A5015573559- Phase-change materials and chalcogenides
- Polyoxometalates: Synthesis and Applications
- Chemical Synthesis and Characterization
- Catalysis and Oxidation Reactions
- Chalcogenide Semiconductor Thin Films
- Glass properties and applications
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Advanced Thermoelectric Materials and Devices
- Transition Metal Oxide Nanomaterials
- Radioactive element chemistry and processing
- Inorganic Chemistry and Materials
- Luminescence Properties of Advanced Materials
- Solid-state spectroscopy and crystallography
- Vanadium and Halogenation Chemistry
- Catalytic Processes in Materials Science
- Crystal Structures and Properties
- Layered Double Hydroxides Synthesis and Applications
- Thermal and Kinetic Analysis
- Organometallic Compounds Synthesis and Characterization
- Quantum Dots Synthesis And Properties
- Pigment Synthesis and Properties
- Topological Materials and Phenomena
- Synthesis and characterization of novel inorganic/organometallic compounds
- Heusler alloys: electronic and magnetic properties
University of Pardubice
2015-2024
Czech Academy of Sciences, Institute of Macromolecular Chemistry
2008-2017
Czech Academy of Sciences
1993-2015
O2 Czech Republic (Czechia)
2014
University of South Bohemia in České Budějovice
2009
Brno University of Technology
1997
Institute of Chemical Technology
1982-1993
We studied the optical properties of as-prepared (amorphous) and thermally crystallized (fcc) flash evaporated Ge2Sb2Te5 thin films using variable angle spectroscopic ellipsometry in photon energy range 0.54–4.13 eV. employed Tauc–Lorentz (TL) model Cody–Lorentz (CL) for amorphous phase TL with one additional Gaussian oscillator fcc data analysis. The has bandgap Egopt=0.65 eV or 0.63 slightly dependent on used model. Urbach edge film was found to be ∼70 meV. Both models behave very...
The authors demonstrate, in this work, a fascinating synergism of high surface area heterojunction between TiO 2 the form ordered 1D anodic nanotube layers aspect ratio and ZnO coatings different thicknesses, produced by atomic layer deposition. effectively passivate defects within walls significantly improve their charge carrier separation. Upon ultraviolet visible light irradiation, with an increase coating thickness from 0.19 to 19 nm external potential 0.4–2 V, yields up 8‐fold...
We report on a very significant enhancement of the thermal, chemical, and mechanical stability self-organized TiO2 nanotubes layers, provided by thin Al2O3 coatings different thicknesses prepared atomic layer deposition (ALD). nanotube layers coated with exhibit significantly improved thermal as illustrated preservation nanotubular structure upon annealing treatment at high temperatures (870 °C). In addition, anatase content is preserved in against expectation total rutile conversion such...
Abstract A systematic study of the doping ability TeO 2 –ZnO–BaO glassy system with Er 3+ ions is presented to achieve strong Stokes/upconversion photoluminescence (UPL) emission and determine optimal experimental conditions for conducting Judd–Ofelt (JO) analysis in Er-doped materials using newly introduced Combinatorial JO this work. Selected samples across glass-forming region following concentration trends each constituent oxide were uniformly doped 0.2 mol. <mml:math...
Indexed X-ray powder diffraction data are reported for the low temperature tetragonal ZrO 2 obtained by crystallization of zirconia gel. The structure was refined Rietveld technique on basis space group P 4 / nmc . Refined unit cell dimensions a = 3.5984(5) Å, c 5.152(1) V 66.71 Å 3 , D x =6.135 g cm F 18 =62 (0.012, 24), R =8.99, wp =11.48, B =3.13.
Three push–pull aminopyridine derivatives having D–π–A, D–(π–A)<sub>2</sub>, and D–(π–A)<sub>3</sub> arrangements were examined as model organic chromophores capable of intercalation into inorganic layered materials.
The development of intrinsic vacancies in SnSe single crystals was investigated as a function annealing temperature by means positron annihilation spectroscopy accompanied transport measurements. It has been demonstrated that two types are present single-crystalline SnSe. While Sn dominate the low-temperature region, Se and vacancy clusters govern high-temperature region. These findings supported theoretical calculations enabling direct detection quantification most favorable type vacancies....
Abstract The single crystals of the ternary system based on Bi 2‐x Tl x Se 3 (nominaly = 0.0‐0.1) were prepared using Bridgman technique. Samples with varying content characterized by measurement lattice parameters, electrical conductivity σ ⊥ c , Hall coefficient R H ( B∥c ), and Seebeck S (Δ T ). measurements indicate that incorporating in 2 one lowers concentration free electrons enhances their mobility. This effect is explained terms point defects crystal – formation substitutional...
The organoantimony(III) and organobismuth(III) sulfides (LMS)2 (L = NCN chelating ligand, C6H3-2,6-(CH2NMe2)2; M Sb (1), Bi (2)) are dimeric in the solid state. Nevertheless, their monomeric structures with terminal Sb−S Bi−S bonds present solution were trapped by [2 + 2] cycloaddition reactions CS2, giving molecular trithiocarbonates LMS2C═S (M (3), (4)). Both compounds characterized state X-ray diffraction techniques on both single crystals powder material IR spectroscopy. Carbon disulfide...
The direct reaction of liquid (or melted solid) 1-alkanols or 1,ω-alkanediols with solid finely ground VOPO4· 2H2O in a microwave field leads to layered complexes the composition VOPO4·2CnH2n+1OH (n = 1−18) VOPO4·CnH2n(OH)2 2−10), respectively. results X-ray diffraction analysis show that structures all these polycrystalline (intercalates) retain original layers (VOPO4)∞. molecules alcohols are placed between host bimolecular way, being anchored them by donor−acceptor bonds oxygen atom an OH...
Three new calcium phenylphosphonates, CaC6H5PO3·2H2O, Ca3(C6H5PO3H)2(C6H5PO3)2·4H2O, and CaC6H5PO3·H2O, two 4-carboxyphenylphosphonates, Ca(HOOCC6H4PO3H)2 Ca3(OOCC6H4PO3)2·6H2O, were prepared. It was found that CaC6H5PO3·2H2O transformed into previously known Ca(C6H5PO3H)2 via Ca3(C6H5PO3H)2(C6H5PO3)2·4H2O in the presence of phenylphosphonic acid, vice versa, turned a weak basic medium. A similar relationship between Ca3(OOCC6H4PO3)2·6H2O; i.e., Ca3(OOCC6H4PO3)2·6H2O...
Abstract Single crystals of Sb2-xInxTe3 (x = 0·0−0·4), Bi2-xInxTe3 0·0−0·4) and Bi2Te3-x 0·0−0·1) prepared using a modified Bridgman method have had their lattice parameters, electrical conductivity Hall coefficient determined. The concentration free current carriers (holes), as calculated from the coefficient, in has been found to decrease with increasing In content, while Bi2Te3-xSx decreases S content. observed effect is explained terms an increase polarization bonds caused by...
The redox reaction of distannyne 1 with S8 allowed the synthesis organotin(II) sulfide [({2,6-(Me2NCH2)2C6H3}Sn)2S] (2) in first step oxidation. second afforded isolation heptathiadistannabicyclo[1.1.5]nonane [({2,6-(Me2NCH2)2C6H3}Sn(μ-S))2(μ-S5)] (3)—a new organotin(IV) polysulfide.