ◽  
Cubic Crystal ◽  
Wide Range ◽  
Physicochemical Methods ◽  
Degradation Reaction ◽  
Cubic Structure ◽  
Face Centered

The influence of the type of crystal structure of complex gadolinium oxides on their catalytic activity was studied using a wide range of physicochemical methods. It was shown that the synthesized nanocrystalline powders Gd2Zr2O7 form highly symmetric face-centered cubic crystal structures. In the course of catalytic experiments, it was found that the formation of a cubic structure increases the degree of conversion of propane and the shift of cracking temperatures to a lower area. The formation of various defects contributes to the course of the dehydrogenation or degradation reaction due to the different number of catalytic centers.

Synthesis, Structural and Dielectric Properties of Pure and Ni Substituted Bismuth Ferrite

2014 ◽  
Vol 938 ◽  
pp. 140-144 ◽  
Author(s):  
S. Blessi ◽  
S. Vijayalakshmi ◽  
S. Pauline
Keyword(s):  
Dielectric Properties ◽  
Hydrothermal Method ◽  
Bismuth Ferrite ◽  
Synthesis Method ◽  
Cost Effective ◽  
Xrd Analysis ◽  
Practical Application ◽  
X Ray ◽  
Wide Range ◽  
Good Agreement

Multiferroics have been known as materials exhibiting both ferroelectric and ferromagnetic properties in same phase, they have interesting physical properties as well as possibility of practical application in some new memories, spintronics and sensor devices. The present work reports the fabrication of pure and Nickel substituted Bismuth Ferrite by simple hydrothermal method at 180oC for 11 hours. The structural study was carried out using X-ray powder diffraction (XRD), and the Dielectric properties were investigated over a wide range of frequency and temperature. The image of SEM is in good agreement with the XRD analysis. The synthesis method is simple and cost effective. KEYWORDS: Multiferroics; Dielectric loss; Hydrothermal method; XRD.

Novel synthesis and crystal structure of Rac-N,N-dimethyl-1-ferrocenylethylamine hydrochloride

2005 ◽  
Vol 2005 (10) ◽  
pp. 651-653
Author(s):  
Yu-Mei Zhang ◽  
Zhi-Ming Zhou ◽  
Cong-Xuan Yu
Keyword(s):  
Crystal Structure ◽  
Title Compound ◽  
Substrate Molecule ◽  
Synthesis And Crystal Structure ◽  
Methyl Group ◽  
X Ray ◽  
Novel Synthesis

The title compound N, N-dimethyl-1-ferrocenylethylaminehydrochloride [Fe(C5H5)(C5H4CHCH3N+H(CH3)2)Cl-] was synthesised by esterification of the corresponding alcohol, followed by substitution with HN(CH3)2 and by extracting HCl from CH2Cl2 probably associated with Fe in the substrate molecule. Its structure was first elucidated by X-ray analysis. By analysis of the crystal structure of, it is proposed that diastereoselective ortho-deprotonation directed by Ugi's amine may be ascribed to the different hindrance exerted by methyl group at chiral C.

scholarly journals Structure Determination of Ho2PdSi3

2014 ◽  
Vol 70 (a1) ◽  
pp. C224-C224
Author(s):  
Melanie Nentwich ◽  
Matthias Zschornak ◽  
Carsten Richter ◽  
Dmitri Novikov ◽  
Dirk Meyer
Keyword(s):  
Crystal Structure ◽  
Experimental Data ◽  
Local Environment ◽  
Ray Method ◽  
X Ray ◽  
Metal Silicides ◽  
Wide Range ◽  
Site Selective ◽  
Palladium Silicide

Holmium-Palladium-Silicide Ho2PdSi3 is a member of rare earth-transition metal silicides exhibiting a wide range of interesting magnetic and electrical properties like multiple transition temperatues. The crystal structure results from HoSi2 by substitution of Si by Pd which is ordering commensurably with a 2 × 2 × 8 superstructure confirmed by a previous XRD and a Diffraction Anomalous Fine Structure (DAFS) measurement of the super structure reflection 1/2 1/2 3/8. DAFS is a X-ray method combining the advantages of absorption and diffraction and hence offers the possibility of element and site selective studies. Thus, it was feasible to probe the local environment of Ho and Pd separately. In the following, we will present a comparison of several structure proposals of Ho2PdSi3 with experimental data from beamline E2 and BW1 of the former synchrotron DORIS III at DESY/HASYLAB.

The crystal structure of polyethylene terephthalate

1954 ◽  
Vol 226 (1167) ◽  
pp. 531-542 ◽  
Keyword(s):  
Crystal Structure ◽  
Polyethylene Terephthalate ◽  
Amorphous Material ◽  
Synthesis Method ◽  
Crystalline Material ◽  
Crystallographic Direction ◽  
Cohesion Energy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Strong Forces

The crystal structure of polyethylene terephthalate (Terylene) has been determined by the interpretation of the X-ray diffraction patterns given by drawn fibres. The unit cell, which contains one chemical unit, —CO.C 6 H 4 .CO.O.(CH 2 ) 2 O—, is triclinic, with a = 4.56Å, b = 5.94 Å, c = 10.75 Å, α = 98 1/2°, β = 118°, γ = 112°. This gives the density of the crystals as 1.455 g/cm 3 . If it is assumed that the density of amorphous regions in partly crystalline material is the same as that of the entirely amorphous material (1.335), the proportion by weight of crystals in ordinary drawn yarn (density 1.39) is 48%, and in specimens of the highest recorded density (1.41) it is 64.5%. These figures are, however, lower limits; if, as is likely, the density of amorphous regions in partly crystalline specimens is lower than 1.335, the proportions of crystalline material are higher than the figures given. The positions of atoms in the crystals have been deduced from the relative intensities of X-ray diffractions; approximate positions were found by trial-and-error methods, and refinement was then effected by calculations of electron densities, using the three-dimensional Fourier synthesis method. The molecules are nearly planar in configuration. Distances between atoms in neighbouring molecules are all normal Van der Waals contact distances; there is therefore no structural evidence for any unusually strong forces between the molecules. This conclusion is in agreement with that based on an estimate of the cohesion energy, which is very nearly the same as that of a comparable aliphatic polyester, polyethylene adipate. The high melting-point of polyethylene terephthalate in comparison with aliphatic polyesters is therefore not due to strong forces between the molecules; it is attributed to the O— ∕ rigidity of the aromatic ring with its attached —C groups. ∖∖ O In most drawn fibres of this polymer, the crystals do not have their c-axes (those parallel to the chain molecules) exactly parallel to the fibre axes; they are tilted in a precisely defined crystallographic direction, such that the 530 plane remains vertical and the inclination of the 001 plane to the fibre axis increases. This is especially well defined in fibres heated to 210° C and allowed to relax, the tilt angle being then about 5°. In principle it is expected that polymer crystals of triclinic symmetry would be tilted, but it is not clear what determines the crystallographic direction of tilt. Tilted crystal X-ray diffraction photographs played an important part in the structure determination.

scholarly journals KxNiy[Fe(CN)6].xH2O Prussian blue analogue: A study of size effect on the structural, optical and magnetic propertiecs

2008 ◽  
Vol 18 (1) ◽  
pp. 43-47 ◽  
Author(s):  
Phung Kim Phu ◽  
Trinh Ngoc Giang ◽  
Nguyen Van Minh
Keyword(s):  
Size Effect ◽  
Prussian Blue ◽  
Magnetic State ◽  
Synthesis Method ◽  
Nano Particles ◽  
X Ray Diffraction ◽  
Prussian Blue Analogue ◽  
X Ray ◽  
Novel Synthesis ◽  
Prussian Blue Analog

Recently, striking effects of light irradiation on the magnetic state were reported for Prussian blue (PB) analogues AxCoy[Fe(CN)6] (A = Na, K, Rb, Cs). The physical and optical properties of these compounds are dependent on the size of the particles of the measured samples. However, there have been few reports on the formation of nano-sized particles of the material and the effect of size of the particles on the properties of the compounds. In this report, we present a novel synthesis method of the KxNiy[Fe(CN)6] PB nano-particles and investigate the effect of particlesize on the properties of the Prussian blue analog KxNiy[Fe(CN)6] by analysising the results of the X-ray diffraction (XRD), scanning electron microscopy (SEM), UV-vis absorption and magnetization measurements of the compounds. Keywords: Prussian Blue, nanoparticle, size effect, magnetic property

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