0000000000157082

AUTHOR

Konstantin Klementiev

0000-0002-9468-4188

showing 5 related works from this author

Study of High-Temperature Behaviour of ZnO by Ab Initio Molecular Dynamics Simulations and X-ray Absorption Spectroscopy

2021

Wurtzite-type zinc oxide (w-ZnO) is a widely used material with a pronounced structural anisotropy along the c axis, which affects its lattice dynamics and represents a difficulty for its accurate description using classical models of interatomic interactions. In this study, ab initio molecular dynamics (AIMD) was employed to simulate a bulk w-ZnO phase in the NpT ensemble in the high-temperature range from 300 K to 1200 K. The results of the simulations were validated by comparison with the experimental Zn K-edge extended X-ray absorption fine structure (EXAFS) spectra and known diffraction data. AIMD NpT simulations reproduced well the thermal expansion of the lattice, and the pronounced …

TechnologyMaterials science02 engineering and technology01 natural sciencesMolecular physicsThermal expansionArticleCondensed Matter::Materials Science0103 physical sciencesAtomGeneral Materials Science010306 general physicsAnisotropyAbsorption (electromagnetic radiation)MicroscopyQC120-168.85X-ray absorption spectroscopyExtended X-ray absorption fine structureTab initio molecular dynamicsQH201-278.5Anharmonicityzinc oxideEngineering (General). Civil engineering (General)021001 nanoscience & nanotechnologyTK1-9971Molecular geometryDescriptive and experimental mechanicsZnOElectrical engineering. Electronics. Nuclear engineeringTA1-20400210 nano-technologyextended X-ray absorption fine structureMaterials
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In Situ Study of Zinc Peroxide Decomposition to Zinc Oxide by X‐Ray Absorption Spectroscopy and Reverse Monte Carlo Simulations

2022

The authors wish to thank Dr. R. Kalendarev for the synthesis of ZnO2 sample. A.K. would like to thank the financial support of the ERDF Project No. 1.1.1.1/20/A/060. The experiment at the MAX IV synchrotron was performed within the project 20190823. Institute of Solid State Physics, University of Latvia as the Center of Excellence has received funding from the European Union's Horizon 2020 Framework Programme H2020-WIDESPREAD-01-2016-2017-TeamingPhase2 under grant agreement No. 739508, project CAMART2.

Condensed Matter - Materials Sciencereverse Monte Carlo methodX-ray absorption spectroscopyMaterials Science (cond-mat.mtrl-sci)FOS: Physical sciences:NATURAL SCIENCES::Physics [Research Subject Categories]Condensed Matter PhysicsElectronic Optical and Magnetic MaterialsEXAFSCondensed Matter::Materials Sciencephase transitionZnOPhysics::Atomic and Molecular ClustersZnO2physica status solidi (b)
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Luminescence and vacuum ultraviolet excitation spectroscopy of cerium doped Gd3Ga3Al2O12 single crystalline scintillators under synchrotron radiation…

2020

Authors gratefully acknowledge the financial support from the Latvian Science Council grant LZP-2018/2-0358 . The research leading to this result has been supported by the project CALIPSO plus under the Grant Agreement 730872 from the EU Framework Programme for Research and Innovation HORIZON2020 . The work of A.P.K. was supported by the Ministry of Science and Higher Education of the Russian Federation , state contracts No. 11.6181.2017/ITR .

Materials scienceLuminescenceAnalytical chemistryGeneral Physics and Astronomychemistry.chemical_elementSynchrotron radiation02 engineering and technology01 natural sciencesIonCondensed Matter::Materials ScienceCe3+Condensed Matter::Superconductivity0103 physical sciences:NATURAL SCIENCES:Physics [Research Subject Categories]Gd3Ga3Al2O12Spectroscopy010302 applied physicsSynchrotron radiationDoping021001 nanoscience & nanotechnologyXANESlcsh:QC1-999XANES3. Good healthCeriumchemistry0210 nano-technologyLuminescenceExcitationlcsh:PhysicsVUV spectroscopyResults in Physics
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Local electronic structure rearrangements and strong anharmonicity in YH3 under pressures up to 180 GPa

2021

The authors acknowledge the ESRF program committee (Grenoble, France) for the opportunity to perform XAFS and XRD measurements. We are grateful to Prof. Dr Marek Tkacz from the Institute of Physical Chemistry, PAS Kasprzaka 44/52, 01-224 Warsaw, Poland, for high quality YH3 samples and to Dr. José A. Flores-Livas for a fruitful discussion. A.P.M. and A.A.I. acknowledge the Russian Foundation for the Basic Research (grant No 18-02-40001_mega) for financial support. J.P., A.K., and I.P. would like to thank the support of the Latvian Council of Science project No. lzp-2018/2-0353. ISSP UL acknowledge the European Union’s Horizon 2020 Framework Programme H2020-WIDESPREAD-01-20l 6-2017-TeamingPh…

Materials scienceHydrogenScienceGeneral Physics and Astronomychemistry.chemical_element02 engineering and technology01 natural sciencesGeneral Biochemistry Genetics and Molecular BiologyCondensed Matter::Materials Science0103 physical sciencesAtomPhysics::Atomic and Molecular Clusters:NATURAL SCIENCES:Physics [Research Subject Categories]Physics::Atomic PhysicsPhysics::Chemical Physics010306 general physicsMultidisciplinaryExtended X-ray absorption fine structureHydrideQAnharmonicityGeneral ChemistryYttrium021001 nanoscience & nanotechnologyXANESX-ray absorption fine structurechemistryChemical physics0210 nano-technologyNature Communications
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Exciton interaction with Ce3+ and Ce4+ ions in (LuGd)3(Ga,Al)5O12 ceramics

2021

The authors acknowledge the expert help of the staff of MAX IV Laboratory. The research leading to this result has been supported by the project CALIPSOplus under the Grant Agreement 730872 from the EU Framework Programme for Research and Innovation HORIZON 2020. I.V. acknowledges the support of Russian Foundation for Basic Research # 20-52-S52001.

Materials scienceAbsorption spectroscopyExcitonBiophysicsAnalytical chemistry02 engineering and technology010402 general chemistry01 natural sciences7. Clean energyBiochemistryCeSynchrotronTheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITYSpectroscopy:NATURAL SCIENCES::Physics [Research Subject Categories]General Chemistry021001 nanoscience & nanotechnologyCondensed Matter PhysicsAtomic and Molecular Physics and OpticsXANESXANES0104 chemical sciencesAbsorption edgeCe4+Absorption bandEnergy transferGarnet scintillatorsExcited stateExcitons0210 nano-technologyLuminescence
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