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Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 35
Hantová, Kamila , Houška, Jiří
Molecular dynamics study of the growth of ZnOx films

Crystalline zinc oxide thin films are important due to a combination of optical transparency, electrical conductivity, and piezoelectric and pyroelectric properties. These functional properties are improved with increasing perfection of the crystalline structure. In this paper, classical molecular dynamics...

Matas, Martin , Farhadizadeh, Alireza , Houška, Jiří
Vacancies and substitutional defects in multicomponent diboride Ti0.25Zr0.25Hf0.25Ta0.25B2: first-principle study

We study the hard and electrically conductive multicomponent diboride Ti0.25Zr0.25Hf0.25Ta0.25B2 with high thermal stability by ab-initio calculations. We focus on the effect of defects (either vacancies or C atoms, both relevant for numerous experiments including our own) on material characteristics....

Farhadizadeh, Alireza , Vlček, Jaroslav , Houška, Jiří , Haviar, Stanislav , Čerstvý, Radomír , Červená, Michaela
Hard and electrically conductive multicomponent diboride-based films with high thermal stability

We report high-quality, hard (31–41 GPa), crack-resistant (hardness-to-effective Young's modulus ratio of 0.13–0.16) and electrically conductive (2.8–4.2 × 10^5 S/m) HfB2 based thin-film ceramic materials with high thermal stability. We go through a wide range of compositions resulting from i...

Houška, Jiří
Maximum achievable N content in atom-by-atom growth of amorphous Si–B–C–N materials

Amorphous Si–B–C–N alloys can combine exceptional oxidation resistance up to 1500 °C with high-temperature stability of superior functional properties. Because some of these characteristics require as high N content as possible, the maximum achievable N content in amorphous Si–B–C–N is examined&#...

Batková, Šárka , Kozák, Tomáš , Haviar, Stanislav , Mareš, Pavel , Čapek, Jiří
Effect of exit-orifice diameter on Cu nanoparticles produced by gas-aggregation source

Gas-aggregation source (GAS) was used to prepare Cu nanoparticles. By changing the diameter of the exit orifice of the aggregation chamber, we were able to isolate and investigate the effect of the flow rate of the working gas at a constant pressure inside the aggregation ...

Musil, Jindřich , Čiperová, Zuzana , Čerstvý, Radomír , Kos, Šimon
Hard alloy films with enhanced resistance to cracking

The article reports on the mechanical properties of alloy films prepared by magnetron sputtering. Cracking is a great drawback of alloy films because it strongly limits many of their practical applications. It is shown that hard alloy films resistant to cracking must be superelasti...

Matas, Martin , Procházka, Michal , Vlček, Jaroslav , Houška, Jiří
Dependence of characteristics of Hf(M)SiBCN (M = Y, Ho, Ta, Mo) thin films on the M choice: Ab-initio and experimental study

Self-formation of a unique dual glassy-crystalline structure in binary W–Zr system was observed for a film with 28 at.% Zr prepared by magnetron co-sputtering. The film is composed of conical columnar domains of α-W(Zr) solid solution structure surrounded by featureless areas corresponding&#...

Zeman, Petr , Haviar, Stanislav , Červená, Michaela
Self-formation of dual glassy-crystalline structure in magnetron sputtered W–Zr films

The influence of different concentrations (0.5, 1.0, and 2.0 wt.%) of Zinc Oxide (ZnO) filleron the dielectric properties of the cold-curing polyurethane (PU) resin is presented in this study. Forthis purpose, the direct DC conductivity and the broadband dielectric spectroscopy measurementswere&#...

Červená, Michaela , Zeman, Petr , Houška, Jiří , Šímová, Veronika , Procházka, Michal , Čerstvý, Radomír , Haviar, Stanislav , Vlček, Jaroslav
Enhancement of high-temperature oxidation resistance and thermal stability of hard and optically transparent Hf–B–Si–C–N films by Y or Ho addition

Hard and optically transparent amorphous Hf7B10Si32C2N44, Hf6B12Si29Y2C2N45 and Hf5B13Si25Ho3C2N48 films were prepared and examined for the oxidation resistance in air and thermal stability in inert gasses up to 1600 °C. A thermal evolution of their structure, hardness and optical properties was&...

Bárta, Tomáš , Vlček, Jaroslav , Houška, Jiří , Haviar, Stanislav , Čerstvý, Radomír , Szelwicka, Jolanta , Fahland, Matthias , Fahlteich, John
Pulsed Magnetron Sputtering of Strongly Thermochromic VO2-Based Coatings with a Transition Temperature of 22 °C onto Ultrathin Flexible Glass

The reversible semiconductor-to-metal transition of vanadium dioxide (VO2) makes VO2-based coatings a promising candidate for thermochromic smart windows, reducing the energy consumption of buildings. This paper deals with maximizing the application potential of these coatings in terms of their perfor...

Shen, Yi , Jiang, Jiechao , Zeman, Petr , Červená, Michaela , Šímová, Veronika , Vlček, Jaroslav , Meletis, Efstathios I.
Microstructure of High Temperature Oxidation Resistant Hf6B10Si31C2N50 and Hf7B10Si32C2N44 Films

High-temperature oxidation resistant amorphous Hf6B10Si31C2N50 and Hf7B10Si32C2N44 films were deposited by reactive pulsed dc magnetron sputtering. To investigate the oxidation mechanism, the films were annealed up to 1500 °C in air. The evolved microstructures were studied by X-ray diffraction and&#x...

Procházka, Michal , Vlček, Jaroslav , Houška, Jiří , Haviar, Stanislav , Čerstvý, Radomír , Veltruská, Kateřina
Multifunctional MoOx and MoOxNy films with 2.5 < x < 3.0 and y < 0.2 prepared using controlled reactive deep oscillation magnetron sputtering

Reactive deep oscillation magnetron sputtering with a pulsed reactive gas flow control and to-substrate reactive gas injection into the high-density plasma in front of the sputtered Mo target was used for a low-temperature (< 120 °C) preparation of MoOx and MoOxNy films with 2.5...

Kumar, Nirmal , Haviar, Stanislav , Rezek, Jiří , Baroch, Pavel , Zeman, Petr
Tuning Stoichiometry and Structure of Pd-WO3−x Thin Films for Hydrogen Gas Sensing by High-Power Impulse Magnetron Sputtering

By tuning the deposition parameters of reactive high-power impulse magnetron sputtering, specifically the pulse length, we were able to prepare WO3−x films with various stoichiometry and structure. Subsequently, the films were annealed in air at moderate temperature (350 °C). We demonstrate ...

Kumar, Nirmal , Čapek, Jiří , Haviar, Stanislav
Nanostructured CuWO4/WO3-x films prepared by reactive magnetron sputtering for hydrogen sensing

High-purity films consisting of copper tungstate (CuWO4) and sub-stoichiometric tungsten oxide (WO3-x) were prepared by reactive sputter deposition. An original two-step deposition process was applied for their synthesis. First, a tungsten oxide thin film was deposited by dc magnetron sputtering ...

Kolenatý, David , Vlček, Jaroslav , Bárta, Tomáš , Rezek, Jiří , Houška, Jiří , Haviar, Stanislav
High‑performance thermochromic VO2‑based coatings with a low transition temperature deposited on glass by a scalable technique

We report on high-performance thermochromic ZrO2/V0.982W0.018O2/ZrO2 coatings with a low transition temperature prepared on glass by a low-temperature scalable deposition technique. The V0.982W0.018O2 layers were deposited by a controlled high-power impulse magnetron sputtering of V target, combined w...

Zeman, Petr , Zuzjaková, Šárka , Čerstvý, Radomír , Houška, Jiří , Shen, Yi , Todt, Juraj , Jiang, Jiechao , Daniel, Rostislav , Keckes, Jozef , Meletis, Efstathios I. , Vlček, Jaroslav
Extraordinary high-temperature behavior of electrically conductive Hf7B23Si22C6N40 ceramic film

The high-temperature behavior of an electrically conductive, opaque and hard Hf7B23Si22C6N40 ceramic film with an amorphous structure was systematically investigated in air up to 1700 °C and inert gases up to 1600 °C. The film was prepared by reactive pulsed dc magnetron sputter de...

Batková, Šárka , Čapek, Jiří , Rezek, Jiří , Čerstvý, Radomír , Zeman, Petr
Effect of positive pulse voltage in bipolar reactive HiPIMS on crystal structure, microstructure and mechanical properties of CrN films

CrN films were prepared using three different configurations of the HiPIMS discharge mode and the substrate holder potential. We investigate the effect of a positive pulse voltage (30–400 V) in bipolar HiPIMS on the crystal structure, microstructure and resulting mechanical properties of...

Choukourov, Andrei , Melnichuk, Iurii , Gordeev, Ivan , Nikitin, Daniil , Tafiichuk, Renata , Pleskunov, Pavel , Hanuš, Jan , Houška, Jiří , Kretková, Tereza , Dopita, Milan
Self-organization of vapor-deposited polyolefins at the solid/vacuum interface

Interactions between polyolefins and silicon substrates are investigated upon their physical vapor deposition under vacuum. Molecular dynamics simulations show that polyolefins unfold upon adsorption and that two macromolecules suffice to produce a stable nucleus. Supersharp probe AFM measurements reveal&#...

Houška, Jiří , Kozák, Tomáš
Distribution of O atoms on partially oxidized metal targets, and the consequences for reactive sputtering of individual metal oxides

Čapek, Jiří , Batková, Šárka , Matas, Martin , Kos, Šimon , Kozák, Tomáš , Haviar, Stanislav , Houška, Jiří , Schusser, Jakub , Minár, Jan , Dvořák, Filip , Zeman, Petr
Bixbyite-Ta2N2O film prepared by HiPIMS and postdeposition annealing: Structure and properties

Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 35