Structural investigations of gold (Au55) organometallic complexes by x-ray powder diffraction and transmission electron microscopy

1993 ◽  
Vol 97 (45) ◽  
pp. 11611-11616 ◽  
Author(s):  
W. Vogel ◽  
B. Rosner ◽  
B. Tesche
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Powder Diffraction ◽  
Organometallic Complexes ◽  
Structural Investigations ◽  
X Ray ◽  
Transmission Electron

Synthesis and Characterizations of Nanocubes, Monodispersed Nanocrystals and Nanospheres of Au

2007 ◽  
Vol 353-358 ◽  
pp. 2163-2166
Author(s):  
Ming Yang ◽  
Guo Qing Zhou ◽  
Jiang Guo Zhao ◽  
Zhan Jun Li
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Powder Diffraction ◽  
Visible Absorption ◽  
X Ray ◽  
Transmission Electron ◽  
Uv Visible ◽  
Scherrer Formula ◽  
Visible Absorption Spectroscopy

Nanocubes, monodispersed nanocrystals and nanospheres of Au have been prepared by a simple reaction between HAuCl4·4H2O, NaOH and NH2OH·HCl in the presence of gelatin. The role of gelatin and the affection of pH in producing the nanoparticles of Au were discussed. The products were characterized by X-ray powder diffraction, transmission electron microscopy, and UV-visible absorption spectroscopy. The sizes of the monodispersed nanocrystals of Au were estimated by Debye-Scherrer formula according to XRD spectrum.

scholarly journals Crystallite Size Evaluation of ZnO Nanoparticles via Transmission Electron Microscopy and X-ray Powder Diffraction

2016 ◽  
Vol 22 (S3) ◽  
pp. 1610-1611
Author(s):  
Jonathan E. Cowen ◽  
Ashley E. Harris ◽  
Cecelia C. Pena ◽  
Stephen C. Bryant ◽  
Allison J. Christy ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Crystallite Size ◽  
Powder Diffraction ◽  
Zno Nanoparticles ◽  
X Ray ◽  
Transmission Electron ◽  
Size Evaluation

Ultrasonic Synthesis of Ag2Se Nanocrystal in Perrhenate Solution

2014 ◽  
Vol 919-921 ◽  
pp. 2109-2111 ◽  
Author(s):  
Wei Jun Shan ◽  
Qiang Yan ◽  
Du Li ◽  
Da Wei Fang ◽  
Shu Liang Zang
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Powder Diffraction ◽  
Ambient Pressure ◽  
Ion Source ◽  
Metal Chalcogenide ◽  
X Ray ◽  
Ultrasonic Synthesis ◽  
Transmission Electron ◽  
Se Nanoparticles

Ag2Se nanocrystal was successfully prepared by ultrasonic synthesis in water and ethanol systems at an ambient pressure. The powder of selenium was used as the selenium ion source. The size of the nanocrystals is in the scope of 10-20nm. The products were characterized by some means including X-ray Powder Diffraction (XRD) and Transmission Electron Microscopy (TEM) which was used to study the thermostability of the product. The result of the experiments indicated that the concentration of the reactant, the pH of the solution, the react temperature and the surfactant had some important influence on the formation and the size of the Ag2Se nanoparticles. The method we reported here is proved to be a new and an easy way to prepare the nanocrystals of metal chalcogenide.

Multidimensional Disorder in Zeolite IM-18 Revealed by Combining Transmission Electron Microscopy and X-ray Powder Diffraction Analyses

2018 ◽  
Vol 18 (4) ◽  
pp. 2441-2451 ◽  
Author(s):  
Magdalena O. Cichocka ◽  
Yannick Lorgouilloux ◽  
Stef Smeets ◽  
Jie Su ◽  
Wei Wan ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Powder Diffraction ◽  
X Ray ◽  
Transmission Electron

Synthesis Second Assembly of Calcium Carbonate Sphere Chains

2010 ◽  
Vol 12 ◽  
pp. 115-122 ◽  
Author(s):  
Hong Zhen Xie ◽  
Xing Li
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Calcium Carbonate ◽  
Powder Diffraction ◽  
Building Block ◽  
Decomposition Temperature ◽  
X Ray ◽  
Thermogravimetry Analysis ◽  
Separate Spheres ◽  
Transmission Electron

Using simple and efficient celloidin membrane as basic template, and adding polyglycol reagent as assistant template, the calcium carbonate assembly sphere chains were synthesized. The length of chains was 6-8 µm, and the building block spheres were formed by nanoparticles with about 50 nm in diameter. All the products were characterized by transmission electron microscopy, X-ray powder diffraction, thermogravimetry analysis. The decomposition temperature increased by about 30 °C compared with the separate spheres, which may be caused by the bonding power of the spheres in chains. The products of calcium carbonate chains that kept in alcohol for 90d were found to have second-assembly to novel flower-like structures.

scholarly journals Sr2Fe1+xRe1−xO6 double perovskites: magnetoresistance and (magneto)thermopower

2019 ◽  
Vol 55 (42) ◽  
pp. 5878-5881 ◽  
Author(s):  
Antoine Maignan ◽  
Christine Martin ◽  
Oleg Lebedev ◽  
Jonas Sottmann ◽  
Lucie Nataf ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Absorption Spectroscopy ◽  
Powder Diffraction ◽  
Double Perovskites ◽  
X Ray ◽  
Transmission Electron ◽  
X Ray Absorption

Polycrystalline Sr2Fe1+xRe1−xO6 samples have been synthesized, structurally characterized by X-ray powder diffraction, transmission electron microscopy, X-ray absorption spectroscopy, and measurements of their magnetotransport properties were performed.

scholarly journals Structural, microstructural and magnetic characterization of the β-CoTe nanophase synthesized by a novel mechanochemical method

RSC Advances ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 5027-5034
Author(s):  
Marcelo Augusto Malagutti ◽  
Kelli de Fátima Ulbrich ◽  
V. Z. C. Paes ◽  
J. Geshev ◽  
Carlos Eduardo Maduro de Campos
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Powder Diffraction ◽  
Mechanochemical Method ◽  
Magnetic Characterization ◽  
X Ray ◽  
Transmission Electron

This work reports an unprecedented mechanochemistry synthesis of β-CoTe and its systematic characterization through X-ray powder diffraction (XRPD), transmission electron microscopy (TEM), and magnetometry techniques.

scholarly journals The structure of denisovite, a fibrous nanocrystalline polytypic disordered `very complex' silicate, studied by a synergistic multi-disciplinary approach employing methods of electron crystallography and X-ray powder diffraction

IUCrJ ◽  
2017 ◽  
Vol 4 (3) ◽  
pp. 223-242 ◽  
Author(s):  
Ira V. Rozhdestvenskaya ◽  
Enrico Mugnaioli ◽  
Marco Schowalter ◽  
Martin U. Schmidt ◽  
Michael Czank ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Electron Diffraction ◽  
Rietveld Refinement ◽  
Powder Diffraction ◽  
Lattice Parameters ◽  
New Mineral ◽  
Electron Crystallography ◽  
X Ray ◽  
Transmission Electron

Denisovite is a rare mineral occurring as aggregates of fibres typically 200–500 nm diameter. It was confirmed as a new mineral in 1984, but important facts about its chemical formula, lattice parameters, symmetry and structure have remained incompletely known since then. Recently obtained results from studies using microprobe analysis, X-ray powder diffraction (XRPD), electron crystallography, modelling and Rietveld refinement will be reported. The electron crystallography methods include transmission electron microscopy (TEM), selected-area electron diffraction (SAED), high-angle annular dark-field imaging (HAADF), high-resolution transmission electron microscopy (HRTEM), precession electron diffraction (PED) and electron diffraction tomography (EDT). A structural model of denisovite was developed from HAADF images and later completed on the basis of quasi-kinematic EDT data byab initiostructure solution using direct methods and least-squares refinement. The model was confirmed by Rietveld refinement. The lattice parameters area= 31.024 (1),b= 19.554 (1) andc= 7.1441 (5) Å, β = 95.99 (3)°,V= 4310.1 (5) Å3and space groupP12/a1. The structure consists of three topologically distinct dreier silicate chains,viz. two xonotlite-like dreier double chains, [Si6O17]10−, and a tubular loop-branched dreier triple chain, [Si12O30]12−. The silicate chains occur between three walls of edge-sharing (Ca,Na) octahedra. The chains of silicate tetrahedra and the octahedra walls extend parallel to thezaxis and form a layer parallel to (100). Water molecules and K+cations are located at the centre of the tubular silicate chain. The latter also occupy positions close to the centres of eight-membered rings in the silicate chains. The silicate chains are geometrically constrained by neighbouring octahedra walls and present an ambiguity with respect to theirzposition along these walls, with displacements between neighbouring layers being either Δz=c/4 or −c/4. Such behaviour is typical for polytypic sequences and leads to disorder along [100]. In fact, the diffraction pattern does not show any sharp reflections withlodd, but continuous diffuse streaks parallel toa* instead. Only reflections withleven are sharp. The diffuse scattering is caused by (100) nanolamellae separated by stacking faults and twin boundaries. The structure can be described according to the order–disorder (OD) theory as a stacking of layers parallel to (100).

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