Conveners
X-ray structural analysis: Oral 3
- Marat Sharafutdinov ()
- Boris Tolochko ()
The I12 Joint Engineering, Environmental and Processing (JEEP) beamline, was constructed during Phase II of the Diamond Light Source. The beamline started operating in November 2009. It is located on a short (5 m) straight section of the 3 GeV Diamond storage ring. The insertion device is a 4.2 T superconducting multipole wiggler. User experiments are possible with filtered white beam or...
The studies of the structure, phase composition and phase transformation of functional materials such as catalysts, sorbents, ion conductors, coatings, etc. are performed at Beamlines No.2 and No.6 of VEPP-3 and No.8 of VEPP-4M electron storage rings at Siberian Synchrotron and Terahertz Radiation Centre. The Beamline No.2 is dedicated to high resolution X-ray powder diffraction experiments;...
Laser welding is one of the most promising methods in comparison with other methods of welding dissimilar materials. This method does not require the use of additional materials, special edge processing, and also has a high welding speed. The aim of the work was to study the phase composition and morphology of various zones of the welded joint between alloys based on aluminum and titanium. ....
In the context of the global H2O cycle, an active interest is taken in water recycling associated with subduction of oceanic plates into the mantle. Mineral serpentine, Mg3Si2O5(OH)4, is regarded as the main water reservoir in oceanic litosphere [1], and therefore its dehydration can produce a large impact onto seismic activity and magma generation in subduction zones. Since the dehydration...
The elaboration of catalytic materials is related to abilities to effectively probe nano-scale structures. There is significant drawback to common XRD methods addressed to well-crystallized materials, since catalyst components are often highly dispersed and present at low concentrations. The Pair Distribution Function (PDF) analysis based on operating with total scattering data is one of the...
At present different agents are developing for diagnostics and treatment of cancer - one of the main reasons of human deaths. Especially perspective examples are aptamers - single-stranded DNA or RNA molecules which are compact analogs of the antibodies with low immune response, have a short length (10-100 nucleotides), well-defined spatial structure and surface charge distribution providing...
Ultrafine grained Au-Co alloys were prepared by high pressure torsion (HPT) technique. The severe plastic deformation was carried out at room and cryogenic temperatures. A consolidated alloy is formed from the initial powder mixture of metals in an equiatom ratio after mechanical alloying. Then, synchrotron radiation diffractometry of the obtained samples was carried out. It was found that...
Recent extensive research on high-temperature superconductivity in compressed binary hydrogen-rich compounds generat-ed a large corpus of phase stability calculations with an evident lack of their experimental verification. Pt-H system at high pressure represent a typical example of inconsistency between computational approach, which predicted stability of eight PtH structures, and experiments...
Alumina containing systems are of great significance for catalysis due to the unique properties of this oxide. These systems usually exist in nanoscale state. Their composition and physicochemical properties depend on the preparation conditions. The appearance of novel methods of alumina synthesis give a new stimulus to the study of their structure and properties. Therefore such substances are...
The reducibility of oxides is an essential characteristic of catalyst of different reactions. First of all, it is important for oxidation reactions following the Mars-van Krevelen mechanism. In this mechanism, a weakly bound surface oxygen atom is added to forming the oxygenated compound, leaving behind an oxygen vacancy on the surface. Then, the molecular oxygen react with the surface,...
Here we present our latest achievements regards diamond single crystal growth and characterization by means of X-ray diffraction. Synthetic diamond crystals were grown by the temperature gradient method using a high-pressure apparatus of the ‘‘split sphere’’ type (BARS) at P=5.7 GPa and T=1550 °C with the use of a Ni0.7Fe0.3 alloy as a solvent-catalyst. It has been shown that dislocation-free...
