X-RAY STUDY OF THE MONOCLINIC MODIFICATION [Cu(NH3)4](ReO4)2 IN 100-410 K RANGE

2016 ◽  
Keyword(s):  
Monoclinic Modification ◽  
X Ray

scholarly journals Influence of α-Bi2O3 chemical prehistory on the morphology of the obtaining basic bismuth succinate

2021 ◽  
Vol 340 ◽  
pp. 01020
Author(s):  
Liubov Afonina ◽  
Evgeniya Timakova
Keyword(s):  
Electron Microscopy ◽  
Particle Size ◽  
Grain Size ◽  
Grain Size Analysis ◽  
Size Analysis ◽  
Medical Applications ◽  
Antibacterial Drug ◽  
Chemical Analyses ◽  
Monoclinic Modification ◽  
X Ray

The antibacterial drug, basic bismuth succinate of the composition Ñ2Í4(ÑÎÎBiO)2 is shown to obtain expediently by the interaction of bismuth oxide α-Bi2O3 with a succinic acid solution. Using the method of electron microscopy the influence of the chemical prehistory of obtaining the precursor, monoclinic modification of α-Bi2O3, on the morphological features of basic bismuth succinate synthesized from it has been investigated. The composition of Ñ2Í4(ÑÎÎBiO)2 was confirmed by the data of X-ray phase and chemical analyses. Based on the data of grain size analysis, the particle size of the obtained samples of basic bismuth succinate was estimated and the conditions for the synthesis of fine-crystalline C2H4(COOBiO)2, which is necessary for medical applications, were selected.

Cryogenic mechanical milling of high density polyethylene

e-Polymers ◽  
2009 ◽  
Vol 9 (1) ◽  
Author(s):  
Ana Paula Cysne Barbosa ◽  
Michael Stranz ◽  
Frank Katzenberg ◽  
Uwe Köster
Keyword(s):  
Mechanical Milling ◽  
Solid Phase ◽  
Polarized Light ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Monoclinic Modification ◽  
X Ray ◽  
Responsible Mechanism ◽  
Solid Phase Transition ◽  
Melting And Crystallization

AbstractHDPE was analyzed after being submitted to cryogenic mechanical milling (CMM) by X-ray diffraction (WAXS), polarized light microscopy and differential scanning calorimetry (DSC). After CMM, besides the known phase transformation of the orthorhombic PE crystals into the monoclinic modification, slight changes in the melting and crystallization behavior as well as an unexpected increase in crystallinity were observed. The observed results can be explained by assuming a solid/solid phase transition as the responsible mechanism.

scholarly journals Preparation of metallic bismuth by reduction of bismuth formates in ethylene glycol medium

2021 ◽  
Vol 340 ◽  
pp. 01014
Author(s):  
Kseniya V. Mishchenko ◽  
Yurii M. Yukhin
Keyword(s):  
Ethylene Glycol ◽  
Gradual Increase ◽  
Spherical Particles ◽  
Metal Powders ◽  
Reaction Products ◽  
Scanning Calorimetry ◽  
Monoclinic Modification ◽  
X Ray ◽  
Transmission Electron ◽  
Metallic Bismuth

Nano -and microcrystalline bismuth metal powders consisting of spherical particles with a size of 150-250 nm were obtained by reducing bismuth formates in an ethylene glycol medium. The phase composition and morphology of the obtained reaction products were studied by X-ray phase and thermal analysis, differential scanning calorimetry, scanning and transmission electron microscopy. Using Uv-vis, it was shown that a bismuth-ethylene glycol complex is formed with an absorption maximum at 249 nm and an extinction coefficient of 5.7×103 (L mol-1 cm-1) in a solution of chloric acid at 23°C. The concentration of bismuth enhances to 0.018 g L-1 in the ethylene glycol medium with a gradual increase in the temperature to 60°C of the reaction mixture. Thermolysis of bismuth glycolate with a composition of Bi2(OCH2CH2O)3 is accompanied by the formation of metallic bismuth at 190°C, which is oxidized to a monoclinic modification of bismuth oxide when the temperature increases in the air.

A monoclinic modification of K3[InCl6]

2006 ◽  
Vol 62 (7) ◽  
pp. i143-i144 ◽  
Author(s):  
Lin Chen ◽  
Bo-Lin Wu ◽  
Xiao-Yi He ◽  
Jin-Xiao Mi
Keyword(s):  
Crystal Structure ◽  
Single Crystal ◽  
Diffraction Data ◽  
Three Dimensional ◽  
Dimensional Structure ◽  
Solvent Evaporation Method ◽  
X Ray Diffraction ◽  
Monoclinic Modification ◽  
X Ray ◽  
Three Dimensional Structure

The crystal structure of monoclinic tripotassium indium(III) hexachloride, K3[InCl6], obtained by the solvent evaporation method, has been determined from single-crystal X-ray diffraction data. The crystal structure is characterized by isolated [InCl6] octahedra located in the centre of the cell and at the centre of each of the edges of the cell, linked with K+ cations to form a three-dimensional structure.

X-ray diffraction study of the monoclinic modification of [Cu(NH3)4](ReO4)2 in the range 100-410 K

2016 ◽  
Vol 57 (4) ◽  
pp. 725-730
Author(s):  
S. A. Gromilov ◽  
S. P. Khranenko ◽  
D. A. Piryazev ◽  
N. V. Kuratieva
Keyword(s):  
Diffraction Study ◽  
X Ray Diffraction ◽  
Monoclinic Modification ◽  
X Ray

Intermolecular —CH3...O2N— contacts in two polymorphic modifications of (1E)-N'-[(E)-2-cyano-1-(dimethylamino)-2-nitrovinyl]-N,N-dimethylethanimidamide

2003 ◽  
Vol 59 (4) ◽  
pp. 492-497 ◽  
Author(s):  
V. A. Tafeenko ◽  
V. V. Chernyshev ◽  
A. V. Yatsenko ◽  
V. A. Makarov ◽  
E. J. Sonneveld ◽  
...  
Keyword(s):  
Single Crystal ◽  
Powder Diffraction ◽  
Title Compound ◽  
Diffraction Method ◽  
Single Crystal Diffraction ◽  
Monoclinic Modification ◽  
X Ray ◽  
Orthorhombic Modification ◽  
Polymorphic Modifications ◽  
Crystal Modifications

The title compound was synthesized and isolated in two crystal modifications. The structure of the orthorhombic modification was determined by the X-ray powder diffraction method and the structure of the monoclinic modification was determined using the X-ray single-crystal diffraction technique. The molecules in both polymorphs are E,E isomers. Intermolecular H3C...NO2 contacts and their role in the formation of the polymorphic modifications are analyzed.

Space and Time Distribution of Hard X-Ray Emission in a Loop at the Beginning of a Flare

1994 ◽  
Vol 144 ◽  
pp. 275-277
Author(s):  
M. Karlický ◽  
J. C. Hénoux
Keyword(s):  
Time Distribution ◽  
Electron Bombardment ◽  
Spatial Evolution ◽  
Superthermal Electrons ◽  
Flare Loop ◽  
X Ray ◽  
Superthermal Electron ◽  
Flare Loops ◽  
Chromospheric Evaporation ◽  
Temporal And Spatial

AbstractUsing a new ID hybrid model of the electron bombardment in flare loops, we study not only the evolution of densities, plasma velocities and temperatures in the loop, but also the temporal and spatial evolution of hard X-ray emission. In the present paper a continuous bombardment by electrons isotropically accelerated at the top of flare loop with a power-law injection distribution function is considered. The computations include the effects of the return-current that reduces significantly the depth of the chromospheric layer which is evaporated. The present modelling is made with superthermal electron parameters corresponding to the classical resistivity regime for an input energy flux of superthermal electrons of 109erg cm−2s−1. It was found that due to the electron bombardment the two chromospheric evaporation waves are generated at both feet of the loop and they propagate up to the top, where they collide and cause temporary density and hard X-ray enhancements.

Some Problems in Understanding the Solar Corona

1994 ◽  
Vol 144 ◽  
pp. 1-9
Author(s):  
A. H. Gabriel
Keyword(s):  
Solar Corona ◽  
Solar Atmosphere ◽  
Theoretical Modelling ◽  
Total System ◽  
Major Advance ◽  
X Ray ◽  
Proper Perspective ◽  
Space Observations

The development of the physics of the solar atmosphere during the last 50 years has been greatly influenced by the increasing capability of observations made from space. Access to images and spectra of the hotter plasma in the UV, XUV and X-ray regions provided a major advance over the few coronal forbidden lines seen in the visible and enabled the cooler chromospheric and photospheric plasma to be seen in its proper perspective, as part of a total system. In this way space observations have stimulated new and important advances, not only in space but also in ground-based observations and theoretical modelling, so that today we find a well-balanced harmony between the three techniques.

White-Light Coronal Structures: Streamers and CMEs

1994 ◽  
Vol 144 ◽  
pp. 82
Author(s):  
E. Hildner
Keyword(s):  
Emission Line ◽  
Electron Density ◽  
White Light ◽  
Coronal Mass Ejections ◽  
X Rays ◽  
Solar Cycles ◽  
Temperature Function ◽  
X Ray ◽  
Eclipse Observations ◽  
Coronal Structures

AbstractOver the last twenty years, orbiting coronagraphs have vastly increased the amount of observational material for the whitelight corona. Spanning almost two solar cycles, and augmented by ground-based K-coronameter, emission-line, and eclipse observations, these data allow us to assess,inter alia: the typical and atypical behavior of the corona; how the corona evolves on time scales from minutes to a decade; and (in some respects) the relation between photospheric, coronal, and interplanetary features. This talk will review recent results on these three topics. A remark or two will attempt to relate the whitelight corona between 1.5 and 6 R⊙to the corona seen at lower altitudes in soft X-rays (e.g., with Yohkoh). The whitelight emission depends only on integrated electron density independent of temperature, whereas the soft X-ray emission depends upon the integral of electron density squared times a temperature function. The properties of coronal mass ejections (CMEs) will be reviewed briefly and their relationships to other solar and interplanetary phenomena will be noted.

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