A5102015672- Crystallization and Solubility Studies
- X-ray Diffraction in Crystallography
- Solid-state spectroscopy and crystallography
- Nuclear materials and radiation effects
- Nuclear Materials and Properties
- High-pressure geophysics and materials
- Crystal Structures and Properties
- Microbial Natural Products and Biosynthesis
- Radioactive element chemistry and processing
- Marine Sponges and Natural Products
- Heusler alloys: electronic and magnetic properties
- Glass properties and applications
- Magnetic Properties of Alloys
- thermodynamics and calorimetric analyses
- Boron and Carbon Nanomaterials Research
- Electronic and Structural Properties of Oxides
- Chemical synthesis and alkaloids
- Chemical and Physical Properties in Aqueous Solutions
- MXene and MAX Phase Materials
- nanoparticles nucleation surface interactions
- Ferroelectric and Piezoelectric Materials
- Magneto-Optical Properties and Applications
- Solidification and crystal growth phenomena
- Fungal Biology and Applications
- Thermal and Kinetic Analysis
Argonne National Laboratory
2023-2025
Carnegie Institution for Science
2014-2018
Geophysical Laboratory
2014-2018
Alexandria University
2007
European Science Foundation
2007
Russian Academy of Sciences
2005
Far Eastern Branch of the Russian Academy of Sciences
2002-2004
Institute of Chemistry, Far Eastern Branch of the Russian Academy of Sciences
2002-2004
Pacific Institute of Bioorganic Chemistry. GB Elyakova Far Eastern Branch of the Russian Academy of Sciences
2000-2002
Laboratoire de physique des Solides
1978-1982
Energetic radiation can cause dramatic changes in the physical and chemical properties of actinide materials, degrading their performance fission-based energy systems. As advanced nuclear fuels wasteforms are developed, fundamental understanding processes controlling damage accumulation is necessary. Here we report oxidation state reduction analogue elements caused by high-energy, heavy ion irradiation demonstrate coupling this redox behaviour with structural modifications. ThO2, which...
Vanadium diboride (VB2) with an AlB2-type structure has been synthesized at 8 GPa and 1700 K in a D-DIA-type multianvil apparatus. The obtained bulk modulus is B0 = 262(2) fixed B′ 4.0 for VB2 via high-pressure X-ray diffraction measurements. Meanwhile, also demonstrated to possess high Vickers hardness of 27.2 ± 1.5 GPa, thermal stability 1410 air, among the highest transition-metal borides, extremely low resistivity value (41 μΩ cm) room temperature. Results from first-principles...
The rare gas solids exhibit systematic differences in crystal structure, phase transition conditions, bond strength, and other physical properties. properties of heavy krypton xenon are modified by the martensitic from face-centered cubic to hexagonal close packed structure over a broad pressure range. Crystal plastic deformation have been investigated at 300 K using compression diamond-anvil cell with synchrotron angle-dispersive x-ray diffraction complementary ruby fluorescence...
Hydrothermal diamond anvil cells (HDACs) provide facile means for coupling synchrotron X-ray techniques with pressure up to 10 GPa and temperature 1300 K. This manuscript reports on an application of the HDAC as ambient-pressure sample environment performing in situ defect annealing thermal expansion studies swift heavy ion irradiated CeO 2 ThO using diffraction. The advantages technique over conventional methods include rapid ramping quench times, high-resolution measurement capability,...
Abstract Intermediate members of the grossular–andradite and grossular–uvarovite series are known to display anomalous birefringence, which is inconsistent with ideal cubic space group garnet Ia d . To determine reason for such crystal structures at least 15 samples were refined by different authors including present ones. The crystals value birefringence Δ n > 0.001 normally characterized partial ordering octahedral cations (Al/Fe Al/Cr series, respectively). This reduces symmetry...
Pressure-induced phase transitions from the zircon structure-type (I41/amd) to scheelite structure type (I41/a) are known for many ternary oxides systems (ABO4). In this work, we present first high-pressure study on synthetic stetindite (CeSiO4) by a combination of in situ synchrotron powder X-ray diffraction up 36 GPa, implemented with and without dual sided laser heating, Raman spectroscopy 43 GPa. Two were identified: low-symmetry (HPLS) at 15 GPa then 18 The latter HPLS was found...
Abstract The origin of anomalous birefringence in grossular-andradite (grandite) garnets is considered. Using the point-dipole model we have calculated optical indicatrix for four crystals (three from paper by Takéuchi et al . (1982) and one studied previously present authors). good agreement with observed one. This suggests that grandite due to Al/Fe ordering. Interrelations between indicatrix, structure growing face, site occupancy crystal suggest a growth Fe/Al ordering confirm...
Abstract Kinetic ordering of the cations in (Sr,Pb)(NO 3 ) 2 and (Ba,Pb)(NO solid solutions with anomalous birefringence was studied by means single crystal X-ray diffraction. The structures two samples (Sr 0.62 Pb 0.38 )(NO (Ba 0.20 0.80 , respectively, taken from {111} growth sectors as well (NO {100} sector were refined ideal structure space group Pa -3 its subgroups – trigonal R triclinic P -1 = 0.009 — 0.027. final choice symmetry for is based on analysis diffraction patterns cation...
Recent band structure calculations have suggested the potential for tuning in a chiral semi-conductor, Ag$_3$AuTe$_2$, to zero upon application of negative strain. In this study, we report on synthesis polycrystalline Ag$_3$AuTe$_2$ and investigate its transport, optical properties, pressure compatibility. Transport measurements reveal semiconducting behavior with high resistivity an activation energy $E_a$ 0.2 eV. The gap determined by diffuse reflectance is about three times wider than...
Significant grain growth is observed during the high-pressure phase transformations (PTs) at room temperature within an hour for various materials. However, no existing theory explains this phenomenon since nanocrystals do not grow even over a time span of several years because slow diffusion. Here, we suggest multistep mechanism $\alpha\rightarrow\omega$ PT in Zr. Phase interfaces and boundaries (GBs) coincide move together under action combined thermodynamic driving forces. Several...
Keyword 1 : proteolysis, crystal structure, proteasome Protein degradation is an essential and strictly controlled process with functionally related proteases representing its central part.Tricorn protease (TRI) has been shown to act downstream of the proteasome, degrading produced peptides.Recently, a novel large prokaryotic aminopeptidase oligomeric complex, named TET, identified.This complex degrades peptides different length in organisms where TRI not present.We determined structure TET...
Abstract For see ChemInform in Full Text.
Pressure-induced phase transitions in single-crystal PbZr0.54Ti0.46O3 are investigated with high-pressure Raman scattering and x-ray single crystal powder diffraction. The appearance of a peak near 380 cm−1 indicates structural transition at 3 GPa. A second transition, driven by an soft optical phonon, occurs 9 third above 27 GPa, accompanied large changes the spectrum splitting (pseudo-cubic) (111) (220) diffraction lines. We identify as monoclinic (Cm) to rhombohedral (R3m) followed (R-3c)...